High cycle fatigue of isothermally forged Ti-6.5Al-2.2Mo-2.2Zr-1.8Sn-0.7W-0.2Si with different microstructures

IMR OpenIR

	High cycle fatigue of isothermally forged Ti-6.5Al-2.2Mo-2.2Zr-1.8Sn-0.7W-0.2Si with different microstructures
	Zhang, SF; Zeng, WD; Zhao, QY; Gao, XX; Wang, QJ; Zeng, WD (reprint author), Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China.
	2016-12-25
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	689 页码:114-122
摘要	The high cycle fatigue properties of Ti-6.5Al-2.2Mo-2.2Zr-1.8Sn-0.7W-0.2Si with three typical microstructures (equiaxed, bimodal and full lamellar) prepared by carefully controlled isothermal forging and heat treatment procedures are investigated by comparison. Equiaxed and bimodal microstructures exhibit a higher HCF resistance than the full lamellar one and a mismatching of HCF strength with yield strength for equiaxed and bimodal microstructures is observed. Fractography analysis shows crack initiates primarily at the subsurface of similar to 30 mu m-300 mu m for the three microstructures. Interior initiation occurs in 5 specimens of the 19 specimens that were measured. For equiaxed and bi-modal microstructures, the interior initiation samples have significant higher fatigue life than those initiated at (sub) surface under the same fatigue stress, while in lamellar structure, the initiation location shows no such effect on fatigue life. It is found that two factors, i.e. the effective slip length and the intrinsic strength, jointly decide the fatigue crack initiation in the present alloy. The dependence of crack initiation on microstructure is responsible for the microstructural sensitivity of HCF properties. (C) 2016 Elsevier B.V. All rights reserved.
部门归属	[zhang, saifei ; zeng, weidong ; gao, xiongxiong] northwestern polytech univ, state key lab solidificat proc, xian 710072, peoples r china ; [zhao, qinyang] univ manchester, sch mat, manchester m13 9pl, lancs, england ; [wang, qingjiang] chinese acad sci, inst met res, shenyang 110016, peoples r china
关键词	High Cycle Fatigue Ti-6.5al-2.2mo-2.2zr-1.8sn-0.7w-0.2si Equiaxed Microstructure Bi-modal Microstructure Full Lamellar Microstructure
学科领域	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者	Research Fund for the Doctoral Program of Higher Education of China [20116102110015]; New Century Excellent Talents in University [NCET-07-0696]
收录类别	sci
语种	英语
WOS记录号	WOS:000384427200017
引用统计	被引频次：15[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/76151
专题	中国科学院金属研究所
通讯作者	Zeng, WD (reprint author), Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China.
推荐引用方式 GB/T 7714	Zhang, SF,Zeng, WD,Zhao, QY,et al. High cycle fatigue of isothermally forged Ti-6.5Al-2.2Mo-2.2Zr-1.8Sn-0.7W-0.2Si with different microstructures[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2016,689:114-122.
APA	Zhang, SF,Zeng, WD,Zhao, QY,Gao, XX,Wang, QJ,&Zeng, WD .(2016).High cycle fatigue of isothermally forged Ti-6.5Al-2.2Mo-2.2Zr-1.8Sn-0.7W-0.2Si with different microstructures.JOURNAL OF ALLOYS AND COMPOUNDS,689,114-122.
MLA	Zhang, SF,et al."High cycle fatigue of isothermally forged Ti-6.5Al-2.2Mo-2.2Zr-1.8Sn-0.7W-0.2Si with different microstructures".JOURNAL OF ALLOYS AND COMPOUNDS 689(2016):114-122.