Research progress in stress corrosion of additively manufactured 316L stainlesss teels

(SCC),as an important research direction in the interdisciplinary of material mechanics and corrosion electro chemistry, is one of the main failure modes of stainless steel components. Compared with traditional wrought technology, additive manufacturing (AM) 316L stainless steel has complicated microstructure and inherent defects including pores and lack of fusion places (LOF) caused by additive manufacturing process, resultingin more complex SCC behavior. Herein, the basic SCC behavior of 316L stainless steel was discussed in detail on the basis of the researches of AM316L stainless steel at home and abroad. The main contents include two stress corrosion mechanisms of hydrogen induced cracking and anodic dissolution. Two behavior of trans granular cracking and intergranular cracking were described.The effects of micro structure on SCC behavior of AM316L, including twins, different cry stalinter face, pores, LOF, and element segregation were summarized. The current situation and advantages of three in-situ characterization methods, including electro chemical noise, high-resolution neutron diffraction and three-dimensional morphology characterization were introduced, which are of great significanceto explorethe SCC behavior of AM316L. Finally, the prospective future of the research directions of SCC behavior of additive manufacturing stain less steel were proposed, including there search of SCC characteristics under high temperature irradiation environment and the principle of stress distribution and restructuration at cracktips.