Optimizing the performance of wind field circulating track in laser powder bed fusion additive manufacturing.

Autor: Gao, Yu, Zhang, Cheng-lin, Liu, Jiang-lin, Pan, Lu
Předmět:
Zdroj: International Journal of Advanced Manufacturing Technology; Feb2023, Vol. 124 Issue 11/12, p3963-3972, 10p, 1 Color Photograph, 11 Diagrams, 1 Chart, 1 Graph
Abstrakt: Laser powder bed fusion (L-PBF) has become one of the most promising technologies in metal additive manufacturing (MAM). In the forming process of L-PBF, due to laser beam and metal powder characteristics, soot will be generated, reducing the forming quality and lifetime of lasers. The traditional movement track of the wind field inside the forming warehouse shows an apparent vortex. Vortex led to the chaos of soot and other impurities inside the forming warehouse, which seriously affected the forming quality for L-PBF. The forming mechanism of soot was invested and obtained: liquid metal vaporized and splashed, which formed soot after cooling. Besides, due to too high temperature (local temperature of SS316L reached up to 3509.73 K), the powder was directly burned to form soot. This study designed an optimized wind field circulating structure in L-PBF, and CFD obtained a parabolic wind circulating track. To verify the reliability of the optimized wind field circulating structure, we used a metal 3D printer to fabricate experimental samples of SS316L. The results show that an optimized parabolic circulating track could seriously decrease soot on the surface of samples, and internal impurities of samples decreased. Accordingly, crack defects caused by impurities were reduced. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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