30CrNi3A调质钢高温变形过程峰值应力预测

Peak Stress Prediction of 30CrNi3A Quenched and Tempered Steel During High Temperature Deformation

以机械产品用30CrNi3A调质钢为研究对象,在变形温度为800~1100℃,应变速率为0.1~40/s的条件下通过热模拟试验机对其进行高温压缩实验,并对实验所得该试样的应力-应变曲线进行分析。以实验所得数据为基础,建立在高温变形过程中该金属材料流变峰值应力的本构方程,并通过所建立的方程预测其峰值应力,同时将预测所得结果与实测值进行比较。结果表明,通过双曲余弦本构方程预测所得峰值应力值与实测值最接近,相对误差的均值小于4.1%,预测效果比较理想。

Taking the 30CrNi3A steel used for mechanical products as the research object, the high temperature compression test was conducted by thermal simulation testing machine under the condition of deformation temperature was 800-1 100 ℃ and the strain rate was 0.1-40/s, and the stress-strain curves of the specimens were analyzed. Based on the experimental data, the constitutive equation of the metal material flow peak stress during high temperature deformation was established. At the same time, the peak stress was predicted through the established equation. And the prediction results were compared with the measured value. The results show that the calculated peak stress value is close to the measured value, and the mean value of the relative error is less than 4.1%. The predicted result is better than that of the measured value.