The behavior of crack initiation and early growth in high-cycle and very-high-cycle fatigue regimes for a titanium alloy

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	The behavior of crack initiation and early growth in high-cycle and very-high-cycle fatigue regimes for a titanium alloy
	Pan XN(潘向南); Su H(苏杭); Sun CQ(孙成奇); Hong YS(洪友士)
会议录名称	INTERNATIONAL JOURNAL OF FATIGUE
	2018-10-01
页码	67-78
会议名称	4th IJFatigue and FFEMS Joint Workshop on Characterisation of Crack Tip Fields
会议日期	APR 10-12, 2017
会议地点	Bonifacio, FRANCE
摘要	The behavior of crack initiation and early growth in high-cycle fatigue (HCF) and very-high-cycle fatigue (VHCF) regimes for a TC4 titanium alloy with equiaxed microstructure was investigated. Fatigue tests were conducted via ultrasonic axial cycling (20 kHz) superimposed by an amount of tensile load. The effect of tensile mean stress on fatigue endurance was plotted with a Haigh diagram formulated by Goodman, Gerber and the present formula. Fractography was observed by scanning electron microscopy, and three failure types of crack initiation were classified: surface-without-RA (rough area), surface-with-RA and interior-with-RA. Profile samples from the crack initiation region were prepared and examined by transmission electron microscopy with selected area electron diffraction. The observations show that a nanograin layer prevails underneath the fracture surface in the RA region only for the VHCF case with a stress ratio R = -1. The nanograin formation mechanism was explained by the numerous cyclic pressing (NCP) model.
关键词	Very-high-cycle fatigue Crack initiation Mean stress Titanium alloy Equiaxed microstructure
WOS记录号	WOS:000449895700009
资助信息	National Natural Science Foundation of China [11572325]; Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22040503, XDB22020201]
收录类别	CPCI-S
语种	英语
引用统计	被引频次：55[WOS] [WOS记录] [WOS相关记录]
文献类型	会议论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/78556
专题	非线性力学国家重点实验室
作者单位	Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China、Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Pan XN,Su H,Sun CQ,et al. The behavior of crack initiation and early growth in high-cycle and very-high-cycle fatigue regimes for a titanium alloy[C]INTERNATIONAL JOURNAL OF FATIGUE,2018:67-78.

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