|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Nano/Micro-mechanics and Length-scale Phenomena
||A nanomechanical approach to reveal the origins of superior intergranular cracking resistance in irradiated additively-manufactured stainless steel
||Xiaoyuan Lou, Jingfan Yang, Laura Hawkins, Lingfeng He, Daniel Schwen
|On-Site Speaker (Planned)
Recrystallized additively-manufactured (AM) 316L stainless steel (SS), though presenting similar grain structure like its wrought counterpart, exhibited much better resistance to irradiated-assisted stress corrosion cracking (IASCC) on the grain boundaries. Microstructure characterization observed a unique nanoscale clustering of precipitates near grain boundaries. Nanoindentation was employed to visualize the interaction between grain boundary and dislocation slip channel. Protocol was developed to conduct such measurement on the oxidized grain boundaries in tensile-tested proton-irradiated samples. The dislocation pile-up was evidenced by local hardness increase. Different from the irradiated wrought 316L SS, the nanoscale clustering near grain boundary region in irradiated AM 316L SS created barrier for dislocations and prevented the direct interaction between grain boundary and slip channels, resulting in strain localization away from grain boundaries. The local stress applied to grain boundaries was reduced. The study demonstrates the ability of nanoindentation to probe the localized phenomenon of mesoscale interfaces.
||Additive Manufacturing, Characterization, Nuclear Materials