In this paper, the temperature distribution laws during selective laser melting process of GH4169 alloy were studied. When the laser power was certain, with the scanning speed reduced the temperature of the melt pool increased, which caused the accumulation of lot of heat, and making the maximum temperature over the boiling point of metal, and thus resulted in the melt pool splash and hence affected the quality of forming. When the scanning speed was a constant, with the increase of laser power, the maximum temperature in melt pool increased. And when the laser power was more than 300 W, it was prone to give rise to the vaporization of powder, and reduced the forming quality. During the forming process, the spot center temperature of each scan line decreased firstly and then increased. The temperature increased in the head and the tail of the scan line, and was stable in the middle of the scan line. The change of midpoint temperature of the scan line was stable, which ensured the performance of each layer was consistent during multi-layer scan process.
Temperature distribution laws GH4169 alloy Selecting laser melting Laser power Scanning speed
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The authors thank for The National Natural Science Foundation of China under grant Nos. 51604246, and 51775521, the Primary Research and Development Plan of Shanxi Province under grant No. 201603D121020-1, the supports of the North University of China for Young Academic Leaders.
M. Cloots, K. Kunze, P.J. Uggowizer, K. Wegener, Microstructural characteristics of the nickel-based alloy IN738LC and the cobalt-based alloy Mar-M509 produced by selective laser melting. Mat. Sci. Eng. A-Struct. 658, 68–76 (2016)CrossRefGoogle Scholar
N.J. Harrison, I. Todd, K. Mumtaz, Reduction of micro-cracking in nickel superalloys processed by selective laser melting: a fundamental alloy design approach. Acta Mater. 94, 59–68 (2015)CrossRefGoogle Scholar
A. Basak, S. Das, Microstructure of nickel-base superalloy MAR-M247 additively manufactured through scanning laser epitaxy (SLE). J. Alloy. Compd. 705, 806–816 (2017)CrossRefGoogle Scholar
K. Dai, L. Shaw, Thermal and mechanical finite element modeling of laser forming from metal and ceramic powders. Acta Mater. 52, 69–80 (2004)CrossRefGoogle Scholar
L.Y. Li, D.D. Gu, Parametric analysis of thermal behavior during selective laser melting additive manufacturing of aluminum alloy powder. Mater. Design. 63, 856–867 (2014)CrossRefGoogle Scholar
Y. Huang, L.J. Yang, X.Z. Du, Y.P. Yang, Finite element analysis of thermal behavior of metal powder during selective laser melting. Int. J. Therm. Sci. 104, 146–157 (2016)CrossRefGoogle Scholar
Q.M. Shi, D.D. Gu, M.J. Xia, S.N. Cao, T. Rong, Effects of laser processing parameters on thermal behavior and melting/solidification mechanism during selective laser melting of TiC/Inconel 718 composites. Opt. Laser Technol. 84, 9–22 (2016)CrossRefGoogle Scholar