Abstract The strain-rate and temperature dependencies of the strain-induced martensitic phase transformation (MPT) of AISI 304 L are experimentally investigated. Firstly, the tensile tests of 304 L at room temperature are conducted at the strain-rates ranges from 6.67 × 10−4 s-1 to 80 s-1. The stress-strain curves indicate a significant strain-rate effect of the strain-induced MPT, which is closely relevant to extent of the adiabatic heating. The second batch of tensile tests are conducted at several representative strain-rates and at different temperatures ranging from 0 °C to 100 °C. The martensitic volume fractions at different plastic deformation stages are measured by X-ray diffraction to trace the evolution of martensitic phase in the tests. The test results indicate that the environmental temperature and the strain-rate exert coupling influence on the stress-strain behavior. Variations in strength and ductility of 304 L in the tests are explained with a competition mechanism between strain-induced MPT, thermal softening and strain-rate strengthening. A kinetic model of MPT is modified to take the strain-rate, initial temperature and temperature rise into account.

中文翻译：

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应变诱导马氏体相变在不同应变速率和温度下 304L 钢机械响应中的作用

摘要 通过实验研究了 AISI 304 L 应变诱导马氏体相变 (MPT) 的应变速率和温度依赖性。首先，在室温下进行 304 L 的拉伸试验，应变速率范围为 6.67 × 10-4 s-1 至 80 s-1。应力-应变曲线表明应变诱导的 MPT 具有显着的应变率效应，这与绝热加热的程度密切相关。第二批拉伸试验是在几个有代表性的应变率和从 0 °C 到 100 °C 的不同温度下进行的。通过 X 射线衍射测量不同塑性变形阶段的马氏体体积分数，以追踪测试中马氏体相的演变。试验结果表明，环境温度和应变速率对应力应变行为产生耦合影响。用应变诱导 MPT、热软化和应变速率强化之间的竞争机制来解释试验中 304 L 强度和延展性的变化。修改 MPT 的动力学模型以考虑应变速率、初始温度和温升。