| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Response of Materials Investigated Through Novel In-Situ Experiments and Modeling
|
| Presentation Title |
Per-grain behaviour in a duplex-steel during stress induced phase transformations |
| Author(s) |
James Ball, David M. Collins |
| On-Site Speaker (Planned) |
David M. Collins |
| Abstract Scope |
To understand the macromechanical response of a polycrystalline material, the grain level response must be unambiguously known. This is particularly true for alloys that possess a stress-induced phase transformation. Here, a novel duplex steel with a deliberately destabilised austenite phase was studied to explore deformation-induced martensitic transformations at low plastic strains. In-situ three-dimensional X-ray diffraction (3DXRD) and electron backscatter diffraction (EBSD) were used to track the austenite to martensite transformation at the per-grain level, to ascertain relationships between grain orientation, location and stress. Epsilon and alpha martensite were observed to form, with larger austenite grains evidently less stable. The local phase environment was shown to favour epsilon formation, notably in the presence of nearby ferrite and alpha martensite. A strong correlation was also found between grain stress state, crystal orientation and the propensity to transform. These findings are considered key for the future design of alloys by tailoring microstructure. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Iron and Steel, Phase Transformations |