| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Recrystallization-based Grain Boundary Engineering of 316L Stainless Steel Produced via Selective Laser Melting |
| Author(s) |
Shubo Gao, Zhiheng Hu, Sravya Tekumalla, Matteo Seita |
| On-Site Speaker (Planned) |
Shubo Gao |
| Abstract Scope |
Applying conventional grain boundary engineering (GBE) processing to near-net-shape parts—including those produced via additive manufacturing (AM) technology—is challenging due to the large mechanical strains involved. In this study, we present an alternative route to GBE, which is based on recrystallization of as-built AM alloys. Focusing on selective laser melting (SLM) of 316L stainless steel (316LSS), we investigate how different combinations of process parameters affect the recrystallization fraction—and thus the twin boundary fraction—in the alloy upon heat treatment. Interestingly, we find that higher laser scanning speed yields higher residual stress, but lower recrystallization fraction. We demonstrate that this surprising result stems from the properties of the cellular structures that form during directional solidification of the alloy, which are also a function of laser scanning speed. Our results provide the groundwork for devising AM-compatible GBE strategies to produce high-performance parts with complex geometry. |
| Proceedings Inclusion? |
Planned: |