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Achieving superior low temperature and high strain rate superplasticity in submerged friction stir welded Ti-6Al-4V alloy
Wu, LH; Zhang, H; Zeng, XH; Xue, P; Xiao, B; Ma, ZY; Ma, ZY (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
2018-03-01
Source PublicationSCIENCE CHINA-MATERIALS
ISSN2095-8226
Volume61Issue:3Pages:417-423
AbstractThe superplastic forming of Ti alloy welds has great application prospects in producing integrated components. However, the nugget zone (NZ) of the Ti alloy welds, produced by fusion welding or conventional friction stir welding (FSW), consists of lamellar microstructure, which exhibits either low superplasticity or high superplastic temperautre and low strain rate. As a result, the NZ plays a leading role in hindering the superplastic forming of the whole welds. In this study, submerged friction stir welding (SFSW) was conducted in Ti-6Al-4V alloy for the first time, and a defectfree weld with the NZ consisting of a strip microstructure was obtained. The NZ exhibited a low-temperature superplasticity at 600 degrees C, which was the lowest superplastic temperature ever reported in the Ti alloy welds. Besides, at 800 degrees C, the NZ showed high strain rate (3x10(-2) s(-1)) superplasticity and a largest elongation of 615% at 1x10(-3) s(-1). Compared to conventional FSW joints, the NZ of SFSW joint exhibited a much lower flow stress and a decrease in optimal superplastic temperature by 100 degrees C. This is mainly attributed to the easy globularization of the strip microstructure, enhancing the ability of grain/phase boundary sliding.; The superplastic forming of Ti alloy welds has great application prospects in producing integrated components. However, the nugget zone (NZ) of the Ti alloy welds, produced by fusion welding or conventional friction stir welding (FSW), consists of lamellar microstructure, which exhibits either low superplasticity or high superplastic temperautre and low strain rate. As a result, the NZ plays a leading role in hindering the superplastic forming of the whole welds. In this study, submerged friction stir welding (SFSW) was conducted in Ti-6Al-4V alloy for the first time, and a defectfree weld with the NZ consisting of a strip microstructure was obtained. The NZ exhibited a low-temperature superplasticity at 600 degrees C, which was the lowest superplastic temperature ever reported in the Ti alloy welds. Besides, at 800 degrees C, the NZ showed high strain rate (3x10(-2) s(-1)) superplasticity and a largest elongation of 615% at 1x10(-3) s(-1). Compared to conventional FSW joints, the NZ of SFSW joint exhibited a much lower flow stress and a decrease in optimal superplastic temperature by 100 degrees C. This is mainly attributed to the easy globularization of the strip microstructure, enhancing the ability of grain/phase boundary sliding.
description.department[wu, lihui ; zhang, hao ; zeng, xianghao ; xue, peng ; xiao, bolv ; ma, zongyi] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, liaoning, peoples r china
KeywordLamellar Microstructure Titanium Joint Deformation Evolution Behavior Surface Nugget Zone
Subject AreaMaterials Science, Multidisciplinary
Funding OrganizationNational Natural Science Foundation of China [51471171, 51601194, 51331008]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79452
Collection中国科学院金属研究所
Corresponding AuthorMa, ZY (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Wu, LH,Zhang, H,Zeng, XH,et al. Achieving superior low temperature and high strain rate superplasticity in submerged friction stir welded Ti-6Al-4V alloy[J]. SCIENCE CHINA-MATERIALS,2018,61(3):417-423.
APA Wu, LH.,Zhang, H.,Zeng, XH.,Xue, P.,Xiao, B.,...&Ma, ZY .(2018).Achieving superior low temperature and high strain rate superplasticity in submerged friction stir welded Ti-6Al-4V alloy.SCIENCE CHINA-MATERIALS,61(3),417-423.
MLA Wu, LH,et al."Achieving superior low temperature and high strain rate superplasticity in submerged friction stir welded Ti-6Al-4V alloy".SCIENCE CHINA-MATERIALS 61.3(2018):417-423.
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