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

doi:10.1016/j.cryogenics.2018.04.003

CORC > 合肥物质科学研究院 > 中国科学院合肥物质科学研究院 > 中科院等离子体物理研究所

	Correlation between microstructure evolution and cryogenic fracture toughness in aging ITER-grade 316LN weldments
	Xin, Jijun 2,3; Fang, Chao 2; Huang, Chuanjun 1; Song, Yuntao 2; Wei, Jing 2; Li, Laifeng 1
刊名	CRYOGENICS
	2018-12-01
卷号	96 页码:144-150
关键词	316LN weldment Post-weld heat treatment Microstructure Mechanical properties Fracture toughness
ISSN号	0011-2275
DOI	10.1016/j.cryogenics.2018.04.003
通讯作者	Fang, Chao(fangchao@ipp.ac.cn)
英文摘要	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.
资助项目	ITER IO ; CNDA
WOS关键词	CR/NI EQUIVALENT RATIO ; CHI PHASES ; STEEL ; SIGMA ; BEHAVIOR
WOS研究方向	Thermodynamics ; Physics
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000452815400017
资助机构	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
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/40881]
专题	合肥物质科学研究院_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, Tech Inst Phys & Chem, State Key Lab Technol Space Cryogen Propellants, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China 3.Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
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.