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利用单道次、双道次热压缩试验研究铸态P91合金钢在热变形后的动态、静态、亚动态再结晶行为,探索不同变形温度、应变速率、变形量对静态、亚动态再结晶的影响并建立静态、亚动态再结晶动力学方程。研究得出:热变形结束后,静态再结晶率随变形温度、变形量及应变速率的增大而增大;亚动态再结晶率与变形温度、变形量和应变速率呈单调递增,并最终趋于稳定。以真应变为参数,铸态P91热变形后再结晶类型可按照真应变分为三种情况:当ε<ε_c时,道次间隔主要发生静态再结晶;当ε_c<ε<ε_T时,同时发生静态、亚动态再结晶;当ε>ε_T时,主要发生亚动态再结晶。通过对双道次压缩试样的显微组织分析得出:相同变形条件下,亚动态再结晶晶粒比静态再结晶细小,再结晶晶粒随变形温度增加而增大,随应变速率增大而减小。
The dynamic, static and sub-dynamic recrystallization behavior of as-cast P91 alloy steel after hot deformation was investigated by single pass and double pass hot compression tests. The effects of different deformation temperature, strain rate and deformation on the static and sub-dynamic recrystallization Affect and establish static, sub-dynamic recrystallization kinetics equation. The results show that after the thermal deformation, the static recrystallization rate increases with the increase of deformation temperature, deformation and strain rate. The sub-dynamic recrystallization rate, deformation temperature, deformation and strain rate increase monotonously, Stable. Taking true strain as parameter, the recrystallization types of as-cast P91 after hot deformation can be classified into three cases according to true strain: when ε <ε_c, the static recrystallization mainly takes place during the pass interval; when ε_c <ε <ε_T occurs simultaneously Static, sub-dynamic recrystallization; when ε> ε_T, sub-dynamic recrystallization occurs mainly. Through the microstructure analysis of the double-pass compression test, the sub-dynamic recrystallization grains are smaller than the static recrystallization under the same deformation conditions, and the recrystallized grains increase with the increase of the deformation temperature. With the increase of the strain rate And reduce.