摘要
对20MnTiB冷镦钢进行了变形温度为1173~1373 K、应变速率为0.01~10 s-1、变形量为60%的热压缩实验,研究其热变形行为。结果表明:20MnTiB冷镦钢的真应力随着应变的增大呈现先快速上升而后上升速率逐步减缓,最终达到动态稳定的趋势。通过实验数据分析,构建了应变补偿型Arrhenius模型和改进的Johnson-Cook模型,并对其在预测20MnTiB冷镦钢高温变形行为中的精度进行了比较。研究表明,两种模型的线性相关系数分别达到0.989和0.983,平均绝对误差分别为4.49%和4.43%。此外,基于应变补偿型Arrhenius模型的本构方程,并结合动态材料模型,构建了20MnTiB冷镦钢的热加工图。分析结果显示,利用热加工图获得的最佳加工区域为:变形温度范围为1223~1293 K、应变速率范围为0.01~0.1 s-1,得到的显微组织与分析结果吻合较好。
A thermal compression experiment was carried out on 20MnTiB cold heading steel with the deformation temperature of 11731373 K,the strain rate of 0.0110 s-1 and the deformation amount of 60%to study its hot deformation behavior.The results show that the true stress of 20MnTiB cold heading steel specimens show a rapid increase with the increasing of strain,and then the rate of increase gradually slows down and finally reaches a dynamic stable state.Through the analysis of experimental data,the strain-compensated Arrhenius model and the improved Johnson-Cook model were constructed,and their accuracy in predicting the high-temperature deformation behavior of 20MnTiB cold heading steel was compared.The study shows that the linear correlation coefficients for the two models reach 0.989 and 0.983,respectively,and their mean absolute relative errors are 4.49%and 4.43%.In addition,based on the constitutive equations of the strain-compensated Arrhenius model and combined with the dynamic material model,the hot processing map of 20MnTiB cold heading steel was constructed.The analysis results show that the optimum processing region obtained using the hot processing map is in the deformation temperature range of 12231293 K,and the strain rate range of 0.01-0.1 s-1,and the microstructures obtained are in good agreement with the analysis results.
作者
佘佩炎
徐东
王艳辉
郭龙鑫
李洋
郑冰
She Peiyan;Xu Dong;Wang Yanhui;Guo Longxin;Li Yang;Zheng Bing(Hebei High Quality Cold Heading Steel Technology Innovation Center,Hebei University of Engineering,Handan O56038,China;Hebei University R&D Center of High-end Fastener Application Technology for the Whole Process,Hebei Taihang Iron and Steel Group Co.,Ltd.,Handan O56305,China;Hebei Province High Toughness Wind Tower Steel Engineering Research Center,Hebei Puyang Iron and Steel Group,Handan 056305,China;Meson Technology(Hebei)Co.,Ltd.,Handan 056000,China)
出处
《锻压技术》
2026年第2期248-258,共11页
Forging & Stamping Technology
基金
河北省中央引导地方科技发展资金项目(246Z1009G,254Z1010G)
河北省高等学校科学技术研究项目资助(CXY2023004)
河北省省级科技计划资助基础研究专项概念验证项目(E2024402143)。
关键词
20MnTiB冷镦钢
高温热变形行为
流变应力
本构模型
热加工图
20MnTiB cold heading steel
high-temperature deformation behavior
rheological stress
constitutive model
hot processing map
