Laser processing and manufacturing has become one of the most convenient and enabling technologies for manufacturing as well as other related industries such as automobile, railway, shipbuilding, aerospace, microelectronics, photonics, biomedical, and energy. It offers unprecedented versatility and range in terms of feature size, material, phase, and processing options. During the last decade there have been significant advances on laser processing and manufacturing research and development including laser additive manufacturing, laser welding, laser drilling, laser cutting, laser peening, laser cleaning, laser surface texturing, laser nanofabrication, etc. The primary goal of this conference is to provide a platform for professionals to share and discuss the latest advances in laser processing and manufacturing. The solicited exemplary topics include, but are not limited to: ;
In progress – view active session
Conference 11892

Advanced Laser Processing and Manufacturing V

In person: 11 - 12 October 2021
On demand starting 10 October 2021
View Session ∨
  • 1: Laser Cladding/Surface Modification and Additive Manufacturing I
  • 2: Laser Cladding/Surface Modification and Additive Manufacturing II
  • Poster Session
  • 3: Laser Cladding/Surface Modification and Additive Manufacturing III
  • 4: Laser Welding/Joining and Laser Peening I
  • 5: Laser Welding/Joining and Laser Peening II
  • 6: Laser Micro-/Nanofabrication and Ultrafast Laser Processing
2021-09-17T22:29:18-07:00
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UPCOMING LIVE EVENTS:
Session 1: Laser Cladding/Surface Modification and Additive Manufacturing I
In person: 11 October 2021 • 08:00 - 10:00 China Standard Time
Session Chair: Zhehe Yao, Zhejiang Univ. of Technology (China)
11892-1
Author(s): Jing Chen, Northwestern Polytechnical Univ. (China)
In person: 11 October 2021 • 08:00 - 08:30 China Standard Time
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Author(s): Di Zhang, Central Research Institute of Building and Construction Co., Ltd. of the MCC Group (China); Aobo Liu, Bangzhao Yin, Peng Wen, Tsinghua Univ. (China)
In person: 11 October 2021 • 08:30 - 08:50 China Standard Time
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Duplex stainless steels (DSSs) have the microstructure consisting of austenite and ferrite, and the ratio of two phases is roughly 1:1. The balanced two-phase microstructure achieves excellent mechanical properties and high corrosion resistance of DSSs. As a revolutionary manufacturing method, additive manufacturing (AM) has been applied to the fabrication of DSSs. Among all AM methods, direct energy deposition (DED) has been widely reported to produce DSSs in recent 5 years. Currently, laser metal deposition (LMD, namely DED laser) and wire arc additive manufacturing (WAAM, namely DED arc) are the most commonly used DED methods to produced DSSs. In this paper, LMD and WAAM were used to produce super DSS 2594. The influence of two methods on the formation quality and microstructure evolution was investigated. The effect of heat sources on the microstructure was analyzed. Due to the different cooling rates during solidification, the LMD and WAAM DSSs showed different content of ferrite phase and secondary phases, resulting in the difference of mechanical properties and corrosion resistance. It was concluded that the cooling rate in the range 1200 ~ 800 °C (t12/8) should be slow to generate enough austenite from the primary ferrite, and should be rapid in the range 800 ~ 500 °C (t8/5) to inhibit the formation of harmful precipitates. The mechanical properties and corrosion resistance of LMD and WAAM DSSs were systematically investigated.
11892-3
Author(s): Junwei Wang, Dingyong He, Xu Wu, Xingye Guo, Zhen Tan, Zheng Zhou, Wei Shao, Beijing Univ. of Technology (China)
In person: 11 October 2021 • 08:50 - 09:10 China Standard Time
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Author(s): Zuo Li, Northwestern Polytechnical Univ. (China)
In person: 11 October 2021 • 09:10 - 09:30 China Standard Time
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Author(s): Jianhua Yao, Wu Guolong, Wang Ye, Zhejiang Univ. of Technology (China)
In person: 11 October 2021 • 09:30 - 10:00 China Standard Time
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The composite coating technology of micro-arc oxidation (MAO) combining with other surface modification technology has its new performance characteristics compared with its single MAO treatment. The recent developments on the composite MAO treatment of titanium alloy combined with selective laser melting (SLM) or laser surface pretreatment, are introduced in this study.
