锻压技术

C250钢热变形奥氏体静态再结晶行为

英文标题：Static recrystallization behavior on thermal deformation austenite for C250 steel

作者：戴彦璋韩顺厉勇王春旭尚丽梅杨超

单位：钢铁研究总院有限公司特殊钢研究院中国航发商用航空发动机有限责任公司材料工艺部

分类号：TG142.2

出版年,卷(期):页码：2022,47(11):231-238

摘要：

利用双道次热压缩试验方法，在Gleeble 1500热模拟机上研究了C250马氏体时效钢在热变形时的静态再结晶软化行为。分析了变形温度、应变速率、变形量以及初始奥氏体晶粒尺寸等不同工艺参数对静态再结晶行为的影响，并观察了不同变形条件下的静态再结晶晶粒尺寸变化。基于试验数据，构建了C250钢静态再结晶的动力学模型，得到了C250钢静态再结晶的激活能为146900.1 J·mol-1。试验结果表明：提高变形温度、加快应变速率、增大变形量以及增加道次间隔时间均能有效地增加C250钢的静态再结晶体积分数，其中变形量对静态再结晶体积分数的影响最大，而初始奥氏体晶粒尺寸对其影响较小；不同变形条件下试样的金相组织有显著的静态再结晶现象，且与计算得到的影响趋势相同；基于双道次热压缩试验数据，将静态再结晶动力学模型的预测结果与试验结果进行对比分析，两者较为吻合。

The static recrystallization softening behavior of C250 maraging steel in thermalforming was studied by a two-pass thermal compression test method on thermo-simulation machine Gleeble 1500. Then, the influences of different process parameters, such as deformation temperature, strain rate, deformation amount and inital austenite grain size, on the static recrystallization behavior were analyzed, and the size changes of static recrystallization grains under different deformation conditions were observed. Based on the test data, the kinetic model of static recrystallization for C250 steel was constructed, and the activation energy of static recrystallization for C250 steel was obtained as 146900.1 J·mol-1. The test results show that the volume fraction of static recrystallization for C250 steel can be improved with the increasing of deformation temperature, strain rate, deformation amount and interval time between passes. Among them, the deformation amount has the greatest influence on the volume fraction of static recrystallization, while the grain size of inital austenite has little effect on it. The significant static recrystallization phenomenon in the metallographic structure of specimen in different deformation conditions is observed, and the influence trend is the same as that obtained by calculation. Based on two-pass thermal compression test data, the predicted results of the static recrystallization kinetic model are compared with the test results, and the two are in good agreement.

基金项目：

作者简介：戴彦璋（1998-），男，硕士研究生，E-mail：798273335@qq.com；通信作者：韩顺（1987-），男，博士，高级工程师，E-mail：hanshunfa@126.com

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