| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Performance Steels
|
| Presentation Title |
Tempering of Low Carbon Martensite, Experimental Results and Model Development |
| Author(s) |
Juan Agustin Macchi, Julien Teixeira, Guillaume Geandier, Sabine Denis, Frédéric Bonnet, Sébastien Allain |
| On-Site Speaker (Planned) |
Juan Agustin Macchi |
| Abstract Scope |
As-quenched martensite has a high UTS with a relatively low maximum elongation. To customize the mechanical behavior, tempering treatments are usually applied. During these treatments, C atoms segregate from the oversaturated matrix into defects, followed by the precipitation of transition carbides (if the C content is high enough) and finishing with their dissolution and cementite formation. In the present works characterizations at different scales (Atom Probe Tomography, TEM, and in-situ High Energy XRD) were performed to determine the mentioned transitions in 0.1, 0.2, and 0.3 wt.%C steels. A class-type precipitation model has been developed considering C segregation, epsilon, and cementite precipitation. The fraction, size, and density of the carbides as well as the C concentration segregated to dislocations and matrix have been calculated for temperings at 200, 300, and 400°C. Generally good agreement is found between experimental and model results. The impact of segregation on the precipitation sequence is analyzed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Phase Transformations, Characterization |