Effect of Defects on High Cycle Fatigue Property of Selective Laser Melted Ti6Al4V Alloy
Liu Lun1,2; Zhang Zhenjun2; Yang Huajie2; Ji Haibin2; Chen Jie3; Yi Junlan3; Wang Lei3; Li Xiaowu1; Zhang Zhefeng2
Corresponding AuthorLiu Lun(
AbstractIt is of significant importance to understand the influence of defects on the fatigue property of Ti6Al4V alloy prepared by selective laser melting for breaking through the limitation of this material in industrial applications. As the defects cannot be completely avoided, the microstructure and defect characterizations, high cycle fatigue performance and failure mechanism of the material were studied by OM, EBSD, X-ray tomography, fatigue testing machine, SEM, and laser confocal microscope. The results show that the microstructure of the alloy exhibits the unique process characteristics of additive manufacturing materials. Specifically, the density of the material is 99.99%, and the overall defect size is less than 60 mu m. The fatigue limit of the material is 398 MPa, fatigue cracks are formed in the lack of fusion defects of the fracture specimens and the cycles are less than 10(6). The effective stress intensity factors at the defects of the fractured samples are mostly distributed above the threshold value of short crack fatigue crack growth, which determines the low cycle life of the material. Finally, the K-T model was introduced to establish an evaluation method for the safe service of the material.
Keywordselective laser melting Ti6Al4V alloy microstructure defect high cycle fatigue property
Indexed BySCI
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000752491900032
Citation statistics
Document Type期刊论文
Corresponding AuthorLiu Lun
Affiliation1.Northeastern Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Anisotropy & Texture Mat, Shenyang 110819, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
3.COMAC Shanghai Aircraft Mfg Co Ltd, Shanghai 201324, Peoples R China
Recommended Citation
GB/T 7714
Liu Lun,Zhang Zhenjun,Yang Huajie,et al. Effect of Defects on High Cycle Fatigue Property of Selective Laser Melted Ti6Al4V Alloy[J]. RARE METAL MATERIALS AND ENGINEERING,2021,50(12):4429-4436.
APA Liu Lun.,Zhang Zhenjun.,Yang Huajie.,Ji Haibin.,Chen Jie.,...&Zhang Zhefeng.(2021).Effect of Defects on High Cycle Fatigue Property of Selective Laser Melted Ti6Al4V Alloy.RARE METAL MATERIALS AND ENGINEERING,50(12),4429-4436.
MLA Liu Lun,et al."Effect of Defects on High Cycle Fatigue Property of Selective Laser Melted Ti6Al4V Alloy".RARE METAL MATERIALS AND ENGINEERING 50.12(2021):4429-4436.
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