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.
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