耐热合金钢P91热变形过程静态及亚动态再结晶行为
发布时间：2018-11-10 09:00
【摘要】：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εε_c时,道次间隔主要发生静态再结晶;当ε_cεε_T时,同时发生静态、亚动态再结晶;当εε_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。
[Abstract]:The dynamic, static and subdynamic recrystallization behavior of as-cast P91 alloy steel after hot deformation was studied by single pass and double pass thermal compression test. The effect of subdynamic recrystallization and the kinetic equations of static and subdynamic recrystallization were established. The results show that the static recrystallization rate increases with the increase of deformation temperature, deformation rate and strain rate, and the subdynamic recrystallization rate increases monotonously with deformation temperature, deformation rate and strain rate, and eventually tends to be stable. The recrystallization types of as-cast P91 can be divided into three cases according to the true strain: static recrystallization at 蔚 c, static recrystallization at 蔚 c 蔚 T and subdynamic recrystallization at the same time when 蔚 c 蔚 T. When 蔚 _ T, subdynamic recrystallization occurs. The microstructure analysis of double pass compression specimens shows that the subdynamic recrystallization grains are finer than those of static recrystallization under the same deformation conditions. The recrystallization grains increase with the increase of deformation temperature and decrease with the increase of strain rate.
【作者单位】： 太原科技大学材料科学与工程学院;太原科技大学金属材料成性理论与技术山西省重点实验室;
【基金】：山西省回国留学人员科研(2015-086) 国家自然科学基金(51135007,51675361)资助项目
【分类号】：TG142.1
[Abstract]:The dynamic, static and subdynamic recrystallization behavior of as-cast P91 alloy steel after hot deformation was studied by single pass and double pass thermal compression test. The effect of subdynamic recrystallization and the kinetic equations of static and subdynamic recrystallization were established. The results show that the static recrystallization rate increases with the increase of deformation temperature, deformation rate and strain rate, and the subdynamic recrystallization rate increases monotonously with deformation temperature, deformation rate and strain rate, and eventually tends to be stable. The recrystallization types of as-cast P91 can be divided into three cases according to the true strain: static recrystallization at 蔚 c, static recrystallization at 蔚 c 蔚 T and subdynamic recrystallization at the same time when 蔚 c 蔚 T. When 蔚 _ T, subdynamic recrystallization occurs. The microstructure analysis of double pass compression specimens shows that the subdynamic recrystallization grains are finer than those of static recrystallization under the same deformation conditions. The recrystallization grains increase with the increase of deformation temperature and decrease with the increase of strain rate.
【作者单位】： 太原科技大学材料科学与工程学院;太原科技大学金属材料成性理论与技术山西省重点实验室;
【基金】：山西省回国留学人员科研(2015-086) 国家自然科学基金(51135007,51675361)资助项目
【分类号】：TG142.1
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