锻压技术

10钢热变形过程动态再结晶行为

英文标题：Dynamic recrystallization behavior for 10 steel during thermal deformation process

作者：李超群张立文李飞张驰毛培刚

单位：大连理工大学

分类号：TG142.1

出版年,卷(期):页码：2022,47(2):207-212

摘要：

在Gleeble-1500热模拟实验机上进行单道次压缩实验，试样的尺寸为Φ10 mm×15 mm，压缩变形温度为900~1200 ℃，应变速率为0.01~10 s-1，压缩量为63.2%(真应变为1.0)。结果表明：10钢在高温单道次压缩实验过程中应力随着变形温度的升高而降低，随着应变速率的升高而升高，且在热变形过程中发生了动态再结晶现象。在此研究基础上，得到了10钢的动态再结晶临界应变模型；根据真应力-真应变曲线，计算动态再结晶体积分数，构建了10钢动态再结晶动力学模型；根据金相统计晶粒尺寸，建立了10钢动态再结晶晶粒尺寸模型。引入平均相对误差绝对值(AARE)，验证10钢动态再结晶晶粒尺寸方程的拟合效果，得到AARE=6.32%，说明拟合效果良好。

For 10 steel, a single-pass compression test was carried out on the thermal simulator Gleeble-1500，and the size of sample was Φ10 mm×15 mm. The compression deformation temperatures were 900-1200 ℃, the strain rates were 0.01-10 s-1, and the compression amount was 63.2% (the true strain was 1.0). The results show that the stress of 10 steel decreases with the increasing of deformation temperature and increases with the increasing of strain rate during the high-temperature single-pass compression test，and the dynamic recrystallization phenomenon occurres during the thermal deformation of 10 steel. On the basis of this research, the critical strain model of dynamic recrystallization for 10 steel was obtained, according to the true stress-true strain curves，the dynamic recrystallization volume fractions were calculated, and the recrystallization kinetic model of 10 steel was constructed. Furthermore, the dynamic recrystallization grain size model of 10 steel was established，according to the grain sizes measured by the metallographic photos. The average absolute relative error (AARE) was introduced to verify the fitting effect of dynamic recrystallization grain size equation for 10 steel, and the value of AARE was 6.32%, indicating that the fitting effect was good.

基金项目：

国家重点研发计划（2019YFA0705304）；辽宁省自然科学基金资助项目（2019KF0506）

作者简介：李超群（1996-），男，硕士研究生，E-mail：992742661@qq.com；通信作者：张立文（1962-），男，博士，教授，E-mail：commat@mail.dlut.edu.cn

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