Hot compression tests of 3% Si steel with a true strain range of 0.02–0.92 at a strain rate of 1 s⁻¹ and a temperature of 1173 K, based on the Gleeble‐1500 thermo–mechanical simulator, are conducted. The effect of strain on the strain‐induced precipitation behavior of MnS is investigated via cold field‐emission ultrahigh resolution scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The experimental results obtained indicate that the volume density of MnS precipitates increases, whereas the mean diameter of MnS precipitates decreases with the increase in strain during the transient deformation stage. However, during the steady deformation stage, these parameters remain nearly constant. The precipitation behavior of MnS during the transient deformation stage is attributed to the increase in dislocation density with the increase in strain. More dislocations create a larger number of nucleation sites, which, in turn, increase the nucleation rate. At the same time, a model about static recovery affecting the dislocation density in the matrix after deformation is also proposed to elucidate the mechanism of the evolution of MnS in the aging process.

中文翻译：

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应变对3％Si钢中MnS的应变诱发析出行为的影响

在1 s ^-1的应变速率下，真实应变范围为0.02–0.92的3％Si钢的热压缩测试基于Gleeble-1500热力机械模拟器，温度为1173K。通过冷场发射超高分辨率扫描电子显微镜（FESEM）和透射电子显微镜（TEM）研究了应变对MnS的应变诱导析出行为的影响。实验结果表明，在过渡变形阶段，MnS析出物的体积密度增加，而MnS析出物的平均直径随应变的增加而减小。但是，在稳定变形阶段，这些参数几乎保持不变。MnS在瞬态变形阶段的析出行为归因于位错密度随应变的增加而增加。位错越多，产生的成核位点越多，增加成核速率。同时，建立了影响变形后基体中位错密度的静态回复模型，以阐明MnS在时效过程中的演化机理。