Microstructure and Mechanical Properties of X80 Pipeline Steel Joints by Friction Stir Welding Under Various Cooling Conditions

doi:10.1007/s40195-019-00940-0

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	Microstructure and Mechanical Properties of X80 Pipeline Steel Joints by Friction Stir Welding Under Various Cooling Conditions
	Xie, G. M.1; Duan, R. H.1; Xue, P.2; Ma, Z. Y.2; Liu, H. L.1; Luo, Z. A.1
刊名	ACTA METALLURGICA SINICA-ENGLISH LETTERS
	2020
卷号	33 期号:1 页码:88-102
关键词	Friction stir welding Pipeline steel Microstructure Mechanical properties Cooling
ISSN号	1006-7191
DOI	10.1007/s40195-019-00940-0
通讯作者	Xie, G. M.(xiegm@ral.neu.edu.cn)
英文摘要	X80 pipeline steel plates were friction stir welded (FSW) under air, water, liquid CO2 + water, and liquid CO2 cooling conditions, producing defect-free welds. The microstructural evolution and mechanical properties of these FSW joints were studied. Coarse granular bainite was observed in the nugget zone (NZ) under air cooling, and lath bainite and lath martensite increased significantly as the cooling medium temperature reduced. In particular, under the liquid CO2 cooling condition, a dual phase structure of lath martensite and fine ferrite appeared in the NZ. Compared to the case under air cooling, a strong shear texture was identified in the NZs under other rapid cooling conditions, because the partial deformation at elevated temperature was retained through higher cooling rates. Under liquid CO2 cooling, the highest transverse tensile strength and elongation of the joint reached 92% and 82% of those of the basal metal (BM), respectively, due to the weak tempering softening. A maximum impact energy of up to 93% of that of the BM was obtained in the NZ under liquid CO2 cooling, which was attributed to the operation of the dual phase of lath martensite and fine ferrite.
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	CHINESE ACAD SCIENCES, INST METAL RESEARCH
WOS记录号	WOS:000512013800008
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/137340]
专题	金属研究所_中国科学院金属研究所
通讯作者	Xie, G. M.
作者单位	1.Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Xie, G. M.,Duan, R. H.,Xue, P.,et al. Microstructure and Mechanical Properties of X80 Pipeline Steel Joints by Friction Stir Welding Under Various Cooling Conditions[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2020,33(1):88-102.
APA	Xie, G. M.,Duan, R. H.,Xue, P.,Ma, Z. Y.,Liu, H. L.,&Luo, Z. A..(2020).Microstructure and Mechanical Properties of X80 Pipeline Steel Joints by Friction Stir Welding Under Various Cooling Conditions.ACTA METALLURGICA SINICA-ENGLISH LETTERS,33(1),88-102.
MLA	Xie, G. M.,et al."Microstructure and Mechanical Properties of X80 Pipeline Steel Joints by Friction Stir Welding Under Various Cooling Conditions".ACTA METALLURGICA SINICA-ENGLISH LETTERS 33.1(2020):88-102.