The effects of rolling temperature on the microstructure and mechanical properties of a high‐Mn austenitic steel is investigated. It is observed that the grain size decreases with the decrease in rolling temperature, resulting in an increase in yield strength (YS) and an increase in ultimate tensile strength (UTS). Mechanical twinning is found to be less active in fine‐grained specimen, leading to the decrease in uniform and total elongations and impact toughness. The existence of dislocations and nanoscale mechanical twins in the initial microstructure contributes to the high YS, and the active mechanical twinning during deformation maintains excellent ductility and impact toughness. The thick twins (generally thicker than 300 nm and formed during hot rolling) play a supplementary role in increasing the instantaneous strain hardening during the late stage of tensile deformation.

中文翻译：

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轧制温度对低温应用高锰奥氏体钢组织和力学性能的影响

研究了轧制温度对高锰奥氏体钢的组织和力学性能的影响。观察到，随着轧制温度的降低，晶粒尺寸减小，导致屈服强度（YS）增加和极限抗拉强度（UTS）增加。发现机械孪晶在细颗粒样品中的活性较低，从而导致均匀和总伸长率以及冲击韧性的降低。初始微观结构中位错和纳米级机械孪晶的存在有助于获得较高的YS，变形过程中的主动机械孪晶可保持出色的延展性和冲击韧性。