Cryogenic mechanical properties of 316L stainless steel fabricated by selective laser melting
作者： Lilin Wang , Xin Lin , Weidong Huang , Shuya Zhang , Chao Wang
DOI: 10.1016/J.MSEA.2021.141317
关键词:
摘要: Abstract 316L stainless steel fabricated by selective laser melting (SLM) has a wide range application in complex structural parts servicing at cryogenic temperature due to its good corrosion resistance and extremely low ductile-brittle transition temperature. In present work, the as-built heat-treated microstructure mechanical properties of SLM-fabricated were investigated. Due high cooling rate SLM process, unique microstructure, consisting heterogeneous columnar grain structure with weak texture intragranular cellular attaching dislocation network. The yield, ultimate tensile strength, elongation horizontal specimens are 840 MPa, 1510 MPa 35%, those vertical 785 MPa, 1400 MPa 37%. After annealing treatment, yield strength decreases increases, but changes little. ratio is attributed martensite transformation during deformation owing stacking fault energy By comparing content different strains directions, it was found that dominant factor for anisotropy ductility specimens. also favor generation shear band increase nucleation sites α′ martensite, finally promoting occurrence transformation, effect substructure on limited compared influence texture.
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