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Abstract：
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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%.
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Funds：
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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）
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AuthorIntro：
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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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Reference：
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