Effect of Carbon Content on High Cycle Fatigue Behavior of Twinning-induced Plasticity Steel
SUN Weijie1, LIU Shuai1,*, HUANG Jiulong1, LI Dongdong2, YUAN Zebo3, ZHANG Yan3, FENG Yunli1
1 College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China 2 College of Mechanical Engineering, North China University of Science and Technology, Tangshan 063210, Hebei, China 3 Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063210, Hebei, China
Abstract: In this work, stress-controlled fully reverse tension-compression fatigue tests were carried out to investigate the high cycle fatigue behavior of two different carbon content (0.6C, 1.0C) TWIP steels. The effects of carbon content on the high cycle fatigue properties and microstructure evolution of Fe-Mn-C TWIP steel were analyzed via different scale microscopic characterization. The results show that compared with 0.6C steel, 1.0C steel shows a higher fatigue life and a higher fatigue limit. Microstructure analysis revealed that the number of slip bands and dislocation density of 0.6C steel were higher than those of 1.0C steel. Fatigue cracks tend to initiate at the intersection of soft and hard phase grains and propagate along grain boundaries, annealing twins, and slip bands. Metal inclusions or surface defects near the surface cause stress concentration, which is easy to form fatigue crack source. Carbon plays a role in improving the stacking fault energy in TWIP steel, the lower stacking fault energy of 0.6C steel promotes planar slip of dislocations, leading to accumulation of dislocation pile-ups that trigger crack nucleation. This is the main reason for the reduction of fatigue life in 0.6C steel.
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2025, Vol. 39 
