Microstructure and Fracture Behavior of 316L Austenitic Stainless Steel Produced by Selective Laser Melting

被引:429
作者
Casati, R. [1 ]
Lemke, J. [1 ]
Vedani, M. [1 ]
机构
[1] Politecn Milan, Dept Mech Engn, Via La Masa 34, Milan, Italy
关键词
AISI; 316L; Additive manufacturing; Selective laser melting; Microstructural analysis; Fracture behavior; MECHANICAL-PROPERTIES; TEXTURE; METALS; POWDER; IMPACT;
D O I
10.1016/j.jmst.2016.06.016
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Selective laser melting is an additive manufacturing method based on local melting of a metal powder bed by a high power laser beam. Fast laser scans are responsible for severe thermal gradients and high cooling rates which produce complex hydrodynamic fluid flow. These phenomena affect crystal growth and orientation and are believed to be the cause of material spattering and microstructural defects, e.g. pores and incompletely melted particles. In this work, the microstructure and texture of 316L bars built along two different orientations and the effect of different distribution of defects on their mechanical response and failure mechanisms were investigated. Partially molten powder particles are believed to be responsible for the scattering in elongation to failure, reduced strength, and premature failure of vertical samples. Copyright (C) 2016, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited.
引用
收藏
页码:738 / 744
页数:7
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