Transactions of Materials and Heat Treatment

Title：Tensile deformation behavior and plastic damage evolution law of EA4T axle steel at high temperature

Authors： Bian Zhiyuan Huo Yuanming He Tao Bai Jie Ren Xu Du Xiangyang

Unit： Shanghai University of Engineering Science

KeyWords： axle steel of high-speed railway EA4T axle steel high temperature tensile fracture morphology microstructure plastic damage

ClassificationCode：TG115.21

year,vol(issue):pagenumber：2023,48(2):224-232

Abstract：

In order to study the mechanical properties, microstructure and plastic damage evolution law of EA4T axle steel during high temperature tensile, the high temperature tensile tests of smooth and notched round bars were carried out on the thermal simulation test machine Gleeble-3800. The test temperature was 970, 1070 and 1170 ℃, the strain rates was 0.1, 1.0 and 10.0 s-1, and the notched round bar samples with the notched radius of 15, 10 and 5 mm respectively had different stress triaxialities. The results show that the fracture strain of EA4T axle steel decreases with the increasing of temperature and increases with the increasing of strain rate during high temperature deformation. With the increasing of stress triaxiality, the average fracture strain shows a decreasing trend, and the number and size of microvoids in the microstructure are larger. The dynamic recrystallization process hinders the growth and aggregation of microvoids. As the degree of recrystallization deepens, the microvoids change from wide oval to slender shuttle, and the average size decreases, and the elongation direction of the microvoids points to the center of the section shrinkage. Thus, the elongated microvoids cause the section to form a deep equiaxed dimple.

Funds：

国家重点研发计划资助（2018YFB1307900）

作者简介：卞志远（1997-），男，硕士研究生，E-mail：bian_zhiyuan2020@163.com；通信作者：霍元明（1984-），男，博士，副教授，E-mail：yuanming.huo@sues.edu.cn

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