Correlation between microstructure evolution and cryogenic fracture toughness in aging ITER-grade 316LN weldments

doi:10.1016/j.cryogenics.2018.04.003

	Correlation between microstructure evolution and cryogenic fracture toughness in aging ITER-grade 316LN weldments
	Xin, Jijun 1,2; Fang, Chao1 ; Huang, Chuanjun 3; Song, Yuntao 1; Wei, Jing1 ; Li, Laifeng 3
	2018-12-01
发表期刊	CRYOGENICS
ISSN	0011-2275
通讯作者	Fang, Chao(fangchao@ipp.ac.cn)
摘要	In the present work, the correlation between microstructural evolution and fracture toughness in 316LN joints welded by Tungsten Inert Gas (TIG) was investigated. The effect of post-weld heat treatment (PWHT) on the microstructure and toughness was characterized. The welding process can significantly change the equiaxed grains of base metal to cells and dendrites, while the PWHT can increase the dendrite size, mitigate the texutre intensity, reduce the dislocation density, and slightly weaken the ultimate tensile strength of the joints. Fracture toughness tests reveal that the strain-induced martensitic transformation at cryogenic temperatures can remarkably deteriorate the fracture toughness. Due to the microstructural evolution during PWHT, the J-integral values at 77 K and 4.2 K decrese to 85% and 54% of those in the as-welded conditions, respectively. The fracture morphology of the as-welded joint shows a characterization of ductile fracture, while the PWHT joint features a mixture of ductile and brittle fracture.
关键词	316LN weldment Post-weld heat treatment Microstructure Mechanical properties Fracture toughness
DOI	10.1016/j.cryogenics.2018.04.003
关键词[WOS]	CR/NI EQUIVALENT RATIO ; CHI PHASES ; STEEL ; SIGMA ; BEHAVIOR
收录类别	SCI
语种	英语
资助项目	ITER IO ; CNDA ; ITER IO ; CNDA
项目资助者	ITER IO ; ITER IO ; ITER IO ; ITER IO ; ITER IO ; ITER IO ; ITER IO ; ITER IO ; CNDA ; CNDA ; CNDA ; CNDA ; CNDA ; CNDA ; CNDA ; CNDA ; ITER IO ; ITER IO ; ITER IO ; ITER IO ; ITER IO ; ITER IO ; ITER IO ; ITER IO ; CNDA ; CNDA ; CNDA ; CNDA ; CNDA ; CNDA ; CNDA ; CNDA
WOS研究方向	Thermodynamics ; Physics
WOS类目	Thermodynamics ; Physics, Applied
WOS记录号	WOS:000452815400017
出版者	ELSEVIER SCI LTD
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.hfcas.ac.cn:8080/handle/334002/40881
专题	中科院等离子体物理研究所
通讯作者	Fang, Chao
作者单位	1.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China 2.Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China 3.Chinese Acad Sci, Tech Inst Phys & Chem, State Key Lab Technol Space Cryogen Propellants, Beijing 100190, Peoples R China
第一作者单位	中科院等离子体物理研究所
通讯作者单位	中科院等离子体物理研究所
推荐引用方式 GB/T 7714	Xin, Jijun,Fang, Chao,Huang, Chuanjun,et al. Correlation between microstructure evolution and cryogenic fracture toughness in aging ITER-grade 316LN weldments[J]. CRYOGENICS,2018,96:144-150.
APA	Xin, Jijun,Fang, Chao,Huang, Chuanjun,Song, Yuntao,Wei, Jing,&Li, Laifeng.(2018).Correlation between microstructure evolution and cryogenic fracture toughness in aging ITER-grade 316LN weldments.CRYOGENICS,96,144-150.
MLA	Xin, Jijun,et al."Correlation between microstructure evolution and cryogenic fracture toughness in aging ITER-grade 316LN weldments".CRYOGENICS 96(2018):144-150.