Break
Tea/Coffee Break 10:00 - 10:30
Session 2: Laser Cladding/Surface Modification and Additive Manufacturing II
In person: 11 October 2021 • 10:30 - 12:00 China Standard Time
Session Chair: Yue Zhao, Tsinghua Univ. (China)
11892-6
Author(s): Zhehe Yao, Jian Chen, Zhen Wang, Zhenqiang Sun, Jianhua Yao, Zhejiang Univ. of Technology (China)
In person: 11 October 2021 • 10:30 - 11:00 China Standard Time
11892-7
Author(s): Yufan Liu, Zifa Xu, Wentai Ouyang, Ningbo Institute of Materials Technology and Engineering (China); Junke Jiao, Yangzhou Univ. (China); Mina Zhang, Qi Zou, Wenwu Zhang, Ningbo Institute of Materials Technology and Engineering (China)
In person: 11 October 2021 • 11:00 - 11:20 China Standard Time
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In this study, the Inconel718 superalloy was taken as the research object to study the laser hybrid additive and subtractive manufacturing. The effects of substrate temperature and laser parameters on the surface quality of Inconel 718 AM component were studied during the hybrid additive and subtractive manufacturing. The laser milling and polishing processes of AM components at different cooling temperatures was studied, and the influence of parameters on the surface roughness, surface morphology, microstructure and hardness were explored.
11892-8
Author(s): Siyu Zhang, Northwestern Polytechnical Univ. (China)
In person: 11 October 2021 • 11:20 - 11:40 China Standard Time
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Laser solid forming (LSF) Ti5Al2Sn2Zr4Mo4Cr titanium alloy usually exhibits brittle fracture with a poor elongation when the tensile direction is perpendicular to the growth direction of columnar β grains. In the present study, the effect of powder feed rate on the columnar to equiaxed transition (CET) and grain refinement of Ti5Al2Sn2Zr4Mo4Cr titanium alloy during the LSF process was investigated. The results showed that increasing in powder feed rate could effectively promote CET during LSF process. The pauses of the LSF process aimed to obtain equiaxed β grains also lead to the precipitation of very fine α laths inside the β grains since the heat accumulation was avoided. The microstructure containing equiaxed β grains and homogeneous α laths was obtained after heat treatment. The tensile properties, especially the ductility, were significantly improved compared to that in the previous studies. It is partly because the equiaxed β grains effectively prevented the crack propagation.
11892-9
Author(s): Can Wang, Li Cui, Dingyong He, Beijing Univ. of Technology (China); Qing Cao, Jiangsu Spray Technology Co., Ltd. (China)
In person: 11 October 2021 • 11:40 - 12:00 China Standard Time
Break
Lunch Break 12:00 - 13:30
Poster Session
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
Conference attendees are invited to attend the poster session on Monday afternoon. Come view the posters, ask questions, and network with colleagues in your field. Authors of poster papers will be present to answer questions concerning their papers. Attendees are required to wear their conference registration badges to the poster session.

Poster Setup: Monday 10:00 to 13:00
View poster presentation guidelines and set-up instructions at
https://spie.org/PA/poster-presentation-instructions
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Author(s): Zifa Xu, CNITECH (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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Author(s): Xuping Wu, Dongyun Zhang, Ziming Kang, Tingting Huang, Xingtao Feng, Beijing Univ. of Technology (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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In this paper, Ti6Al4V/AlSi10Mg multi-material specimens were fabricated by selective laser melting (SLM). The influence of process parameters on the interfacial crack was discussed and the formation mechanism of interfacial crack under different process parameters was expounded through the simulation of temperature fields. The microstructure, element distribution, phase composition and microhardness of the Ti/Al interface were investigated. The temperature gradient increased with the increase of laser power and scanning speed, which easily led to the interfacial crack. Using chess scanning strategy and increasing the preheating temperature of the substrate could effectively reduce the residual stress and avoid the interfacial crack. There was a good metallurgical bonding between titanium alloy and aluminum alloy. The results of SEM and EDS showed that the thickness of IMCs was 2µm, and the composition was mainly TiAl and TiAl3. XRD result showed that there was also TiSi2 ceramic phase
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Author(s): Jiahao Zeng, Xianlin Song, Nanchang Univ. (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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We proposed a simulation model to study the interaction between laser and brain tissue based on COMSOL. The laser point source is located in the middle of the layer of water above the brain tissue and irradiates the brain tissue. The propagation of light in the brain tissue was simulated by solving the diffusion equation. And the temperature changes of gray matter and blood vessel were achieved by solving the biological heat transfer equation. The simulation results show that the remaining light energy of the blood vessel in the cerebral cortex is ~ 85.8% of the remaining light energy in the surrounding gray matter, and the temperature of blood vessel is 0.15 K higher than that of gray matter, and the temperature of gray matter hardly changes. This research has certain theoretical guiding for the optical imaging of the brain.
