锻压技术

34CrNi3MoV钢的热变形行为

英文标题：Thermal deformation behavior on 34CrNi3MoV steel

单位：1. 河北工程大学河北省高品质冷镦钢技术创新中心 2. 河南中原特钢装备制造有限公司 3. 辽宁科技大学材料与冶金学院 4. 河北普阳钢铁有限公司河北省高韧性风塔钢工程研究中心 5. 河北普阳钢铁有限公司河北省高塑韧性耐磨钢板技术创新中心

关键词：34CrNi3MoV钢等温压缩流变应力本构方程应变补偿

分类号：TG142.1

出版年,卷(期):页码：2023,48(3):211-218

摘要：

为分析34CrNi3MoV钢的热变形行为，采用Gleeble-1500热模拟试验机进行等温热压缩试验，设置变形温度为800~1200 ℃、应变速率为0.01~10 s-1，获得相应的流变应力曲线。分析了流变应力对变形参数的敏感性，计算了不同应变量下材料参数α、n、Q和A的值，并利用五阶多项式拟合了各材料参数与应变量的对应关系。采用应变补偿的Arrhenius模型对34CrNi3MoV钢的高温流动应力本构方程进行回归。结果表明：34CrNi3MoV钢在变形温度为1000 ~ 1200 ℃、应变速率为0.01 ~ 1 s-1 时出现较为明显的动态再结晶曲线特征，并随着应变速率的降低和变形温度的升高，峰值应力越明显。本构方程预测的流动应力与试验结果的吻合度较好，在整个试验范围内的平均相对误差Rav仅为5.52%，表明所构建的模型是可靠的。

In order to analyze the thermal deformation behavior of 34CrNi3MoV steel, the isothermal thermal compression tests were conducted on Gleeble-1500 thermo-mechanical simulator with the deformation temperature of 800-1200 ℃ and the strain rate of 0.01-10 s-1, the corresponding rheological stress curves were obtained. Then, the sensitivity of rheological stress to deformation parameters was analyzed, and the values of material parameters α, n, Q and A under different strain amounts were calculated. Furthermore, the corresponding relationship between each material parameter and strain amount was fitted by the fifth-order polynomial, and the high-temperature rheological stress constitutive equation of 34CrNi3MoV steel was regressed by the strain-compensated Arrhenius model. The results show that the dynamic recrystallization curve characteristics of 34CrNi3MoV steel is obvious when the temperature is 1000-1200 ℃ and the strain rate is 0.01-1 s-1, and the peak stress becomes more obvious with the decreasing of strain rate and the increasing of deformation temperature. The rheological stress predicted by the constitutive equation has a high agreement with the test results, and the average relative error Rav in the entire test range is only 5.52%, which indicates that the constructed model is reliable.

基金项目：

国家自然科学基金联合基金资助项目 (NSFC)(U20A20272)；河北省军民科技协同创新专项(22351001D)；邯郸市科学研究计划重点项目(21122015004)；河北省高等学校科学技术研究项目(CXY2023004)

作者简介：邹志鹏 (1987-)，男，硕士研究生 E-mail： zzp9963@163.com 通信作者：徐东 (1984-)，男，博士，教授，博士生导师 E-mail：xudong_xyz@163.com34CrNi3MoV

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