About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing, Directed Energy Deposition of Metals: Processing – Microstructure – Mechanical Property Relationships
|
| Presentation Title |
Anisotropic Compression Behavior of 316L Stainless Steel at Room and Cryogenic Temperatures: The Influence of Twinning and Transformation Mechanisms |
| Author(s) |
Saurabh Pawar, K.U. Yazar, Khushahal Thool, Wi-Geol Seo, Chang-Gon Jeong, Yoon-Uk Heo, Shi Hoon Choi |
| On-Site Speaker (Planned) |
Shi Hoon Choi |
| Abstract Scope |
This study investigates the microstructural evolution and deformation behavior of 316L SS fabricated via the direct energy deposition (DED) technique under controlled compressive loading. Compression tests were conducted at both room temperature (RT) and cryogenic temperature (CT), along the scanning direction (SD) and the transverse direction (TD) of the material. A combination of experimental techniques electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and electron channeling contrast imaging (ECCI) alongside dislocation density-based crystal plasticity modeling (DAMASK), was employed. As-fabricated DED samples revealed columnar grain growth with cellular sub-structures highlighting Cr/Mo enriched delta-ferrite cell boundaries due to elemental segregation. Deformation mechanisms were temperature-dependent: twinning and screw dislocation slip dominated at RT, while CT deformation was governed by phase interactions and martensitic variant selection, contributing to anisotropy. Furthermore, activation of TWIP and TRIP mechanisms was found to be highly dependent on crystallographic orientation, with [001]-oriented grains exhibiting a higher propensity for deformation. |