摘要
采用Gleeble-1500D热模拟实验机,对Fe-27.51Mn-8.69Al-1.12C低密度钢在变形温度为900~1100℃和应变速率为0.01~5 s^(-1)范围内进行热压缩实验,通过实验数据分析了该钢的流动应力曲线特征,建立了考虑应变耦合的物理本构模型,并进行了验证分析。结果表明:变形温度和应变速率等热力学条件对低密度钢的流动应力影响较为显著,高温、低应变速率更有利于低密度钢的再结晶发生;基于峰值应力的低密度钢等温压缩物理本构方程的预测精度较高,其线性拟合相关系数为0.991;基于应变补偿的低密度钢等温压缩物理本构方程能够较好地描述其在热压缩条件下的流动应力变化规律,其相关系数r为0.980,预测值与实验值的平均相对误差AARE为6.9%。
The thermal compression experiment of Fe-27.51Mn-8.69Al-1.12C low density steel under the temperature of 900-1100℃and the strain rate of 0.01-5 s^(-1) was carried out by thermal simulation experiment machine Gleeble-1500D,and the rheological stress curves characteristics of the steel were analyzed by the experimental data.Then,the physical constitutive model considering strain coupling was established,and the verification analysis was conducted.The results show that the thermodynamic conditions such as deformation temperature and strain rate have significant effects on the rheological stress of low density steel,and the high temperature and low strain rate are more conducive to the recrystallization of low density steel.The prediction accuracy of physical constitutive equation for low density steel under isothermal compression based on peak stress is high,and the linear fitting correlation coefficient is 0.991.The physical constitutive equation of low density steel under isothermal compression based on strain compensation can better describe the change rule of rheological stress for low density steel under hot compression,the correlation coefficient r is 0.980,and the average relative error AARE between the predicted and experimental values is 6.9%.
作者
孙建
程锐
王梓
李景辉
黄贞益
Sun Jian;Cheng Rui;Wang Zi;Li Jinghui;Huang Zhenyi(School of Metallurgical Engineering,Anhui University of Technology,Ma′anshan 243002,China;School of Mechanical Engineering,Tongling University,Tongling 244061,China;Key Laboratory of Construction Hydraulic Robots of Anhui Province Higher Education Institutes,Tongling 244061,China;New Copper-based Material Industry Generic Technology Research Center of Anhui Province,Tongling 244061,China;Key Laboratory of Additive Manufacturing of Tongling City,Tongling 244061,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2023年第6期214-222,共9页
Forging & Stamping Technology
基金
国家自然科学基金资助项目(51674004,51805002)
安徽省高等学校自然科学研究重点项目(2022AH051760)
铜陵学院自然科学研究项目(2017tlxy23)
国家级本科生创新训练项目(202210383086)
铜陵学院大学生科研基金项目(2021tlxydxs099)
工程液压机器人安徽普通高校重点实验室开放课题资助(TLXYCHR-O-21YB03)
铜陵学院横向科研项目(2023tlxyxdz077)。
关键词
低密度钢
等温压缩
应变补偿
物理本构方程
流动应力
low density steel
isothermal compression
strain compensation
physical constitutive equation
rheological stress