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Optical methods of on-line diagnostics of processes of the Nickel alloy powder consolidation in the layer-by-layer laser melting technology
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Paper Abstract

The results of optical diagnostics of physical processes occurring on the surface of Nickel alloy powder melt in selective laser melting (SLM) technology are presented. The independent registration of the dynamics of the brightness temperature and the fraction of the laser radiation reflected from the surface of the melt was carried out. The dependences of the surface temperature of the melt averaged over the time of observation on the specific volumetric heat input were obtained for the two values of the width of the generated paths. A multiwave method of optical diagnostics is proposed, including monitoring of laser radiation reflected from the melt surface. It is shown that amplitude pulsations of the reflected radiation induced by fluctuations of the relief of the melt surface associated with dynamics of the surface temperature of the melt: the number of ripples on the waveform of the reflected radiation increases at the stages of decline of the brightness temperature. This observed phenomenon shows the relationship between changes in surface topography and convective processes in the melt during laser heating. Analysis of the signals determined by the reflection of laser radiation from the melt surface allows to determine the moments of change in the intensity of heat and mass transfer in a shorter time than when controlling the melt temperature. The results of the study can be used in the development of methods and tools for monitoring and operational control of the SLM process.

Paper Details

Date Published: 21 June 2019
PDF: 6 pages
Proc. SPIE 11056, Optical Measurement Systems for Industrial Inspection XI, 1105632 (21 June 2019); doi: 10.1117/12.2527632
Show Author Affiliations
Y. N. Zavalov, Institute of Laser and Information Technologies (Russian Federation)
A. V. Dubrov, Institute of Laser and Information Technologies (Russian Federation)
V. D. Dubrov, Institute of Laser and Information Technologies (Russian Federation)


Published in SPIE Proceedings Vol. 11056:
Optical Measurement Systems for Industrial Inspection XI
Peter Lehmann; Wolfgang Osten; Armando Albertazzi Gonçalves Jr., Editor(s)

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