High-cycle fatigue and fracture behavior of double-side friction stir welded 6082Al ultra-thick plates

doi:10.1016/j.engfracmech.2020.106887

IMR OpenIR

	High-cycle fatigue and fracture behavior of double-side friction stir welded 6082Al ultra-thick plates
	Yang, C.1,2; Wang, B. B.1; Yu, B. H.1; Wu, L. H.1; Xue, P.1; Zhang, X. M.3; He, G. Z.3; Ni, D. R.1; Xiao, B. L.1; Wang, K. S.4; Ma, Z. Y.1
通讯作者	Xue, P.(pxue@imr.ac.cn) ; Ni, D. R.(drni@imr.ac.cn)
	2020-03-01
发表期刊	ENGINEERING FRACTURE MECHANICS
ISSN	0013-7944
卷号	226 页码:11
摘要	For welded structures of precipitation-strengthened aluminum alloys, achieving sound joint with good fatigue property is not an easy task, especially for thick plates. In the present work, ultra-thick 6082Al-T4 alloy plates with 80 mm in thickness were double-side friction stir welded and heat-treated. The high cycle fatigue (HCF) property and fracture behavior of the joint were investigated using trisection specimens in thickness, and the key factors that affect the fracture behavior were addressed. High quality joint was achieved with the three-layered specimens fractured along the lowest hardness zone (LHZ) in the static tensile testing. Further, the fatigue life curves exhibited almost the same distribution tendency, and the same fatigue limit (110 MPa) and fatigue ratio (0.49) were achieved in the three-layered specimens. During fatigue testing, the middle and lower layers fractured along the LHZ, which was similar to those during the static tensile tests, while abnormal fracture occurred in the nugget zone (NZ) of the upper specimen. Further examination revealed that the residual stress in the NZ of the upper layer was tensile stress (+9 MPa) whereas it was compressive stress in the lower layer (-31 MPa). The tensile residual stress together with the external loaded cyclic tensile stress resulted in more serious fatigue damage in the upper layer and led to the abnormal fracture in the NZ.
关键词	Ultra-thick aluminum alloy plate Double-side friction stir welding High-cycle fatigue Microstructure, mechanical properties Residual stress
资助者	Youth Innovation Promotion Association of the Chinese Academy of Sciences ; National Natural Science Foundation of China
DOI	10.1016/j.engfracmech.2020.106887
收录类别	SCI
语种	英语
资助项目	Youth Innovation Promotion Association of the Chinese Academy of Sciences[2017236] ; National Natural Science Foundation of China[U1760201]
WOS研究方向	Mechanics
WOS类目	Mechanics
WOS记录号	WOS:000509727900016
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：7[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/321006/137289
专题	中国科学院金属研究所
通讯作者	Xue, P.; Ni, D. R.
作者单位	1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China 3.CRRC Changchun Railway Vehicles Co Ltd, Changchun 130062, Peoples R China 4.Xian Univ Architecture & Technol, Sch Met Engn, Xian 710055, Peoples R China
推荐引用方式 GB/T 7714	Yang, C.,Wang, B. B.,Yu, B. H.,et al. High-cycle fatigue and fracture behavior of double-side friction stir welded 6082Al ultra-thick plates[J]. ENGINEERING FRACTURE MECHANICS,2020,226:11.
APA	Yang, C..,Wang, B. B..,Yu, B. H..,Wu, L. H..,Xue, P..,...&Ma, Z. Y..(2020).High-cycle fatigue and fracture behavior of double-side friction stir welded 6082Al ultra-thick plates.ENGINEERING FRACTURE MECHANICS,226,11.
MLA	Yang, C.,et al."High-cycle fatigue and fracture behavior of double-side friction stir welded 6082Al ultra-thick plates".ENGINEERING FRACTURE MECHANICS 226(2020):11.