Study on Low-cycle Fatigue Performance of Pure Titanium with Bimodal Structure: Experiment and Simulation

doi:10.3901/JME.2024.12.228

Abstract

Abstract: The bimodal-grained distribution was introduced into the microstructure of pure titanium through cryo-rolling combined with annealing heat treatment. The tensile properties and low-cycle fatigue properties of bimodal pure titanium (BM-Ti) were systematically studied. Compared to the original coarse-grained pure titanium (CG-Ti) and ultra-fine grained pure titanium (UFG-Ti), BM-Ti exhibited excellent strength-ductility matching properties with high yield strength (634.4 MPa) and high uniform elongation (7.2%). The results of low-cycle fatigue experiments indicate that the bimodal structure cannot effectively improve the fatigue life of pure titanium. During the cycling process, the coarse-grained area of BM-Ti bore most of the plastic deformation, and a large number of dislocations accumulated within coarse grains, gradually dividing the grains and leading to the refinement of coarse grains. The low-cycle fatigue behavior of BM-Ti was simulated by crystal plasticity finite element method, and accumulated plastic strain was introduced to evaluate the damage during the fatigue process. It was found that the heterogeneous interface of BM-Ti is more prone to fatigue crack initiation due to strain incompatibility.

Key words: bimodal structure, strength-ductility trade-off, low-cycle fatigue, fatigue crack initiation

CLC Number:

TG113

TANG Pei, ZHANG Yong, JIA Yunfei, LI Xiao, WANG Yongji. Study on Low-cycle Fatigue Performance of Pure Titanium with Bimodal Structure: Experiment and Simulation[J]. Journal of Mechanical Engineering, 2024, 60(12): 228-239.

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