A comparative study of conventional, dynamic rotation and heat-assisted friction stir welding of Ti-6Al-4V plates to reduce welding defects

doi:10.1016/j.jmatprotec.2023.118217

IMR OpenIR

	A comparative study of conventional, dynamic rotation and heat-assisted friction stir welding of Ti-6Al-4V plates to reduce welding defects
	Cong, S.1,2; Li, N.1,2; Zhu, Z.4; Wu, L. H.1,2,3; Xue, P.1,2,3; Wang, Z. W.2; Ni, D. R.1,2; Xiao, B. L.1,2; Ma, Z. Y.1,2
通讯作者	Wu, L. H.(lhwu@imr.ac.cn) ; Ni, D. R.(drni@imr.ac.cn)
	2024-02-01
发表期刊	JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
ISSN	0924-0136
卷号	323 页码:13
摘要	It is very easy to form bottom defects during friction stir welding (FSW) of medium-thick/thick Ti alloys, while there is a lack of in-depth research on its essential cause. In this study, conventional FSW (CFSW), dynamic rotation FSW (DRFSW) and back heating assisted FSW (BHAFSW) were conducted to 6 mm Ti-6Al-4 V plates. The combination of experimental examination and finite element modelling was utilized to deeply study the bottom defect formation mechanism. The results showed that bottom defects always existed in both CFSW and DRFSW joints, which was mainly attributed to the phase transformation difference at the joint bottom, as the result of the difference of the bottom temperature and the phase transformation point. A proper bottom temperature compensation of 150 degrees C via BHAFSW was designed to avoid the phase transition difference and improve the material flow, which effectively eliminated the bottom defects. This is the first time to uncover the reason of the bottom defect generation during FSW, and thus defect-free Ti alloy medium-thick plate joints were achieved via BHAFSW. The BHAFSW joint achieved the 1022 MPa in strength and 16% in ductility, with the equal strength to the base material (BM) but with very few losses of the ductility. The joint exhibited an impact toughness of 10.4 J, 48.1% higher than the BM. This study uncovers the reason for the typical bottom defect and provides a new way to improve the quality of medium-thick/thick Ti alloy FSW joints.
关键词	Ti alloys Friction stir welding Assisting welding methods Microstructure Mechanical property
资助者	National Natural Science Foundation of China ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Liaoning Province Excellent Youth Foundation
DOI	10.1016/j.jmatprotec.2023.118217
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51975553] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2021193] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[Y2021061] ; Liaoning Province Excellent Youth Foundation[2021- YQ-01]
WOS研究方向	Engineering ; Materials Science
WOS类目	Engineering, Industrial ; Engineering, Manufacturing ; Materials Science, Multidisciplinary
WOS记录号	WOS:001125053800001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：11[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/182893
专题	中国科学院金属研究所
通讯作者	Wu, L. H.; Ni, D. R.
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shi changxu Innovat Ctr Adv Mat, 72 Wenhua Rd, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, 72 Wenhua Rd, Shenyang 110016, Peoples R China 4.Shenyang Aerosp Univ, Coll Mat Sci & Engn, 37 Daoyi South Ave, Shenyang 110136, Peoples R China
推荐引用方式 GB/T 7714	Cong, S.,Li, N.,Zhu, Z.,et al. A comparative study of conventional, dynamic rotation and heat-assisted friction stir welding of Ti-6Al-4V plates to reduce welding defects[J]. JOURNAL OF MATERIALS PROCESSING TECHNOLOGY,2024,323:13.
APA	Cong, S..,Li, N..,Zhu, Z..,Wu, L. H..,Xue, P..,...&Ma, Z. Y..(2024).A comparative study of conventional, dynamic rotation and heat-assisted friction stir welding of Ti-6Al-4V plates to reduce welding defects.JOURNAL OF MATERIALS PROCESSING TECHNOLOGY,323,13.
MLA	Cong, S.,et al."A comparative study of conventional, dynamic rotation and heat-assisted friction stir welding of Ti-6Al-4V plates to reduce welding defects".JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 323(2024):13.