| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
H-25: Use of the Hollomon-Jaffe Tempering Parameter to Optimize the Microhardness in a Medium-carbon Low-alloy Cr-Mo Steel |
| Author(s) |
Perla Guadalupe Díaz-Villaseñor, Edgar López-Martínez, Octavio Vázquez-Gómez, Pedro Garnica-González, Héctor Javier Vergara-Hernández |
| On-Site Speaker (Planned) |
Perla Guadalupe Díaz-Villaseñor |
| Abstract Scope |
Secondary hardening generated by the sequential precipitation of alloy carbides was studied on a medium-carbon low-alloy Cr-Mo steel during isothermal tempering. Tempering was carried out at 500, 550, and 600 ºC at different times: 0, 15, 30, 45, 60, 90, 120, 240, 360, 480, and 600 minutes from a fully martensitic microstructure. Vickers microhardness measurements evaluated the tempering degree on specimens previously treated under established conditions. Microhardness behavior was determined using the Hollomon-Jaffe parameter to establish hardening or softening. The microhardness behavior presented resistance to softening, but at relatively short times, the microhardness oscillates depending on the temperature and tempering time. Changes in microhardness were related to the precipitation sequence of alloy carbides. Finally, the tempering parameter was adjusted to optimize the tempering conditions (time and temperature) and maximize the microhardness of the tempered microstructure, validating with additional tests under the conditions obtained by the adjustment and scanning electron microscopy. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Phase Transformations, Other |