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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
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume689Pages:114-122
AbstractThe 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.
description.department[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
KeywordHigh Cycle Fatigue Ti-6.5al-2.2mo-2.2zr-1.8sn-0.7w-0.2si Equiaxed Microstructure Bi-modal Microstructure Full Lamellar Microstructure
Subject AreaChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationResearch Fund for the Doctoral Program of Higher Education of China [20116102110015]; New Century Excellent Talents in University [NCET-07-0696]
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/76151
Collection中国科学院金属研究所
Corresponding AuthorZeng, WD (reprint author), Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China.
Recommended Citation
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.
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