锻压技术

50Cr5NiMoV支承辊钢热变形行为

英文标题：Hot deformation behavior for 50Cr5NiMoV backup roller steel

单位：1. 太原科技大学机械工程学院山西太原 030024 2. 太原科技大学重型机械教育部工程研究中心山西太原 030024

关键词：50Cr5NiMoV支承辊钢热变形行为热加工图应力三轴度 Arrhenius模型

分类号：TG142.5

出版年,卷(期):页码：2025,50(6):214-220

摘要：

通过单道次压缩实验，系统研究了50Cr5NiMoV支承辊钢在变形温度为950~1150 ℃、应变速率为0.01~1 s-1、变形量为50%条件下的热变形行为。实验结果表明，流变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。基于真应力-真应变曲线，构建了应变补偿的Arrhenius模型，并通过拟合获得了材料常数与应变的多项式关系。此外，针对不同应变水平，构建了耗散效率图和热加工图，结果显示最佳加工区为1075~1150 ℃、0.01~0.22 s-1。在此基础上，分别在热加工图的安全区和失稳区进行了自由锻造仿真。仿真结果表明，失稳区锻造的工件主要表现为三轴拉应力状态，而安全区锻造的工件则主要表现为三轴压应力状态。研究结果为50Cr5NiMoV支承辊钢的热加工工艺优化提供了理论依据和实验支持，具有重要的工程应用价值。

The hot deformation behavior of 50Cr5NiMoV backup roller steel was systematically investigated by single-pass compression tests at the deformation temperature of 950-1150 ℃, the strain rate of 0.01-1 s-1, and the deformation amount of 50%. The test results show that the rheological stress decreases with the increasing of deformation temperature and increases with the increasing of strain rate. Based on the true stress-strain curves, a strain-compensated Arrhenius model was constructed, and the polynomial relationship between material constants and strain was obtained by fitting. In addition, the dissipation efficiency map and hot processing map were constructed for different strain levels, The results show that the optimal processing zone is 1075-1150 ℃ and 0.01-0.22 s-1. On this basis, the free forging simulations were carried out in the safe zone and the unstable zone of the hot processing map, respectively. The simulation results show that the forged workpiece in the unstable zone mainly exhibits a triaxial tensile stress state, while the forged workpiece in the stable region is mainly subjected to a triaxial compressive stress states. Thus, the research results provide a theoretical basis and test support for the optimization of the hot processing process of 50Cr5NiMoV backup roller steel, which has significant engineering application value.

基金项目：

山西省基础研究计划（202303011211004，TZLH20230818001）；国家自然科学基金资助项目（52375364）；太原科技大学科研启动基金（20242041，20242094）；山西省高等教育科技创新计划（2024L211）

作者简介：鲁一波（1999-），男，硕士研究生，E-mail：yibo_lu@163.com；通信作者：李玉贵（1967-），男，博士，教授，E-mail：lygtykd@163.com

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