On the origin of the high tensile strength and ductility of additively manufactured 316L stainless steel: Multiscale investigation

作     者：Bassem Barkia Pascal Aubry Paul Haghi-Ashtiani Thierry Auger Lionel Gosmain Frédéric Schuster Hicham Maskrot Bassem Barkia;Pascal Aubry;Paul Haghi-Ashtiani;Thierry Auger;Lionel Gosmain;Frederic Schuster;Hicham Maskrot

作者机构：DEN-Service d’Etudes Analytiques et de Réactivitédes SurfacesCEAUniversitéParis-Saclay91191France Laboratoire de Mécanique des SolsStructures et MatériauxCentralesupélecUMR CNRS 8579UniversitéParis-Saclay92295France Arts et Métiers ParisTechPIMMUMR CNRS 800675013 ParisFrance CEA Cross-Cutting Program on Materials and Processes Skills91191Gif-sur-YvetteFrance 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第41卷第6期

页      面：209-218页

核心收录：

学科分类：12[管理学] 1201[管理学-管理科学与工程(可授管理学、工学学位)] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 080201[工学-机械制造及其自动化] 

基　　金：supported financially by the French Alternative Energies and Atomic Energy Commission partially funded by the ANR under contract number(No.ANR-10EQUIPEX-37) 

主　　题：Additive manufacturing Austenitic stainless steel Dislocation structure Twinning Mechanical behavior Anisotropy 

摘      要：We report that 316L austenitic stainless steel fabricated by direct laser deposition(DLD),an additive manufacturing(AM)process,have a higher yield strength than that of conventional 316L while keeping high *** interestingly,no clear anisotropy in tensile properties was observed between the building and the scanning direction of the 3D printed *** examination of the as-built parts shows a heterogeneous solidification cellular *** electron microscopy observations coupled with Energy Dispersive X-ray Spectrometry(EDS)reveal the presence of chemical micro-segregation correlated with high dislocation density at cell boundaries as well as the in-situ formation of well-dispersed oxides and transition-metal-rich *** hierarchical heterogeneous microstructure in the AM parts induces excellent strength of the 316L stainless steel while the low staking fault energy of the as-built 316L promotes the occurrence of abundant deformation twinning,in the origin of the high ductility of the AM *** additional post-process treatments,the AM 316L proves that it can be used as a structural material or component for repair in mechanical construction.