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Author(s): Linyu Yan, Dong Yang, Peking Univ. (China); Qihuang Gong, Yan Li, Peking Univ. (China), Peking Univ. Yangtze Delta Institute of Optoelectronics (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
11892-37
Author(s): Haoran Li, JianGuo Xin, Junli Ma, Ping Fang, Beijing Institute of Technology (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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Laser cleaning has become a widely used cleaning technology in recent years. Currently, researchers are mainly engaged in the studies of laser cleaning process parameters. However, when the casing of oil tanks, wind turbines, and electronic equipment are cleaned, the high temperature generated by thermal deposition in the substrates will accelerate the aging of oil, reduce the performance of lubricants, and cause the damage of semiconductor devices. These will indirectly lead to mechanical or electronic failures of the devices and systems. To avoid these adverse effects, it is significant to investigate the temperature distribution of the substrate during the laser cleaning process. In this paper, the results of the temperature distribution measurement of the substrates covered with the rust, cooking oil, industrial lubricants and industrial primer has been presented.
11892-38
Author(s): Hongyu Quan, Ningbo Institute of Materials Technology and Engineering (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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Author(s): Hua Liu, Luoyang Electro-optical Equipment Research Institute (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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This method makes effective use of the neural network in learning and memory function, by after training with samples. Moreover, the neural network can learn the nonlinear relationship in the stereoscopic vision system and the internal and external orientation elements of the core optoelectronics, and can control the store by establishing the database. Compared with the traditional system construction, the method overcomes the complexity of the large amount of computation and so on. In the aspects of core optical system design and algorithm implementation, these considerations are Worthy of attention,which includes limited constraints,the scientific of critical group, the operating speed and the operability in technical aspects. The results support our theoretical forecast.
11892-40
Author(s): You Wang, Southwest Institute of Technical Physics (China); Hao Xing, Southwest Institute of Technical Physics (China), Univ. of Electronic Science and Technology of China (China); Weijiang Wang, Ruina Fang, Southwest Institute of Technical Physics (China); Yun Huang, Yunru Fan, Univ. of Electronic Science and Technology of China (China); Ying Zhang, Southwest Institute of Technical Physics (China); Chaoqun Ma, Southwest Institute of Technical Physics (China), Univ. of Electronic Science and Technology of China (China); Shiheng Zhang, Univ. of Electronic Science and Technology of China (China); Jiao Yang, Qing Luo, Jieping Luo, Southwest Institute of Technical Physics (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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Laser drilling has been more and more widely used in laser machining process. Therefore, optimizing the quality of laser drilling becomes extremely important. We know that laser drilling can be achieved by using high power density of a laser. As light waves with different waveforms represent the different energy distributions in time domain, we believe that the quality of laser drilling should be related to the laser waveform. At present, a laser used in the laser processing usually has the waveform with a Gaussian or a Lorentzian distribution. In this study, we numerically simulated the punching quality of a pulsed laser with the Gaussian distribution and a pulsed laser with the top-flat distribution (we called it as a square wave laser) at the same energy. It mainly refers to the changes of density, temperature, and pressure of the target materials under the same energy for different waveforms. The constrained interpolation profile algorithm has been used to simulate the machining pr
11892-41
