Transactions of Materials and Heat Treatment

Title：Relationship between microstructure and fatigue property in a GPa-grade medium carbon δ-TRIP steel

Authors： Xu Xin1 2 Lu Yanpeng1 2 Wang Shu3 Guo Jinyu1 2 Liang Xiao1 2 Su Hongying1 2

Unit： (1.State Key Laboratory of Metal Material for Marine Equipment and Application Anshan 114009 China 2.Ansteel Iron & Steel Research Institute Anshan 114009 China 3. Automotive Steel Marketing and Service Center of Angang Steel Company Limited Anshan 114009 China)

KeyWords： δ-TRIP steel fatigue property residual austenite fracture morphology pre-strain

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2024,49(9):213-219

Abstract：

For a new type of GPa-grade medium carbon δ-TRIP steel, the fatigue tests with a loading frequency of 20 Hz and a cyclic stress ratio Rs of -1 were carried out, and P-S-N curves of the material were obtained at different survival rates. Then, the fracture morphology and crack extension paths of the material were analyzed, and the transformation of residual austenite under the fatigue condition as well as the influence of pre-strain amount on the fatigue properties of δ-TRIP steel were investigated in depth. The results show that the fatigue ultimate strength of the test δ-TRIP steel is about 361 MPa, and its fatigue crack source starts at the junction of parallel section and circular arc, the ductile fracture characteristics in the crack source and expansion area as well as brittle fracture characteristics in the instantaneous fracture area were exhibited. The majority of the residual austenite in the organization undergoes the TRIP effect under the action of external force, a small amount of residual austenite is conducive to improving the fatigue performance of the δ-TRIP test steel, and the pre-deformation affects the fatigue properties of δ-TRIP steel in different degrees. Thus, the larger the decline amount of pre-strain, the larger the degree of fatigue performance.

Funds：

作者简介：徐鑫（1983-），男，博士，正高级工程师 E-mail：ag_xuxin@163.com

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