About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing: Materials Design and Alloy Development IV: Rapid Development
|
Presentation Title |
NOW ON-DEMAND ONLY - Site-specific Grain Boundary Engineering of Additively Manufactured Stainless Steel |
Author(s) |
Shubo Gao, Matteo Seita |
On-Site Speaker (Planned) |
Shubo Gao |
Abstract Scope |
Owing to the copious mechanical strain required, conventional grain boundary engineering (GBE) processing of metals and metal alloys is unfit to parts produced via additive manufacturing (AM). However, being able to control the grain boundary character distribution in AM would open the path to producing high-performance metal parts with complex geometry. We present a possible strategy to achieve this goal, which we term “additive grain boundary engineering” (AGBE). By tuning the process parameters during laser powder bed fusion (LPBF) of 316L stainless steel, we gain site-specific control of the solidification microstructure—including cell size and level of micro-segregation—which dictate the alloy thermal stability. Upon heat treatment, this controlled microstructure heterogeneity leads to site-specific recrystallization, which in turn enables engineering the grain boundary character distribution. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Solidification, Iron and Steel |