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Effect of Pre-Tension on the Fatigue Fracture of Under-Aged 7N01 Aluminum Alloy Plate
Tian Ni1,2; Shi Xu1; Liu Wei1; Liu Chuncheng3; Zhao Gang1,2; Zuo Liang2,4
Corresponding AuthorTian Ni(tiann@atm.neu.edu.cn)
2022-06-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume58Issue:6Pages:760-770
Abstract7N01 aluminum alloy is the main load-bearing structure material for bullet train bodies due to its high specific strength, high specific stiffness, good magnetic-shielding ability, strong corrosion resistance, and good formability and weldability. The fatigue performance of materials and components used in bullet trains determines their security. It is unavoidable that there is pre-deformation during the assembly process of aluminum alloy components, which will influence the active service and fatigue performance of the aluminum alloy. It is important not only to clarify the relationship between pre-deformation and fatigue performance but also to reveal the mechanism of pre-deformation on the fatigue fracture of 7N01 aluminum alloy, to ensure the security of the bullet train. In this study, the effect of pre-tensile deformation on the fatigue property, fatigue fracture initiation, and fatigue crack propagation characteristics of a commercial 7N01 aluminum alloy plate at under-aged conditions was studied using tensile and fatigue tests combined with microstructure analysis. As the pre-tensile deformation increased to 20%, the results showed that the shape, size, number, distribution of second phase particles, as well as the size and morphology of thin strips grain of under-aged 7N01 aluminum alloy plate were almost the same. However, the under-aged 7N01 aluminum alloy plate has a significant strain-hardening effect after pre-tensile at room temperature, with the yield strength, tensile strength, and hardness increased from 181 MPa, 233 MPa, and 95 HV (without pre-tensile deformation) to 254 MPa, 271 MPa, and 117 HV (after 20% pretensile deformation), while the elongation decreased from 23.2% to 5.2%. Under the 175 MPa pulsating tensile load condition (stress ratio R = 0), the overall fatigue life of the under-aged 7N01 aluminum alloy plate first reduced, then prolonged, and then decreased as pre-tensile deformation increased. Without pre-tensile deformation, the fatigue life of under-aged 7N01 aluminum alloy plate is about 6.06 x 10(5) cyc, and when prolonged by about 75%, it reaches about 1.06 x 10(6) cyc after 5% pre-tensile deformation. However, the fatigue life of the under-aged 7N01 aluminum alloy plate is decreased to 4.21 x 10(5) and 2.89 x 10(5) cyc after 3% and 20% pre-tensile deformation, respectively. The evenly distributed highdensity dislocations or dislocation cells resulted in 5%-16% pre-tensile deformation in the under-aged 7N01 aluminum alloy plate, which can prolong the fatigue life of the alloy plate by over 23%.
Keyword7N01 aluminum alloy plate pre-tensile deformation under-aged dislocation fatigue
Funding OrganizationNational Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities of China ; Natural Science Foundation of Liaoning Province
DOI10.11900/0412.1961.2021.00017
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51871043] ; Fundamental Research Funds for the Central Universities of China[180212010] ; Natural Science Foundation of Liaoning Province
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000799262400004
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/174108
Collection中国科学院金属研究所
Corresponding AuthorTian Ni
Affiliation1.Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China
2.Northeastern Univ, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Peoples R China
3.Northeastern Univ, Engn Training Ctr, Shenyang 110819, Peoples R China
4.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Tian Ni,Shi Xu,Liu Wei,et al. Effect of Pre-Tension on the Fatigue Fracture of Under-Aged 7N01 Aluminum Alloy Plate[J]. ACTA METALLURGICA SINICA,2022,58(6):760-770.
APA Tian Ni,Shi Xu,Liu Wei,Liu Chuncheng,Zhao Gang,&Zuo Liang.(2022).Effect of Pre-Tension on the Fatigue Fracture of Under-Aged 7N01 Aluminum Alloy Plate.ACTA METALLURGICA SINICA,58(6),760-770.
MLA Tian Ni,et al."Effect of Pre-Tension on the Fatigue Fracture of Under-Aged 7N01 Aluminum Alloy Plate".ACTA METALLURGICA SINICA 58.6(2022):760-770.
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