About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Performance Steels
|
| Presentation Title |
Characterizing Carbon Partitioning via Atom Probe Tomography and In-Situ Pico-Hardness in Steels |
| Author(s) |
Gaurav Kumar, Eason (Yi-Sheng) Chen |
| On-Site Speaker (Planned) |
Gaurav Kumar |
| Abstract Scope |
The chemical potential gradient of carbon between martensite and retained austenite triggers carbon diffusion at elevated partitioning temperatures. This study explores, both theoretically and experimentally, the thermodynamics of carbon diffusion from martensite to retained austenite during partitioning for low- (0.2%C) and medium carbon (0.4%C) Directly Quenched and Partitioned (DQP) steels. Carbon enrichment in the retained austenite was theoretically calculated from the respective chemical potentials of carbon in martensite and retained austenite. Theoretically predicted carbon enrichment in retained austenite was corroborated with the results of the atom probe tomography. A good correlation was found between theoretical and experimental results. Further, the theoretical calculation also suggested the C content in the martensite after partitioning was the same in 0.2 and 0.4%C steels. This was corroborated with the in-situ pico- indentation based martensite hardness. Hardness measurements in martensite for both steels in the DQP state were comparable indicating similar martensite carbon content. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Phase Transformations, Iron and Steel |