About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Materials, Processes and Applications for Energy Industry
|
| Presentation Title |
Effect of Precipitates Formation and Oxide Particles on Recrystallization in Stainless Steel 316H Processed by Laser Powder Bed Fusion |
| Author(s) |
Gyan Shankar Nln, Selda Nayir, Peeyush Nandwana |
| On-Site Speaker (Planned) |
Gyan Shankar Nln |
| Abstract Scope |
Stainless steel (SS) 316H was printed using laser powder bed fusion (L-PBF) for potential structural and high service temperature applications. It requires uniform and predictable microstructures and properties of printed parts to qualify for such critical application. Microstructural heterogeneities, localized strain gradients, columnar grain structures, and anisotropic properties are the inherent features of as-fabricated L-PBF parts. Heat-treatment of printed parts were carried out aiming to produce homogeneous equiaxed recrystallized microstructure. However, presence of elemental segregation (Cr and Mo), impurities oxide particles such as alumina, and formation of precipitates hinder recrystallization even at 1200 °C. These particles were found to pin the grain boundaries resulting in reduced recrystallization kinetics. Alumina particles were found to be most detrimental in reducing the grain boundary mobility due to its nano-size uniform distribution across the microstructure favoring the Zener pinning effect. These findings provide a solution to the post-build processing of SS 316H L-PBF materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Iron and Steel, Characterization |