Balling phenomena in direct laser sintering of stainless steel powder: Metallurgical mechanisms and control methods
作者： Dongdong Gu , Yifu Shen
DOI: 10.1016/J.MATDES.2009.01.013
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摘要: Abstract Balling effect, as an unfavorable defect associated with direct metal laser sintering (DMLS), is a complex physical metallurgical process. In this work, two kinds of balling phenomena during DMLS 316L stainless steel powder were investigated and the mechanisms elucidated. It was found that using low power gave rise to first kind characterized by highly coarsened balls possessing interrupted dendritic structure in surface layer balls. A limited amount liquid formation undercooling degree melt due input responsible for its initiation. The second featured large micrometer-scaled (∼10 μm) on sintered occurred at high scan speed. Its ascribed laser-induced splashes caused capillary instability melt. Feasible control methods proposed alleviate phenomena. showed increasing volumetric density energy input, which realized power, lowering speed, or decreasing thickness, decreased tendency balling. addition trace deoxidant (H 3 BO KBF 4 ) yielded smooth free
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