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--1.49×10-1s-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 effect of strain rate on the mechanical properties has been investigated for a solid–solution treated TWIP steel Fe–23Mn–2Al–0.2C. The results show that the strain rate in the range of 2.97×10−4– 1.49×10−1s−1 has no obvious influence on yield strength. However, tensile strength was slightly decreased and elongation evidently decreased as the strain rate was increased. Deformation behavior with three stages was observed as the change of strain hardening rate for low strain rate. While for high strain rate, there exist only two stages in the deformation behavior with respect to the strain hardening rate and true strain. Strain hardening exponent of this steel increases with increasing true strain. High density deformation twins forms during the deformation for different strain rates, and the width of deformation twin lath decreases as the strain rate increases.
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