Author(s): You Wang, Southwest Institute of Technical Physics (China); Yun Huang, Univ. of Electronic Science and Technology of China (China); Hao Xing, Univ. of Electronic Science and Technology of China (China), Southwest Institute of Technical Physics (China); Jiao Yang, Southwest Institute of Technical Physics (China); Yunru Fan, Univ. of Electronic Science and Technology of China (China); Ruina Fang, Weijiang Wang, Southwest Institute of Technical Physics (China); Shiheng Zhang, Univ. of Electronic Science and Technology of China (China); Chaoqun Ma, Univ. of Electronic Science and Technology of China (China), Southwest Institute of Technical Physics (China); Ying Zhang, Qing Luo, Southwest Institute of Technical Physics (China); Qiang Zhou, Guangwei Deng, Univ. of Electronic Science and Technology of China (China); Hai-Zhi Song, Univ. of Electronic Science and Technology of China (China), Southwest Institute of Technical Physics (China)
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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Laser processing plays a key role in treating a lot of materials. The mechanism of laser stealth dicing (SD) is based on irradiation of a laser beam which is focused inside the brittle material. The laser beam scans along the predetermined path, so that the characteristics of the interior brittle material can be changed, the stress layer can be therefore formed. Finally, an external force is applied to separate the brittle material. Since only the limited interior region of a wafer is processed by the laser irradiation, the damages and debris contaminants can be avoided during the SD process.SD has the advantages of a high speed for thinner wafers without any chipping, the smooth section without dust and slag, and completely dry process, ect., which has been widely used in large scale integrated circuits and microelectronic manufacturing systems. However, further studies on the simulation analyse and parameter optimization have kept to be rear for SD so far. In this study, an approach
11892-42
Author(s): Chengkai Xia, ILWOL ROAD (Korea, Republic of)
On demand starting 10 October 2021
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Author(s): Paweł E. Kozioł, Piotr Jaworski, Karol Krzempek, Viktoria Hoppe, Grzegorz Dudzik, Wroclaw Univ. of Science and Technology (Poland); Fei Yu, Dakun Wu, Meisong Liao, Shanghai Institute of Optics and Fine Mechanics (China); Krzysztof Abramski, Wroclaw Univ. of Science and Technology (Poland)
On demand starting 10 October 2021
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We present fabrication of low-loss microchannels in the outer cladding of a nodeless antiresonant hollow-core fiber (ARHCF) using direct laser writing system with a femtosecond laser source. In order to make microchannels with the lowest possible losses, optimization of the process parameters and the cutting method were carried out. The results of our research show that while maintaining high precision, the fabricated microchannels for optimal process parameters introduced low losses at level of ~0.01 dB per single channel. In addition, we demonstrate the possibility of fabricating multiple microchannels around the air core of the fiber in one process.
Session 3: Laser Cladding/Surface Modification and Additive Manufacturing III
In person: 11 October 2021 • 14:30 - 17:20 China Standard Time
Session Chair: Jing Chen, Northwestern Polytechnical Univ. (China)
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Author(s): Yue Zhao, Tsinghua Univ. (China)
In person: 11 October 2021 • 14:30 - 15:00 China Standard Time
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Due to its excellent high-temperature performance, nickel-based superalloys with high content of titanium and aluminum are used to manufacture the key hot-end components of aero engines and gas turbines. The complex structure and harsh operating environment make these components extremely vulnerable to damage, and there is important engineering value to repair the surface defects. In general, the higher the content of titanium and aluminum, the higher the operating temperature, however, the alloy generally belongs to non-weldable material. During the repair process, the liquation cracking is easily induced in the heat-affected zone, and there is still difficult to find an effective solutions.
