Crack initiation mechanism and fatigue life of titanium alloy Ti-6Al-2Sn-2Zr-3Mo-X: Effects of stress ratio and loading frequency

doi:10.1016/j.msea.2020.140265

IMECH-IR > 非线性力学国家重点实验室

	Crack initiation mechanism and fatigue life of titanium alloy Ti-6Al-2Sn-2Zr-3Mo-X: Effects of stress ratio and loading frequency
	Sun CQ(孙成奇); Li YQ ; Huang RX ; Wang L; Liu JL ; Zhou LL(周玲玲); Duan GH(段桂花)
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2020-11-04
卷号	798 页码:140265
ISSN	0921-5093
摘要	In this paper, the fatigue behavior of Ti-6Al-2Sn-2Zr-3Mo-X alloy with basketweave microstructure is investigated at stress ratios R=-1,-0.5, 0.1 and 0.3 and loading frequencies f=0.4 Hz, 4 Hz and 35 Hz. It is shown that the Ti-6Al-2Sn-2Zr-3Mo-X alloy presents two different crack initiation mechanisms. One is due to the cleavage of alpha grains and the other is due to the microstructure inhomogeneity and deformation incompatibility. For the former case, the fracture surface exhibits facet feature in the crack initiation region. For the latter case, the crack nucleates and initiates at alpha grains or interfaces and the fracture surface presents no facet feature in the crack initiation region. The higher stress ratio and the lower frequency tend to induce the higher probability for the occurrence of multiple crack initiation mode. Moreover, the paper indicates that the effect of stress ratio on fatigue life could be expressed as N-f=A [(1-R)/2}(l)sigma(m)(a,R), where A, l and m are material parameters. The scatter of fatigue life is related to both the stress amplitude and the loading frequency. For relative higher stress amplitude, the fatigue life and the frequency at R=-1 could be correlated by a linear relation in log-log scale.
关键词	Ti-6Al-2Sn-2Zr-3Mo-X HIGH-CYCLE FATIGUE Stress ratio TI-6AL-4V Frequency ALPHA Crack initiation mechanism BEHAVIOR Fatigue life FAILURE MICROSTRUCTURE STRENGTH SIZE
DOI	10.1016/j.msea.2020.140265
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000587608800001
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
项目资助者	National Key Research and Development Program of China [2017YFC0305500}
论文分区	一类
力学所作者排名	1
RpAuthor	Sun, CQ
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/85427
专题	非线性力学国家重点实验室
作者单位	1.{Sun Chengqi, Zhou Lingling, Duan Guihua} Chinese Acad Sci Inst Mech State Key Lab Nonlinear Mech Beijing 100190 Peoples R China 2.{Sun Chengqi} Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China 3.{Li Yanqing, Huang Ruxu, Wang Lei} China Ship Sci Res Ctr State Key Lab Deep Sea Manned Vehicles Wuxi 214082 Jiangsu Peoples R China 4.{Liu Jialong} Chinese Acad Sci Inst Geol & Geophys Beijing 100029 Peoples R China
推荐引用方式 GB/T 7714	Sun CQ,Li YQ,Huang RX,et al. Crack initiation mechanism and fatigue life of titanium alloy Ti-6Al-2Sn-2Zr-3Mo-X: Effects of stress ratio and loading frequency[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2020,798:140265.
APA	孙成奇.,Li YQ.,Huang RX.,Wang L.,Liu JL.,...&段桂花.(2020).Crack initiation mechanism and fatigue life of titanium alloy Ti-6Al-2Sn-2Zr-3Mo-X: Effects of stress ratio and loading frequency.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,798,140265.
MLA	孙成奇,et al."Crack initiation mechanism and fatigue life of titanium alloy Ti-6Al-2Sn-2Zr-3Mo-X: Effects of stress ratio and loading frequency".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 798(2020):140265.

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