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The mechanism of internal fatigue-crack initiation and early growth in a titanium alloy with lamellar and equiaxed microstructure
Pan XN(潘向南)1,2; Xu SW(徐守文)1,2; Qian GA(钱桂安)1,2; Alexander N3,4; Andrey S5; Thierry PL6; Hong YS(洪友士)1,2
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
2020-08-14
Volume798Pages:140110
ISSN0921-5093
Abstract

Traditionally, equiaxed α grains rather than lamellar microstructure (LM) domains in titanium alloys are regarded as potential internal crack origins in high-cycle fatigue (HCF) and very-high-cycle fatigue (VHCF) regimes. Here, we found that the fatigue crack is prone to initiate from a large LM domain in a titanium alloy with the composition of LM and equiaxed microstructure (EM) of fine α grains. Then, the mechanisms of internal crack initiation and early growth for the cases of HCF and VHCF under stress ratio R = −1, 0.1 and 0.5 were addressed and a mechanism chart was constructed to illustrate the internal cracking behavior, especially showing that the numerous cyclic pressing process dominates the related microstructure evolution with grain size refinement and nanograin formation underneath the fracture surfaces in the region of crack initiation and early growth.

DOI10.1016/j.msea.2020.140110
Indexed BySCI ; EI
Language英语
Classification一类
Ranking1
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/84717
Collection非线性力学国家重点实验室
中国科学院力学研究所
Corresponding AuthorHong YS(洪友士)
Affiliation1.中国科学院力学研究所
2.中国科学院大学
3.LEME, University Paris Ouest Nanterre La Defense, 50 rue de Serves, Ville-d’Avray, 92410, France
4.MAI – National Research University, 4 Volokolamskoe Hwy, A-80, GSP-3, Moscow, 125993, Russia
5.Aviaregister, Air. Sheremetevo-1, PO Box 54, Moscow Reg, Chimkovskiy State, 141426, Russia
6.Arts et Metiers Institute of Technology, CNRS, Universite de Bordeaux, Bordeaux INP, INRAE, I2M Bordeaux, Esplanade des Arts et Metiers, Talence, 33405, France
Recommended Citation
GB/T 7714
Pan XN,Xu SW,Qian GA,et al. The mechanism of internal fatigue-crack initiation and early growth in a titanium alloy with lamellar and equiaxed microstructure[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2020,798:140110.
APA Pan XN.,Xu SW.,Qian GA.,Alexander N.,Andrey S.,...&Hong YS.(2020).The mechanism of internal fatigue-crack initiation and early growth in a titanium alloy with lamellar and equiaxed microstructure.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,798,140110.
MLA Pan XN,et al."The mechanism of internal fatigue-crack initiation and early growth in a titanium alloy with lamellar and equiaxed microstructure".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 798(2020):140110.
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