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开展了固溶处理后TWIP钢Fe-23Mn-2Al-0.2C的拉伸实验,研究了应变速率对其拉伸变形行为的影响。结果表明,当应变速率在2.97×10~(-4)-1.49×10~(-1)s~(-1)范围内变化时,钢的屈服强度没有明显变化,随着应变速率增大,抗拉强度稍有降低,延伸率明显减小。当应变速率较低时,其加工硬化速率随着真应变呈现三个阶段的变化趋势;随着应变速率的提高,加工硬化速率随着真应变的变化趋势由三个阶段变为两个阶段。随着应变速率和真应变的增大,钢的加工硬化指数随之增大。对于不同的应变速率,实验钢变形时均形成高密度的形变孪晶,且随着应变速率的增大,形变孪晶束的宽度减小。
The tensile test of TWIP steel Fe-23Mn-2Al-0.2C after solution treatment was carried out. The effect of strain rate on the tensile deformation behavior was investigated. The results show that the yield strength of steel does not change obviously when the strain rate varies from 2.97 × 10 -4 to -1.49 × 10 -1 s -1. With the increase of strain rate, Tensile strength decreased slightly, the elongation decreased significantly. When the strain rate is low, the work hardening rate shows a three-step trend with the true strain. With the increase of the strain rate, the work hardening rate changes from three stages to two stages with the true strain changing trend. With the increase of strain rate and true strain, the work hardening index of steel increases accordingly. For different strain rates, high deformation deforming twins were formed during the deformation of the experimental steel, and as the strain rate increased, the width of the deformed twin beam decreased.