High cycle fatigue and fatigue crack propagation behaviors of β-annealed Ti-6Al-4V alloy

被引：30
作者：
Jeong D. [1 ]
Kwon Y. [2 ]
Goto M. [3 ]
Kim S. [1 ]
机构：
[1] Department of Materials Engineering and Convergence Technology, ReCAPT, Gyeongsang National University, Jinju
[2] Department of Materials Processing, Korea Institute of Materials Science, Changwon
[3] Department of Mechanical Engineering, Oita University, Oita
来源：
International Journal of Mechanical and Materials Engineering | 2017年 / 12卷 / 1期
基金：
新加坡国家研究基金会;
关键词：
Fatigue; Fatigue crack propagation; High cycle fatigue; Microstructure; Ti-6Al-4; V; β-annealing;
D O I：
10.1186/s40712-016-0069-8
中图分类号：
学科分类号：
摘要：
Background: The effect of β annealing on high cycle fatigue (HCF) and fatigue crack propagation (FCP) behaviors of Ti64 alloy were examined, and the results were compared to those of mill-annealed counterpart. Methods: The tensile tests, stress-controlled HCF tests, and FCP tests were conducted, and the fractographic and micrographic analyses were performed before and after the tests. Results: The β-annealed Ti64 specimen showed inferior HCF properties as compared to the mill-annealed counterpart, as a result of lower yield strength. On the other hand the resistance to FCP of β-annealed Ti64 specimen was higher than that of mill-annealed counterpart in low and intermediate ΔK regime. Conclusions: Relatively easy fatigue crack initiation at the colony boundaries of β-annealed Ti64 specimen reduce the resistance to HCF. The resistance to FCP of β-annealed Ti64 specimen increased significantly particularly in low ΔK regime along with severe crack branching and deflection. © The Author(s).
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