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Author(s): Ming Jin, Dingyong He, Wei Shao, Zhen Tan, Xingye Guo, Zheng Zhou, Guohong Wang, Xu Wu, Li Cui, Lian Zhou, Beijing Univ. of Technology (China)
In person: 11 October 2021 • 15:00 - 15:20 China Standard Time
11892-12
Author(s): Min Zheng, Northwestern Polytechnical Univ. (China)
In person: 11 October 2021 • 15:20 - 15:40 China Standard Time
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In this study, the development of surface features of Inconel 718 samples fabricated by selective laser melting under different laser powers and scanning speeds has been studied and correlated with the powder melting behaviors through both experimental and modelling approaches. The interaction between laser beam and powder particles was studied by a three-dimensional model using the height function-lattice Boltzmann method. Different process parameters were introduced to perform the simulations, revealing the underlying physics of the surface morphology. Through the calculation of the surface forces, some new insights were given about the powder melting behaviors and the resultant surface features. The simulation results of the top surface morphology were compared with experimental results, and they were in good agreement.
Tea/Coffee Break 15:40 - 16:00
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Author(s): Zhenlu Zhou, Dingyong He, Zhen Tan, Yiming Wang, Zheng Zhou, Xingye Guo, Wei Shao, Li Cui, Guohong Wang, Beijing Univ. of Technology (China); Ying Yang, Beijing Ctr. for Physical and Chemical Analysis (China)
In person: 11 October 2021 • 16:00 - 16:20 China Standard Time
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Author(s): Jinge Liu, Bangzhao Yin, Peng Wen, Tsinghua Univ. (China); Yun Tian, Peking Univ. Third Hospital (China)
In person: 11 October 2021 • 16:20 - 16:40 China Standard Time
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The additive manufacture of magnesium alloy has a promising application prospect. However, the magnesium alloy’s low boiling point, low surface tension and high thermal expansion make it easy to expand after manufacture. In this paper, we employed laser powder bed fusion (LPBF) to fabricate WE43 magnesium alloy porous scaffolds and finally found that combination of high density and precision was difficult to be realized. To solve this problem, an advanced shrinkage of strut size was employed, which made the metal expand to designed volume. Finally, the magnesium scaffolds with high relative density, dimensional accuracy and mechanical properties were successfully obtained.
11892-15
Author(s): Guohao Zhang, Northwestern Polytechnical Univ. (China)
In person: 11 October 2021 • 16:40 - 17:00 China Standard Time
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While the thermal-microstructure relationship in additive manufactured (AM) titanium alloy has been widely reported, the details on how complex thermal history manipulates the microstructural evolution are absent. In order to figure out such doubts, an in-house 3D finite element thermal model is calibrated, and then used to analyze the microstructural development in LSF process. Results show that the distinctive evolutions of the temperature range just underneath β-transus temperature (Tβ) controlled by the printing path are responsible for the diverse distributions of the layer bands at the center and corner of the blocks. Meanwhile, the sizes of α basketweave in the normal region along the building direction are closely linked to the integral area between Tβ and α dissolution temperature. It further demonstrates that the coarsening of α lamellar during thermal cycles is primarily driven by phase-transformation mechanism instead of Ostwald ripening.
11892-16
Author(s): Peng Yang, Dingyong He, Zhen Tan, Wei Shao, Hanguang Fu, Zhenlu Zhou, Xiaoya Zhang, Xingye Guo, Beijing Univ. of Technology (China)
In person: 11 October 2021 • 17:00 - 17:20 China Standard Time
Session 4: Laser Welding/Joining and Laser Peening I
In person: 12 October 2021 • 09:00 - 10:30 China Standard Time
Session Chair: Ting Huang, Beijing Univ. of Technology (China)
11892-17
Author(s): Yingkai Shao, Xiaoyang Li, Beijing Univ. of Technology (China); Li Chen, Enguang He, Beijing Aeronautical Manufacturing Technology Research Institute (China)
In person: 12 October 2021 • 09:00 - 09:20 China Standard Time
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As the third-generation aluminum-lithium alloy developed by China, 2A97 is widely used in the aerospace field. However, the weak fine equiaxed zone (FEQZ) of weld severely limits its application. In this study, the macro- and microscopic characteristics of weld and the formation mechanism of the microstructure were investigated under the condition of large heat input non-autogenous laser welding (NLW) with ER2319 and ER4047 filler metals. The results showed that, the porosity imperfection in 2A97-T3 via NLW could be modified by using ER2319. The addition of Zr in the equiaxed zone resulted in effective refinement of equiaxed dendrites. The distribution of FEQZ concentrated at the four corners of the weld which was affected by the flow of weld pool. Furthermore, the morphology and distribution of FEQZ were influenced significantly by welding parameters and filler metals.
