Hot deformation behavior and hot rolling verification of Q1100 ultra-high-strength steel

Abstract

The evaluation of the hot workability and applying it to hot rolling process are crucial for the optimization of microstructure of steel. In this study, the hot workability of Q1100 steel was studied by a combination of hot compression tests, hot rolling application, and microstructure characterization. The results show that the established recrystallization kinetic models can effectively predict stress variation during hot deformation. The calculated DRX volume fraction is positively related to deformation temperature, and negatively related to the strain rate and Zener-Hollomon parameter. Then the relationship between hot working parameters and microstructure evolution was established by drawing the hot processing maps. The hot processing maps were further applied to hot rolling. When the steel is rolled inside the optimum hot processing window, the macroscopic surface of the steel plate is relatively flat, and its microstructure is mainly composed of continuous dynamic recrystallization (CDRX) grains. The orientation difference between CDRX grains and the adjacent grains is small. When the steel is rolled inside the flow instability region, cracks appear on the macroscopic surface, and the microstructure includes deformed grains and discontinuous dynamic recrystallization (DDRX) grains. The DDRX grains have a large orientation difference with adjacent grains.

Keywords

hot deformation behavior / hot processing map / hot rolling / ultra-high-strength steel / continuous dynamic recrystallization / discontinuous dynamic recrystallization

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Central South University