Assessment of Mechanical Properties of Welding Joints for ITER Correction Coils Cases at Cryogenic Temperature

doi:10.1109/TASC.2021.3057330

	Assessment of Mechanical Properties of Welding Joints for ITER Correction Coils Cases at Cryogenic Temperature
	Huang, Chuanjun 1; Xin, Jijun 2; Wei, Jing 2; Zhang, Hengcheng 1; Huang, Rongjin 1; Xu, Dong 1; Liu, Sheng 3; Li, Laifeng 1
刊名	IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
	2021-09-01
卷号	31
关键词	Cryogenic ITER correction coil (CC) case mechanical property microstructures welding joints
ISSN号	1051-8223
DOI	10.1109/TASC.2021.3057330
通讯作者	Li, Laifeng(laifengli@mail.ipc.ac.cn)
英文摘要	To resist large electromagnetic loads, the ITER correction coils (CCs) are protected by a 20-mm thickness 316LN austenitic stainless steel case. Due to the strict tolerance requirement of the case manufacture, tungsten inert gas (TIG) welding technology was used for subcase assembly welding, whereas laser beam welding (LBW) technology was applied to enclosure welding of the cases. The case shall be operated at 4.2 K and shall undergo considerably cyclic stress due to magnet electromagnetization as well as interaction with the toroidal field (TF) and poloidal field (PF). This article focuses on the assessment of the mechanical properties of the welding joints at cryogenic temperature. Results indicated that the values of the ultimate tensile strength of the TIG welding joint and the LBW welding joint were 1555 and 1522 MPa, respectively, which reach to 99.7 and 97.6% of that of the base material (BM). The elongation at the fracture of both the TIG and LBW weldments was larger than 35%. The plane strain fracture toughness K-Ic(J) of the TIG and the LBW weldments was 210 and 241 MPa.m(1/2), respectively. The fractographic analysis indicated that the fracture surface was composed of fine equiaxed dimples, which indicated that both welding joints fractured in a ductile manner. The welding joints survived the minimum of 30 000 cycles fatigue test at stress level and load ratio specified by the ITER document. In addition, the fatigue crack growth rates of both welding joints were lower than that of the BM. All mechanical properties of both the welding joints satisfied the ITER specifications.
资助项目	National Key R&D Program of China[2017YFE0301405] ; National Key R&D Program of China[2017YFE0301504] ; National Natural Science Foundation of China[51877209]
WOS关键词	STAINLESS-STEEL
WOS研究方向	Engineering ; Physics
语种	英语
出版者	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
WOS记录号	WOS:000708645100001
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/125621]
专题	中国科学院合肥物质科学研究院
通讯作者	Li, Laifeng
作者单位	1.Chinese Acad Sci, Tech Inst Phys & Chem, Key Lab Cryogen, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 3.China Int Nucl Fus Energy Program Execut Ctr, Beijing 100862, Peoples R China
推荐引用方式 GB/T 7714	Huang, Chuanjun,Xin, Jijun,Wei, Jing,et al. Assessment of Mechanical Properties of Welding Joints for ITER Correction Coils Cases at Cryogenic Temperature[J]. IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY,2021,31.
APA	Huang, Chuanjun.,Xin, Jijun.,Wei, Jing.,Zhang, Hengcheng.,Huang, Rongjin.,...&Li, Laifeng.(2021).Assessment of Mechanical Properties of Welding Joints for ITER Correction Coils Cases at Cryogenic Temperature.IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY,31.
MLA	Huang, Chuanjun,et al."Assessment of Mechanical Properties of Welding Joints for ITER Correction Coils Cases at Cryogenic Temperature".IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 31(2021).