11892-18
Author(s): Maziar Toursangsaraki, Yongxiang Hu, Jiancheng Jiang, Shanghai Jiao Tong Univ. (China)
In person: 12 October 2021 • 09:20 - 09:40 China Standard Time
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The considerable local dissolution of strengthening phases under gradient thermo-mechanical effects of friction stir welding leads to a noticeable decrease in material local hardness and tensile properties in friction stir welded Al-Li joints at the joint central area, known as the thermo-mechanical coupling zone. Consequently, the resulting high gradient in joint local properties at borders of the joint center leads to high local stress concentration and tensile failure under relatively low loading values at this region. In this study, firstly, effects of joint center laser-peening-induced local compressive residual stresses evolution and work hardening are investigated on the enhancement in local hardness and tensile properties of AA2195-T6 friction stir welded joints. Then overall induced joint mechanical property homogeneity effects from these effects are evaluated on the improvement in joint global tensile properties. LP-induced local residual
11892-19
Author(s): Jiejie Xu, Dong Wang, Rongshi Xiao, Ting Huang, Beijing Univ. of Technology (China)
In person: 12 October 2021 • 09:40 - 10:10 China Standard Time
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Dissimilar joining of carbon-fiber reinforced plastics (CFRP) and conventional metal attracts tremendous interest due to the increased usage of CFRP in the aerospace industry.However, until now, laser joining of CFRP to metal is commonly performed with low welding velocity (< 20 mm/s), which limits its practical applications due to the low joining efficiency. In this work,the defect-free CFRP/AA2060 laser joint was achieved with a laser power of 5 kW and a welding velocity of 110 mm/s.Compared with the Gaussian beam, a relatively uniform energy density distribution was obtained with the rectangular spot, thus providing a more uniform temperature field and minimizing the porosity defects. The experimental and simulation results reveal that the CFRP/AA2060 laser joint could be obtained over a wide range of joining parameters due to regulated temperature field distribution. The relation between laser joining parameter and mechanical properties was also discussed.
11892-20
Author(s): Rong Chen, South China Normal Univ. (China)
In person: 12 October 2021 • 10:10 - 10:30 China Standard Time
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Author(s): Tomokazu Sano, Osaka Univ. (Japan)
On demand starting 10 October 2021
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The purpose of the present study was to verify the effectiveness of dry laser peening (DryLP), which is the peening technique without a sacrificial overlay under atmospheric conditions using femtosecond laser pulses on the mechanical properties such as hardness, residual stress, and fatigue performance of laser-welded 2024 aluminum alloy containing welding defects such as undercuts and blowholes. After DryLP treatment of the laser-welded 2024 aluminum alloy, the softened weld metal recovered to the original hardness of base metal, while residual tensile stress in the weld metal and heat-affected zone changed to compressive stresses. As a result, DryLP treatment improved the fatigue performances of welded specimens with and without the weld reinforcement almost equally.
Break
Tea/Coffee Break 10:30 - 11:00
Session 5: Laser Welding/Joining and Laser Peening II
In person: 12 October 2021 • 11:00 - 12:00 China Standard Time
Session Chair: Ting Huang, Beijing Univ. of Technology (China)
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Author(s): Jiayang Gu, Jiangsu Univ. (China); Chunhui Luo, Jiangsu univ. (China); Xudong Ren, Jiangsu Univ. (China)
In person: 12 October 2021 • 11:00 - 11:20 China Standard Time
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The plastic deformation, residual stress, microhardness, phase, microstructure, and tensile property of Q235 steel subjected to laser cavitation peening (LCP) were investigated through the combination of experiments and simulations. LCP causes plastic deformation in the surface layer of material and thereby introducing compressive residual stress and enhancing the microhardness. Dislocation structures including dislocation tangles, dislocation walls, and dislocation cells generate within the grains and near grain boundaries after massive LCP impact. Residual stress, microhardness, and dislocation density increase significantly with the increase of impact times and pulse frequency. The high-density dislocation tangles and the sharing of dislocation cells cause the original coarse grains to be refined into equiaxed fine grains. LCP impact improves the yield strength and ultimate strength of Q235 steel.
