锻压技术

铸态30Cr2Ni4MoV钢的静态再结晶行为

英文标题：Static recrystallization behavior for cast steel 30Cr2Ni4MoV

作者：徐月焦永星刘建生

单位：太原科技大学

分类号：TG316

出版年,卷(期):页码：2018,43(7):197-203

摘要：

通过采用双道次热压缩的实验方法，在Gleeble-1500D热模拟机上对铸态30Cr2Ni4MoV钢在高温变形时的静态再结晶软化行为进行研究。根据实验结果，分析变形温度、初始晶粒尺寸以及道次间隔时间等不同工艺参数对铸态30Cr2Ni4MoV钢静态软化行为的影响；构建该铸态材料的静态再结晶动力学模型及晶粒尺寸模型，获得该铸态材料的再结晶激活能为207.39 kJ·mol-1。通过实验结果可知：该铸态材料的静态再结晶体积分数随温度的升高、应变的增加、应变速率的加快和道次间隔时间的不断延长而增加，却几乎不受初始晶粒尺寸的影响。对比分析热压缩所得到的实验值与该模型的计算值，验证了所建模型的准确性。

By means of double-pass thermal compression test, the static recrystallization softening behavior of cast steel 30Cr2Ni4MoV during the high temperature deformation was studied by the Gleeble-1500D thermosimulation machine, and the influences of different process parameters, such as deformation temperature, initial grain size and interval time of each pass, on the static softening behavior of cast steel 30Cr2Ni4MoV were analyzed based on the test results. Then, the kinetic model and grain size model for the static recrystallization of the cast material were established, and the activation energy of recrystallization for the cast material was obtained as 207.39 kJ·mol-1. The results show that the volume fraction of static recrystallization for the cast material increases with the increasing of deformation temperature, strain, strain rate and interval time of each pass. But it is almost unaffected by the initial grain size. The accuracy of the model is verified by comparing the test values obtained from thermal compression with the calculated values of the model.

基金项目：

国家自然科学基金资助项目（51275330）

徐月（1993-），女，硕士研究生，E-mail：1776427955@qq.com；通讯作者：刘建生（1958-），男，博士，教授，博士生导师，E-mail：jiansliu@163.com

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