锻压技术

70Cr3Mo钢热变形行为及加工图

英文标题：Hot deformation behavior and processing map of 70Cr3Mo steel

作者：王园园陈拂晓陈学文

分类号：TG301

出版年,卷(期):页码：2014,39(3):117-122

摘要：

采用Gleeble-1500热模拟实验机研究了70Cr3Mo钢在不同变形条件下的高温压缩热变形行为，变形温度850~1150 ℃, 应变速率0.01~10 s-1。依据实验数据，分析了应力、应变间的关系，建立了流变应力本构方程和加工图。由应力、应变曲线可以得出：变形温度一定时，应力峰值随着应变速率的增加而增加；应变速率一定时，应力峰值随变形温度的增加而降低。计算分析了真应变为0.5的加工图，结果表明，70Cr3Mo钢在热压缩过程中存在两个失稳区：（1）变形温度为850~940 ℃、应变速率为0.01~1.6 s-1；（2）变形温度为975~1150 ℃、应变速率为1~10 s-1。并获得了最佳的工艺参数：变形温度为1000~1150 ℃、应变速率为0.01~0.36 s-1。

The hot compression deformation behaviors of 70Cr3Mo steel were studied in the different deformation conditions on Gleeble-1500 thermo-simulation machine, the temperature range was 850-1150 ℃, and the strain rate was 0.01-10 s-1. According to the experimental data, the relationship between the stress and strain was analyzed, and the constitutive equations and the processing map were established. By the stress-strain curve, the peak stress increased with the increase of strain rate under the given compression temperature, and the peak stress decreased with the increase of deformation temperature under the given strain rate. The processing map calculated and analysed at the true strain of 0.5 shows that there are two instability zones of hot deformation for 70Cr3Mo steel，including the zone in the deformation temeratpure range of 850-940 ℃ and the strain rate range of 0.01-1.6 s-1 , and another zone in the temperature range of 975-1150 ℃ and the strain rate range of 1-10 s-1. The obtained optimum technology parameters are temperature range of 1000-1150 ℃ and strain rate range of 0.01-0.36 s-1.

基金项目：

国家自然科学基金资助项目（51105132）

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