11892-23
Author(s): Jiancheng Jiang, Yongxiang Hu, Maziar Toursangsaraki, Shanghai Jiao Tong Univ. (China)
In person: 12 October 2021 • 11:20 - 11:40 China Standard Time
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Author(s): Pengkai Liu, Ningbo Institute of Materials Technology and Engineering (China)
In person: 12 October 2021 • 11:40 - 12:00 China Standard Time
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AZ31B magnesium alloy is a lightweight alloy with good mechanical properties and high specific strength and stiffness. Its density is similar to that of human skeleton, and has good biocompatibility. Therefore, it is widely used in transportation, electronic industry, medical field and military industry. However, the hardness and plastic shear resistance of magnesium alloys are poor, and their corrosion resistance is poor. Its degradation rate is not uniform in the biological field, and it is prone to pitting corrosion, which seriously affects its application. Therefore, the degradation rate and corrosion resistance of magnesium alloy were studied by laser shock peening. Laser shock peening technology is an advanced surface processing technology that can refine grains, improve surface hardness of materials, and improve fatigue resistance and corrosion to improve the surface hardness, corrosion resistance and stable degradation rate of magnesium alloy.
11892-25
Author(s): Yoshio Mizuta, SANKEN, Osaka Univ. (Japan); Yuji Sano, Institute for Molecular Science, National Institutes of Natural Sciences (Japan); Satoshi Tamaki, LAcubed Co., Ltd. (Japan); Yoshihiro Sagisaka, Hamamatsu Technical Support Ctr., Industrial Research Institute of Shizuoka Prefecture (Japan); Tomoharu Kato, Yoshihiro Sakino, Kindai Univ. (Japan); Tomonao Hosokai, SANKEN, Osaka Univ. (Japan)
On demand starting 10 October 2021
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Laser peening treatments were carried out for residual stress measurement and fatigue testing of metallic materials. Even at a pulse energy of 15 mJ, compressive residual stresses were imparted in a near-surface layer of a high-strength steel HT780 to a depth of 0.4 mm and the fatigue properties were also improved.
Break
Lunch Break 12:00 - 13:30
Session 6: Laser Micro-/Nanofabrication and Ultrafast Laser Processing
In person: 12 October 2021 • 13:30 - 15:30 China Standard Time
Session Chairs: Lisha S. Fan, Zhejiang Univ. of Technology (China), Xiaohui Ye, Shaanxi Univ. of Science & Technology (China)
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Author(s): Xiaohui Ye, Shaanxi Univ. of Science & Technology (China)
In person: 12 October 2021 • 13:30 - 14:00 China Standard Time
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Author(s): Xinggang Shang, Ning Wang, Nanjia Zhou, Min Qiu, Westlake Univ. (China)
In person: 12 October 2021 • 14:00 - 14:20 China Standard Time
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Here, a microscale pressure sensor composed of three helical springs alongside a flat cap is proposed and implemented by modified two-photon polymerization techniques. To seek high sensitivity, theoretical analysis as well as numerical simulations are carried out to optimize the geometric parameters including helix height and radius. Further experimental characterizations by an atomic force microscope shows an ultra high sensitivity of ~0.5 N/m. Besides, the hysteresis loop shows a very small mechanical hysteresis. To conclude, these results highlight the unexplored potential of high-precision helix structure for the usages in microelectromechanical systems, small objective mass sensing, and so on.
11892-29
Author(s): Tingge Yuan, Xiongshuo Yan, Yuping Chen, Xianfeng Chen, Shanghai Jiao Tong Univ. (China)
In person: 12 October 2021 • 14:20 - 14:40 China Standard Time
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We demonstrate the second-harmonic generation in a quasi-phase matched type-II waveguide fabricated by femtosecond laser direct writing in the z-cut lithium niobate. In contrast to the previous work that employs type-III configuration to realize the all-optical fabricated quasi-phase matched waveguide, our type-II waveguide has its own advantage in three dimensional coupled nonlinear devices. An enhanced second-harmonic generation of 1064 nm radiation was observed in our structure, with a maximum conversion efficiency of 1.84%. The modulation depth of the second-order nonlinearity can be derived as 0.34. The proposed design expands the application of femtosecond laser direct writing type-II waveguide in the field of nonlinear frequency conversion.
