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Proceedings Paper

Research on laser melting/alloying combined strengthening of the camshaft of air-cooled diesel engine
Author(s): Wenjin Liu; Minlin Zhong; Haiyun Zhao; Hongjun Zhang; Weimin Zhang; Guoqing Huang
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Paper Abstract

This paper reported the research results on 3 kw cw CO2 laser melting-alloying combined strengthening of the camshaft of air-cooled diesel engine used in the desert oil field. The 45 steel camshaft was pretreated with the conventional quenching and high temperature tempering. A focused laser beam with power density 1.5 - 1.7 X 104 w/cm2 was used to alloy the cam lobe area, while the other area of the cam was treated by laser melting using a focused 12 X 1.5 mm rectangular beam (power density 1.1 X 104 w/cm2) produced by a newly developed binary optics. The microstructure of the laser alloyed region is fine Fe-Cr-Si-B multi-element hypereutectic structure with hardness HRC 63 - 64. The melted layer consists of fine needle-shaped martensite and residual austenite structure with hardness HRC 58 - 61. The strengthened layer is 1.0 - 1.3 mm in thickness with pore-free and crack-free and good surface quality. Under the same condition, the Ring-block (SiN ceramic) wear test proves that the wear of the laser alloyed 45 steel ring is only 29 percent of that of induction quenching 45 steel ring. And a 500 hours test engine experiment demonstrates that the average wear of the laser alloyed cam is only 20 percent of that of induction quenched one.

Paper Details

Date Published: 8 April 1996
PDF: 7 pages
Proc. SPIE 2703, Lasers as Tools for Manufacturing of Durable Goods and Microelectronics, (8 April 1996); doi: 10.1117/12.237744
Show Author Affiliations
Wenjin Liu, Tsinghua Univ. (China)
Minlin Zhong, Tsinghua Univ. (China)
Haiyun Zhao, Tsinghua Univ. (China)
Hongjun Zhang, Tsinghua Univ. (China)
Weimin Zhang, Tsinghua Univ. (China)
Guoqing Huang, Tsinghua Univ. (China)


Published in SPIE Proceedings Vol. 2703:
Lasers as Tools for Manufacturing of Durable Goods and Microelectronics
Jan J. Dubowski; Jyotirmoy Mazumder; Leonard R. Migliore; Chandrasekhar Roychoudhuri; Ronald D. Schaeffer, Editor(s)

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