锻压技术

Fe-2Cu-0.5C粉末烧结钢高温拉伸流动应力及预测

英文标题：Flow stress and prediction on powder sintered steel Fe-2Cu-0.5C during high temperature tensile

作者：李强郭彪吴辉敖进清李肖张羽

分类号：TF124.8

出版年,卷(期):页码：2020,45(8):195-204

摘要：

在变形温度为 850~1000 ℃、应变速率为 0.1~10 s-1条件下，通过 Gleeble-3500 热模拟试验机，对Fe-2Cu-0.5C粉末烧结钢进行了高温拉伸测试，并通过有限元模拟修正了测得的真应力-真应变曲线，分析了粉末烧结钢的高温拉伸变形行为，并建立了本构方程预测其高温拉伸流动应力。结果表明：有限元模拟能够有效地修正高温拉伸真应力-真应变曲线，最大限度地减小由样品温度梯度带来的误差。修正后的流动应力在变形初始阶段随应变的增加迅速增大；之后，随着应变的继续增加，流动应力增速减缓，达到峰值后趋于平稳直至试样断裂。建立了具有较高预测精度的Fe-2Cu-0.5C粉末烧结钢高温拉伸流动应力本构方程。本构方程的流动应力预测值与修正值吻合较好，相关系数为0.99801，平均绝对相对误差为0.92%。

Under the deformation temperature of 850-1000 ℃ and the strain rate of 0.1-10 s-1, the high temperature tensile tests of powder sintered steel Fe-2Cu-0.5C were conducted by thermal simulation tester Gleeble-3500, and the measured true stress-true strain curve was revised by finite element simulation. Then, the high temperature tensile deformation behaviors of powder sintered steel were studied, and the constitutive equation predicting the high temperature tensile flow stress was established. The results show that the finite element simulation effectively revises the true stress-true strain curves during high temperature tensile and minimizes the error caused by temperature gradient of specimen. The revised flow stress increases rapidly with the increasing of strain at the initial stage of deformation, then, with the successive increasing of strain, the increasing of flow stress slows down, and after reaching a peak, the flow stress tends to be stable until the fracture of specimen. Furthermore, the constitutive equation of flow stress for powder sintered steel Fe-2Cu-0.5C during high temperature tensile with high prediction accuracy is established, and the predicted flow stress values of constitutive equation are in good agreement with the revised values under the correlation coefficient of 0.99801 and the average absolute relative error of 0.92%.

基金项目：

国家自然科学基金资助项目（51504197）；四川省科技厅重点研发计划项目（19ZDYF0880）；教育部春晖计划项目（Z2015097）；四川省粉末冶金工程技术研究中心开放基金项目（SC-FMYJ2018-04）；西华大学“青年学者后备人才”支持计划项目；西华大学研究生创新基金项目（SA1900009552）

李强（1995-），男，硕士研究生，E-mail：1175248648@qq.com；通讯作者：郭彪（1984-），男，博士，副教授，E-mail：biaoguo_mse@126.com

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