11892-30
Author(s): Lisha Fan, Shuowen Zhang, Qingyu Yan, Qunli Zhang, Zhejiang Univ. of Technology (China); Yongfeng Lu, Univ. of Nebraska-Lincoln (United States); Jianhua Yao, Zhejiang Univ. of Technology (China)
In person: 12 October 2021 • 14:40 - 15:10 China Standard Time
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We demonstrate an effective route for maintaining lattice integrity during the growth of highly-conductive diamonds with heavy boron doping through laser resonant vibrational excitation of a growth-critical active radical, BH2. Significant improvement of diamond crystallinity has been realized with the laser resonant excitations. The highly conductive and crystalline BDD electrodes exhibit significantly enhanced sensing efficiency in oxidizing glucose, confirming the advantages of laser resonant excitations in producing high-performance conductive diamonds. Optical diagnostics of the flame chemistry show that laser resonant excitation of BH2 radicals selectively suppresses the relative abundance of BH radicals and promotes CH and C2 radicals critical to diamond growth, revealing the detrimental role of excessive BH in affecting diamond crystallization.
11892-31
Author(s): Nan Zhang, Nankai Univ. (China)
In person: 12 October 2021 • 15:10 - 15:30 China Standard Time
11892-32
Author(s): Kirill Bronnikov, Institute of Automation and Electrometry (Russian Federation), Novosibirsk State Univ. (Russian Federation); Alexandr Dostovalov, Institute of Automation and Electrometry (Russian Federation), Novosibirsk State Univ. (Russian Federation); Konstantin Okotrub, Institute of Automation and Electrometry (Russian Federation); Aleksandr Kuchmizhak, Institute for Automation and Control Processes (Russian Federation), Far Eastern Federal Univ. (Russian Federation); Viktor Korolkov, Sergey Babin, Institute of Automation and Electrometry (Russian Federation), Novosibirsk State Univ. (Russian Federation)
On demand starting 10 October 2021
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Recently, highly regular thermochemical laser-induced periodic surface structures (TLIPSS) have become the subject of active studies. TLIPSS are formed in the interference maxima due to the local oxidation of the material irradiated with ultrashort laser pulses and are characterized by the elevation of the relief that forms parallel oxide protrusions. The gas surrounding is expected to affect the morphology and chemical composition of the resulting TLIPSS; however, such effects were rarely studied so far. Here we present the results of the TLIPSS fabrication on a glass-supported Si-Ti bilayer film using an astigmatic Gaussian IR femtosecond beam both in air and a nitrogen-rich atmosphere. The formation of ordered TLIPSS with a period of ≈950 nm is observed at slow scanning speeds (~1 μm/s) and low fluences in a nitrogen-rich atmosphere. Raman spectroscopy revealed the presence of TiO2 (rutile) peaks, as well as bands centered at 230 cm-1 and 552 cm-1, which can be related to the TiN.
Conference Chair
Beijing Univ. of Technology (China)
Conference Chair
National Univ. of Singapore (Singapore)
Conference Chair
Jianhua Yao
Zhejiang Univ. of Technology (China)
Conference Chair
Institute for Molecular Science (Japan)
Program Committee
Northwestern Polytechnical Univ. (China)
Program Committee
Beijing Univ. of Technology (China)
Program Committee
Jian Liu
PolarOnyx, Inc. (United States)
Program Committee
Osaka Univ. (Japan)
Program Committee
Huazhong Univ. of Science and Technology (China)
Program Committee
Tsinghua Univ. (China)
Program Committee
ESI, Inc. (United States)
Program Committee
Ningbo Institute of Materials Technology and Engineering (China)
Program Committee
Jiangsu Univ. (China)
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