Effect of Testing Temperature on Retained Austenite Stability of Cold Rolled CMnSi Steels Treated by Quenching and Partitioning Process |
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| Authors: | Weijun Feng Zhibing Wu Li Wang John G. Speer |
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| Affiliation: | 1. State Key Laboratory of Development and Application Technology of Automotive Steels, Shanghai 201900, P. R. China;2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China;3. Advanced Steel Processing and Products Research Center, Colorado School of Mines, Golden, CO 80401, USA |
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| Abstract: | The effect of testing temperature on retained austenite (RA) stability of industrially cold rolled CMnSi sheet steel treated by quenching and partitioning (Q&P) process has been investigated by observing the deformation and transformation behavior of RA at different testing temperatures. Uniaxial tensile properties at different temperatures were determined and a correlation between RA stability and mechanical properties were also established. Ultimate tensile strength increases monotonously when temperature decreases, while total elongation reaches an optimum value between 0 and 20°C, where RA exhibits the greatest TRIP effect. Work hardening rate was calculated to decrease through three different stages in an oscillation manner, leading to significant enhancement in both strength and ductility. The kinetic of deformation‐induced martensite transformation is also studied and the stability of RA can be evaluated by comparing the kinetic parameter β. |
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| Keywords: | AHSS quenching and partitioning retained austenite TRIP effect |
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