| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Austenite Formation and Decomposition V: A Symposium in Memory of Prof. Mats Hillert
|
| Presentation Title |
Rapid Heating for Enhanced Austenite Reversion and Tensile Properties Toward a Green Cold-Rolled Low-Density Steel |
| Author(s) |
Tomas Scuseria, Dean T. Pierce, Kelcey Garza , Amy J. Clarke, Kester D. Clarke |
| On-Site Speaker (Planned) |
Tomas Scuseria |
| Abstract Scope |
The strengthening potential of cold-rolled and intercritically annealed (IA) low-density steels with high Al additions is limited by soft ä-ferrite and highly stable retained austenite. Rapid heating rates up to 300 °C/s to the IA temperature (up to 950 °C) of a 9Mn-5Al-0.3C (wt%) steel were investigated as a pathway to rapidly form austenite with refined and partially recrystallized grains for strengthening. Resulting microstructures were characterized by EBSD, showing partially recrystallized austenite and á-ferrite constituents with high contrast of geometrically necessary dislocations. In turn, tensile testing revealed increased yield strengths and an enhanced TRIP effect in rapidly heated specimens, attributed to the increased microstructural heterogeneity. Additionally, increased austenite fractions and strain hardening capacities were noted as the heating rate was increased. In total, rapid heating shows promise for future green steel production by removing the need for long isothermal hold times and simultaneously enhancing mechanical properties. |