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Toward an understanding of dwell fatigue damage mechanism of bimodal Ti-6Al-4V alloys
Zeng, L. R.1,2; Lei, L. M.3; Luo, X. M.1; Zhang, G. P.1
Corresponding AuthorZhang, G. P.(gpzhang@imr.ac.cn)
2022-05-10
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume108Pages:244-255
AbstractDwell fatigue effect is a long-standing problem threatening the long-term service reliability for fan blades and fan disks of an aircraft engine. To understand the basic mechanism of dwell fatigue damage, pure fatigue and 60 s dwell fatigue properties of bimodal Ti-6Al-4V alloys with different volume fractions of the primary alpha (alpha(p)) phase were examined comparatively. The results showed that both pure fatigue and dwell fatigue life decreased with increasing the volume fraction of the alpha(p) phase and the dwell fatigue life was lower than the pure fatigue one. The quasi-in-situ test results and the quantitative characterization of damage behaviors of the local microstructure units defined by the alpha(p)-secondary alpha (alpha(s)) combination reveal that the alpha(s) phase close to the alpha(p) phase with extensively slip activities was gradually damaged under dwell fatigue loading, while that under pure fatigue loading was undamaged, demonstrating that the dwell loading induced the damage of the alpha(s) phase, and further reduced the fatigue life. A stress relaxation-based model is proposed to describe the physical mechanism on dwell fatigue damage of the bimodal Ti-6Al-4V alloy, i.e. the elastic deformation of the alpha(s) phase caused by the strain incompatibility would be gradually transformed into plastic deformation during the dwell stage, and thus promotes fatigue damage. The model provides new insights into the microscopic process of stress/strain transfer between the soft and hard microstructure units under dwell fatigue loading. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KeywordDwell effect Fatigue damage Stress relaxation Volume fraction of primary alpha phase Quasi-in-situ testing
Funding OrganizationNational Natural Science Foundation of China ; Fundamental Research Project of Shenyang National Laboratory for Materials Science
DOI10.1016/j.jmst.2021.08.041
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51771207] ; National Natural Science Foundation of China[52171128] ; Fundamental Research Project of Shenyang National Laboratory for Materials Science[L2019R18]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000787716200006
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/172645
Collection中国科学院金属研究所
Corresponding AuthorZhang, G. P.
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
2.Chengdu Univ, Sch Mech Engn, Chengdu 610106, Peoples R China
3.AECC Shanghai Commercial Aircraft Engine Mfg Co L, Shanghai 201306, Peoples R China
Recommended Citation
GB/T 7714
Zeng, L. R.,Lei, L. M.,Luo, X. M.,et al. Toward an understanding of dwell fatigue damage mechanism of bimodal Ti-6Al-4V alloys[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2022,108:244-255.
APA Zeng, L. R.,Lei, L. M.,Luo, X. M.,&Zhang, G. P..(2022).Toward an understanding of dwell fatigue damage mechanism of bimodal Ti-6Al-4V alloys.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,108,244-255.
MLA Zeng, L. R.,et al."Toward an understanding of dwell fatigue damage mechanism of bimodal Ti-6Al-4V alloys".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 108(2022):244-255.
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