材料科学
原位
冶金
接种
锰
化学
有机化学
免疫学
生物
作者
Mohammad Reza Jandaghi,Hesam Pouraliakbar,Sang Hun Shim,Vahid Fallah,Sun Ig Hong,Matteo Pavese
标识
DOI:10.1016/j.msea.2022.144114
摘要
The grain refining impact of Ti in additively manufactured steels as well as the outstanding formability of high-Mn steels owing to their low stacking fault energy (SFE) has been confirmed in the literature. In the current work, Ti and Mn were inoculated simultaneously to the stainless steel 316 L by laser powder bed fusion (LPBF) in-situ alloying. The local accumulation of the additions developed complexes of Ti-rich brittle phases that improved strength. Microstructural observations revealed the formation of intermetallic chunks of FeTi ( bcc ), σ ( tetragonal ), and C14 Laves phase ( hcp ) surrounded by emerged ferrite grains within the austenite. The rapid solidification of the molten tracks induced significant thermal stresses, which were responded by the generation of geometrically necessary dislocations (GNDs) at the austenite/ferrite interfaces, and activation of synchroshear mechanism within the Laves phase along with thermally activated slip systems in FeTi phase. Mn addition contributed to higher interface cohesion by facilitating dissociation of dislocations.
科研通智能强力驱动
Strongly Powered by AbleSci AI