| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
O-45: JMA Model Application to Elucidate the Kinetic Parameters in a Silicon Steel during Continuous Heating |
| Author(s) |
Alexis Iván Gallegos-Pérez, Octavio Vázquez-Gómez, José Jaime López-Soria, Héctor Javier Vergara-Hernández, Pedro Garnica-González |
| On-Site Speaker (Planned) |
Alexis Iván Gallegos-Pérez |
| Abstract Scope |
The kinetic parameters k and n of the Johnson-Mehl-Avrami model were determined according to the heating rate in an experimental medium-carbon steel alloyed with silicon. In this regard continuous heating dilatometric tests were carried out under an inert atmosphere and it was observed that the silicon content tends to displace austenite formation temperatures up to values higher than 1000 °C. Through the experimental data, the austenite volume fraction was calculated using the lever rule and fitted with the model. The fit showed an imprecision with respect to the extension of transformation by the presence of two peaks in the first derivative curve, suggesting changes in the transformation mechanisms due to the silicon content. Therefore, an analysis by stages was required to elucidate the kinetic parameters in each region to improve the approximation of the Johnson-Mehl-Avrami model and correlate the parameters with the nucleation and growth modes. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |