Hot Deformation Behavior and Processing Maps of a High Al-low Si Transformation-Induced Plasticity Steel: Microstructural Evolution and Flow Stress Behavior
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Hot deformation behavior of a high Al-low Si transformation-induced plasticity (TRIP) steel was studied by an MMS-300 thermo-simulation machine at the temperature range of 1050–1200 °C and strain rate range of 0.01–10 s−1. The constitutive equations of the TRIP steel were established at high temperature by fitting the strain factor with a sixth-order polynomial. The instability during hot rolling was discussed using processing maps. The results reveal that two types of flow stress curves (dynamic recrystallization and dynamic recovery) were observed during the hot compression of the high Al-low Si TRIP steel. Flow stress decreased with increasing deformation temperature and decreasing strain rate. The predicted flow stress of experimental TRIP steel is in agreement with the experimental values with an average absolute relative error of 4.49% and a coefficient of determination of 0.9952. According to the obtained processing maps, the TRIP steel exhibits a better workability at strain rate of 0.1 s−1 and deformation temperature of 1200 °C as compared to other deformation conditions.
KeywordsTRIP steel Hot compression Constitutive equation Processing maps
This work was financially supported by the National Program on Key Basic Research Project (Grant No. 2011CB606306-2) and the National Natural Science Foundation of China (Grant No. 51775102).
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