EFFECTS OF MICROSTRUCTURE AND STRESS RATIO ON HIGH-CYCLE AND VERY-HIGH-CYCLE FATIGUE BEHAVIOR OF Ti-6Al-4V ALLOY

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	EFFECTS OF MICROSTRUCTURE AND STRESS RATIO ON HIGH-CYCLE AND VERY-HIGH-CYCLE FATIGUE BEHAVIOR OF Ti-6Al-4V ALLOY
	Liu XL; Sun CQ(孙成奇); Zhou YT; Hong YS(洪友士)
刊名	ACTA METALLURGICA SINICA
	2016
通讯作者邮箱	hongys@imech.ac.cn
卷号	52 期号:8 页码:923-930
关键词	Ti-6Al-4V alloy very-high-cycle fatigue microstructure stress ratio slip mechanism cleavage mechanism
ISSN号	0412-1961
通讯作者	Hong, YS (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
产权排序	[Liu Xiaolong; Sun Chengqi; Hong Youshi] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; [Zhou Yantian] Wafangdian Bearing Co Ltd, Heat Treatment Plant, Dalian 116300, Peoples R China
中文摘要	Titanium alloys have been widely used as superior engineering materials because of their high specific strength, high temperature resistance and high corrosion resistance. In their engineering applications such as used in aircraft engines, titanium alloys may experience even 10(10) fatigue cycles. Recently, faceted crack initiation was observed in high-cycle fatigue (HCF) and very-high-cycle fatigue (VHCF) regimes of titanium alloys, which resulted in a sharp decrease in fatigue strength. Therefore, the HCF and VHCF of titanium alloys have both scientific significance and engineering requirement. In this work, the effects of microstructure and stress ratio (R) on HCF and VHCF of a Ti-6Al-4V alloy have been investigated. Fatigue tests were conducted on a rotating-bending fatigue machine and an ultrasonic fatigue machine. All the fatigue fracture surfaces were observed by SEM. The results show that the HCF and VHCF behaviors of the fully-equiaxed and the bimodal Ti-6Al-4V alloy are similar. The observations of fracture surface indicate that two crack initiation mechanisms prevail, i.e. slip mechanism and cleavage mechanism. With the increase of stress ratio, the crack initiation mechanism switches from slip to cleavage. The S-N curves present the single-line type or the bilinear type. For the cases of rotating-bending and ultrasonic axial cycling with R= -1.0, -0.5 and 0.5, the S-N curves are single-line type corresponding to the slip mechanism or cleavage mechanism. For the cases of R= -0.1 and 0.1, the S-N curves are bilinear type corresponding to both slip and cleavage mechanisms. A model based on fatigue life and fatigue limit is proposed to describe the competition between the two mechanisms, which is in agreement with the experimental results.
分类号	二类
类目[WOS]	Metallurgy & Metallurgical Engineering
研究领域[WOS]	Metallurgy & Metallurgical Engineering
关键词[WOS]	Ti-6Al-4V alloy ; very-high-cycle fatigue ; microstructure ; stress ratio ; slip mechanism ; cleavage mechanism
收录类别	SCI ; EI
原文出处	http://dx.doi.org/10.11900/0412.1961.2015.00581
语种	英语
WOS记录号	WOS:000381541900004
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/59745]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Liu XL,Sun CQ,Zhou YT,et al. EFFECTS OF MICROSTRUCTURE AND STRESS RATIO ON HIGH-CYCLE AND VERY-HIGH-CYCLE FATIGUE BEHAVIOR OF Ti-6Al-4V ALLOY[J]. ACTA METALLURGICA SINICA,2016,52(8):923-930.
APA	Liu XL,孙成奇,Zhou YT,&洪友士.(2016).EFFECTS OF MICROSTRUCTURE AND STRESS RATIO ON HIGH-CYCLE AND VERY-HIGH-CYCLE FATIGUE BEHAVIOR OF Ti-6Al-4V ALLOY.ACTA METALLURGICA SINICA,52(8),923-930.
MLA	Liu XL,et al."EFFECTS OF MICROSTRUCTURE AND STRESS RATIO ON HIGH-CYCLE AND VERY-HIGH-CYCLE FATIGUE BEHAVIOR OF Ti-6Al-4V ALLOY".ACTA METALLURGICA SINICA 52.8(2016):923-930.