Transactions of Materials and Heat Treatment

Title：High-temperature constitutive equation of SA508-3 steel based on friction correction

Authors： Wu Jianguo An Hongping Liu Lili Li Qiushu

Unit： Taiyuan University of Science and Technology

KeyWords： hot compression true stress constitutive equation friction correction SA508-3 steel

ClassificationCode：TG142；TG115

year,vol(issue):pagenumber：2020,45(12):178-182

Abstract：

Hot compression experiments for SA508-3 steel were carried out by thermal-mechanical simulator Gleeble-1500D with the temperature of 1073-1473 K and the strain rate of 0001-1 s-1, and the stress-strain curves of SA508-3 steel were obtained under the given deformation conditions. Then, the deformed specimen sizes were evaluated by expansion coefficient. And the data show that the friction has obvious effect on the hot compression deformation of specimens. Due to obvious friction effect，the stress obtained from the experiment can not accurately represent the true stress of material, and the experimental data were modified by the deformation work method. The results show that the stress-strain curves before and after friction correction have the same changing trend, and the modified stress value is always smaller than the experimental stress value. With the increasing of deformation degree, the difference between modified and experimental stress values increases. According to the modified stress-strain curves, the hyperbolic sine constitutive equation of SA508-3 steel is determined by data fitting, and the accuracy of the constitutive equations is verified by the average absolute relative deviation of 626% and the relative coefficient of 0998.

Funds：

山西省自然科学基金重点项目（201601D011002）

武建国（1975-），男，博士研究生 E-mail：wjgzz951@126com 通讯作者：李秋书（1960-），男，博士，教授 E-mail: liqiushu@tyusteducn

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