Investigation on the microstructure and mechanical properties of autogenous laser welding joint of ITER BTCC case lid

doi:10.1016/j.fusengdes.2020.111607

	Investigation on the microstructure and mechanical properties of autogenous laser welding joint of ITER BTCC case lid
	Dai Wen-Hua 1,2; Song Yun-Tao 1,2; Xin Ji-Jun 1,2; Chao, Fang 2; Jing, Wei 2; Wu Jie-Feng 2
刊名	FUSION ENGINEERING AND DESIGN
	2020-07-01
卷号	156
关键词	316LN Laser welding Microstructure Mechanical properties
ISSN号	0920-3796
DOI	10.1016/j.fusengdes.2020.111607
通讯作者	Jing, Wei(jingw@ipp.ac.cn)
英文摘要	The 316LN stainless steel with a thickness of 21 mm was welded by autogenous laser welding from both sides with an YLS-20000 fiber laser welding system. The microstructure of the welding joint was characterized by optical microscope. The tensile and bending tests were performed at room temperature and impact testing was conducted at 4.2 K. The results show that the thickness of the remelting region decreases with the increase of welding speed. The microstructure of the weld zone was single austenite phase. The tensile strength of the welded joint is 623 MPa at room temperature, equal to that of the base material (624 MPa). The fracture was located in the base metal. The bending test of the welding joint shows that no micro crack could be found on the surface of the samples after bending to 180 degrees, which indicates that the welded joint has good bending strength and plasticity. The average impact absorption energy of the welding area and heat affected zone at 4.2 K is 173 +/- 10 J and 241 +/- 8 J, respectively. The fracture surface shows a typical ductile fracture mode featured with fine equiaxed dimples and tearing ridges. All the test results meet the ITER design requirement.
资助项目	National Natural Science Foundation of China[51525703] ; ITER IO magnet division
WOS关键词	TOUGHNESS BEHAVIOR ; METAL ; STEEL ; STRENGTH
WOS研究方向	Nuclear Science & Technology
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000547855400010
资助机构	National Natural Science Foundation of China ; ITER IO magnet division
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/71141]
专题	中国科学院合肥物质科学研究院
通讯作者	Jing, Wei
作者单位	1.Univ Sci & Technol China, Hefei 230026, Peoples R China 2.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Dai Wen-Hua,Song Yun-Tao,Xin Ji-Jun,et al. Investigation on the microstructure and mechanical properties of autogenous laser welding joint of ITER BTCC case lid[J]. FUSION ENGINEERING AND DESIGN,2020,156.
APA	Dai Wen-Hua,Song Yun-Tao,Xin Ji-Jun,Chao, Fang,Jing, Wei,&Wu Jie-Feng.(2020).Investigation on the microstructure and mechanical properties of autogenous laser welding joint of ITER BTCC case lid.FUSION ENGINEERING AND DESIGN,156.
MLA	Dai Wen-Hua,et al."Investigation on the microstructure and mechanical properties of autogenous laser welding joint of ITER BTCC case lid".FUSION ENGINEERING AND DESIGN 156(2020).