Effect of strain rate on properties of dual phase steel with high formability
ZHANG Wei1, PAN Yue1, LIU Hua-sai1, LI Chun-guang1, CHEN Hong-sheng2
1. Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100043, China; 2. Quality control Department, Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063210, Hebei, China
Abstract：The microstructure of dual phase steel with high formability increases retained austenite compared with traditional dual phase steel, which shows a certain TRIP effect and better formability, so it is widely used for safety structural parts of vehicle body with complex shape. In order to study the effect of strain rate on the mechanical characteristics and microstructure changes of dual phase steel with high formability HC440/780DHD+Z, the strain rate properties of 7 different strain rates of 0.001, 0.1, 1, 10, 100, 200 and 500 s-1 were tested universal testing machine and hydraulic servo high-speed tensile testing equipment to obtain the variation laws of strength, elongation and plastic product. The fracture morphology of the sample under different strain rates was observed and analyzed, and the variation law of dimple morphology and size affected by strain rate was obtained. The content of retained austenite at the fracture of samples with different strain rates was measured quantitatively, and the relationship between retained austenite and strain rate was obtained. Based on the above analysis, the effects of strain rate on material properties and microstructure were analyzed. The results show that, HC440/780DHD+Z has a certain strain rate sensitivity. The strength, elongation after fracture and strong plastic product of the material show positive strain rate sensitivity, which increases with the increase of strain rate. With the increase of strain rate, the dimple size of the material increases obviously, and the energy absorption ability of the material also increases gradually. Due to the transformation of retained austenite, plastic strengthening occurs in the deformation area, which promotes the deformation of other areas, and then increases the deformation uniformity in the process of plastic deformation, so that the material has better elongation. Therefore, with the increase of strain rate, the transformation amount of retained austenite increases, and the material shows better ductility.
张伟, 潘跃, 刘华赛, 李春光, 陈洪生. 应变速率对增强成形性双相钢性能影响分析[J]. 钢铁, 2022, 57(4): 123-129.
ZHANG Wei, PAN Yue, LIU Hua-sai, LI Chun-guang, CHEN Hong-sheng. Effect of strain rate on properties of dual phase steel with high formability[J]. Iron and Steel, 2022, 57(4): 123-129.
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2022, Vol. 57 
