| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Analysis of Martensitic Transformation in Metastable Austenitic Stainless Steel during Electrochemical Polishing |
| Author(s) |
Junyoung Chae, Hojun Gwon, Chanwoo Jeong, Guihyung Lee, Hyukjae Lee, Hyungjun Cho, Sung-Joon Kim, Heung Nam Han |
| On-Site Speaker (Planned) |
Junyoung Chae |
| Abstract Scope |
We examined the martensitic transformation kinetics for metastable stainless steel during electrochemical polishing (EP) for stainless steel specimens with varying surface roughness and austenite stability. The martensite fraction measured by EBSD showed that specimens with higher surface roughness and lower austenite stability exhibited notably enhanced levels of martensitic transformation. The amount of charge build-up on the specimen surface during EP was calculated using COMSOL multiphysics simulations to understand these phase transformation characteristics. The effect of charge build-up-induced stress was analyzed by employing previously published first-principles calculations. We found that specimens with higher surface roughness accumulated more charge build-up, resulting in greater stress and a martensitic transformation driving force. Moreover, Thermo-Calc was utilized to calculate the critical energy for the martensitic transformation for specimens with different austenite stabilities. We demonstrated that the kinetics of martensitic transformation during EP can be described as an extension of stress-induced martensitic transformation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Phase Transformations, Electrometallurgy |