【摘要】 研究了TWIP钢Fe-23Mn-2Al-0.2C固溶处理后的组织演变和拉伸变形行为,并对其变形机制进行了探讨。结果表明:随固溶温度升高,实验钢的晶粒尺寸逐渐增大,屈服强度和抗拉强度均降低,伸长率增大,强塑积先增大后减小,在900℃时达到最高;实验钢的拉伸变形呈现连续屈服,同时随固溶温度升高,加工硬化速率(dσ/dε)与真应变(ε)的变化关系由2阶段变为3阶段。通过OM和TEM观察显示,随着晶粒尺寸的增加,变形过程中形变孪晶数量增多,孪晶诱导塑性(TWIP)效应增大。更多还原

【Abstract】 Tensile deformation behavior and microstructural evolution of Fe-23Mn-2Al-0.2C TWIP steel after solution treatment were studied and the deformation mechanism was discussed.The results show that as increase of the solution temperature,grain size of the steel gradually increases,its yield strength and tensile strength decrease,while plasticity increases.The product of strength and plasticity first increases and then decreases with the temperature increase from 700 ℃ to 1100 ℃,and reaches the peak value at 900 ℃.Deformation behavior with three stages was observed for the steel solution-treated at high solution temperatures.While at low temperature,there exist only two stages in the deformation behavior for the dependence of strain hardening rate on true strain.With increasing the grain size,more deformation twins are observed in the deformed steel and the effect of twining induced plasticity(TWIP) increases.更多还原