Microstructure evolution and impact toughness variation for high strength steel multi-pass weld metals with various cooling rates

doi:10.1016/j.jmapro.2021.03.027

	Microstructure evolution and impact toughness variation for high strength steel multi-pass weld metals with various cooling rates
	Li, Wei 1,2; Cao, Rui1,2 ; Zhu, Wanchao 1,2; Guo, Xili 3; Jiang, Yong 3; Chen, Jianhong1,2
	2021-05
发表期刊	JOURNAL OF MANUFACTURING PROCESSES
ISSN	1526-6125
卷号	65 页码:245-257
摘要	Thermally simulated experiments on high-strength weld metals were performed. Based on the results, an extended continuous cooling transformation (CCT) curve with microstructure, hardness, and impact toughness can be proposed. The microstructures, hardness, high-angle grain boundaries, impact toughness, and fracture surfaces of the weld metals treated with different cooling rates were systematically compared and analyzed. The microstructure of the original weld metal corresponds to a cooling rate of 5 ?C/s and is composed of uniform granular bainite and a small amount of acicular ferrite, which is similar to that of the specimens with cooling rates of 3-30 ?C/s. The increase in the cooling rates leads to the evolution of the microstructure from quasipolygon ferrite to granular bainite. The proportion of large angle grain boundaries increases with the increasing cooling rate, which can increase the resistance of crack propagation and induce a higher impact toughness. The impact toughness at room temperature is in the range of 80?131.81 J. Various cooling rates lead to various impact toughness. Except for the cooling rate of 5 ?C/s, the other cooling rates decrease the impact toughness. Moreover, at the lowest cooling rate, the decrease in the impact toughness reaches 63 %. The impact toughness at -50 ?C is in the range of 34?109.86 J. The impact toughness of the weld metals without thermally simulated processes at -50 ?C is 88.6 J. The reheating process decreases the impact toughness from 88.6 J to 34 J, and the decrease rate of the impact toughness at -50 ?C reaches 38 %.
关键词	High strength steel weld metals Cooling rate High-angle grain boundary Microstructure Impact toughness Extended continuous cooling transformation (CCT) curve
DOI	10.1016/j.jmapro.2021.03.027
收录类别	SCIE ; SCOPUS ; EI
语种	英语
WOS研究方向	Engineering
WOS类目	Engineering, Manufacturing
WOS记录号	WOS:000642215900001
出版者	ELSEVIER SCI LTD
EI入藏号	20211510189002
EI主题词	Microstructure
EI分类号	531.2 Metallography - 538.2 Welding - 545.3 Steel - 641.2 Heat Transfer - 921.6 Numerical Methods - 951 Materials Science
来源库	WOS
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	https://ir.lut.edu.cn/handle/2XXMBERH/148231
专题	材料科学与工程学院材料科学与工程学院_特聘教授组
通讯作者	Cao, Rui
作者单位	1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China; 2.Lanzhou Univ Technol, Dept Mat Sci & Engn, Lanzhou 730050, Gansu, Peoples R China; 3.Atlantic China Welding Consumables Inc, Zigong 643000, Peoples R China
第一作者单位	省部共建有色金属先进加工与再利用国家重点实验室; 兰州理工大学
通讯作者单位	省部共建有色金属先进加工与再利用国家重点实验室; 兰州理工大学
第一作者的第一单位	省部共建有色金属先进加工与再利用国家重点实验室
推荐引用方式 GB/T 7714	Li, Wei,Cao, Rui,Zhu, Wanchao,et al. Microstructure evolution and impact toughness variation for high strength steel multi-pass weld metals with various cooling rates[J]. JOURNAL OF MANUFACTURING PROCESSES,2021,65:245-257.
APA	Li, Wei,Cao, Rui,Zhu, Wanchao,Guo, Xili,Jiang, Yong,&Chen, Jianhong.(2021).Microstructure evolution and impact toughness variation for high strength steel multi-pass weld metals with various cooling rates.JOURNAL OF MANUFACTURING PROCESSES,65,245-257.
MLA	Li, Wei,et al."Microstructure evolution and impact toughness variation for high strength steel multi-pass weld metals with various cooling rates".JOURNAL OF MANUFACTURING PROCESSES 65(2021):245-257.