Sources of variability and improvement in impact toughness of a low Cr–Mo steel weld metal

doi:10.1016/j.ijpvp.2020.104175

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	Sources of variability and improvement in impact toughness of a low Cr–Mo steel weld metal
	Yan, Yingjie 1,2; Liu, Gang 1,2; Cao, Rui 1,2; Li, Xinyu 3; Jiang, Yong 3; Huang, Yifang 3; Dou, Guishan 1,2; Wu, Kefan 2; Chen, Jianhong 1,2
刊名	International Journal of Pressure Vessels and Piping
	2020-11-01
卷号	187
关键词	Bainite Cooling Creep resistance Fracture toughness Metals Microstructure Molybdenum steel Scanning electron microscopy Specific heat Tempering Welding Welds Fracture surfaces Granular bainites Heat treatment process Heat-resistance steels Post weld heat treatment Sources of variability Steel weld metal Welding residual stress
ISSN号	03080161
DOI	10.1016/j.ijpvp.2020.104175
英文摘要	For the heat resistance steel weld metal, special post-weld heat treatments need to be performed to maintain the creep resistance, improve the impact toughness, and relieve the welding residual stress. In this paper, firstly, the three factors affecting variability and lower values of toughness were revealed. Secondly, two different post-weld heat treatment (PWHT) methods have been used to improve the impact toughness of a heat resistance steel weld metal. Two PWHT methods include post-weld direct tempering (PWDT) process at 690 °C/26 h/air cooling and post-weld normalized tempering (PWNT) process with re-austenitization at 960 °C/1.5 h/air cooling + tempering at 690 °C/26 h/air cooling. For three type specimens with as-welded (AW), PWDT, PWNT processes, the impact toughness and the hardness were measured, and the fracture surface, microstructures were observed and analyzed by scanning electron microscope (SEM). Results indicated that PWDT heat treatment can improve the impact toughness of the weld metals from the original 79 J - 169 J to 82 J–290 J because the microstructure is changed from granular bainite to block ferrite and granular bainite. PWNT heat treatment can remarkably improve the impact toughness of the weld metals from the original 79 J- 169 J to 148 J–325 J. It is attributed to that PWNT heat treatment process can remove the boundaries of the columnar grain zone and reheated zone, make the difference of the microstructure between the columnar grain zone and reheated zone decrease, and improve the homogeneity of the microstructure. © 2020 Elsevier Ltd
语种	英语
出版者	Elsevier Ltd
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/115214]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院设计艺术学院
作者单位	1.School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou; Gansu; 730050, China; 2.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; Gansu; 730050, China; 3.Atlantic China Welding Consumables, Inc., Zigong; 643000, China
推荐引用方式 GB/T 7714	Yan, Yingjie,Liu, Gang,Cao, Rui,et al. Sources of variability and improvement in impact toughness of a low Cr–Mo steel weld metal[J]. International Journal of Pressure Vessels and Piping,2020,187.
APA	Yan, Yingjie.,Liu, Gang.,Cao, Rui.,Li, Xinyu.,Jiang, Yong.,...&Chen, Jianhong.(2020).Sources of variability and improvement in impact toughness of a low Cr–Mo steel weld metal.International Journal of Pressure Vessels and Piping,187.
MLA	Yan, Yingjie,et al."Sources of variability and improvement in impact toughness of a low Cr–Mo steel weld metal".International Journal of Pressure Vessels and Piping 187(2020).