Effects of pre-tempering on the microstructure, hardness and impact toughness of the 2.25Cr–1Mo-0.25V heat-resistant steel weld metal

doi:10.1016/j.ijpvp.2021.104455

	Effects of pre-tempering on the microstructure, hardness and impact toughness of the 2.25Cr–1Mo-0.25V heat-resistant steel weld metal
	Li, Xinyu 1; Jiang, Yong 1; Wu, Kefan 2,3; Dong, Wanlong 2,3; Yang, Fei 1; Jia, Xingwang 1; Xu, Xiaolong 1; Chen, Jianhong2,3 ; Cao, Rui2,3
	2021-10
发表期刊	International Journal of Pressure Vessels and Piping
ISSN	03080161
卷号	193
摘要	In this study, the effects of pre-tempering on microstructure, hardness, impact toughness and fracture modes of weld metals in 2.25Cr–1Mo-0.25 V heat-resistant steel were investigated. Four weld metals with as-welded, three different post welding heat treatments were chosen as the investigated materials. Optical Microscopy (OM), Scanning Electron Microscope (SEM) were used to evaluate the microstructures of the weld metals. The mechanical properties of the weld metals were examined by hardness, and impact toughness experiments. The fracture surfaces of the weld metals were observed and analyzed by SEM. Results indicated that the impact toughness of as-welded metal is only 6 J, Post welding heat treatment (PWHT) of 705 °C + 8 h can increase the impact toughness of the weld metals to 16,18 and 119 J; 44, 80, 100, 169 and 177 J, respectively. The pre-tempering process with 650 °C with the heating rate of 55 °C/h and holding 40 h before 705 °C+8 h tempering process can increase the impact toughness to 126, 135, 136, 136, 167 J. The change of the impact toughness is directly related to the change of the microstructure. The microstructure of as-welded weld metal is mainly composed of granular bainite, which determined the lower impact toughness. The improvement of impact toughness for the weld metals after post welding heat treatment is attributed to the decomposed degree from Martensite-Austenite constituent into carbides. © 2021 Elsevier Ltd
关键词	Austenite Bainite Carbides Hardness Metals Microstructure Scanning electron microscopy Tempering Welding Welds Fracture mode Fracture surfaces Granular bainites Hardness and impact toughness Heat-resistant steel Martensite-austenite constituents Post-welding heat treatments Tempering process
DOI	10.1016/j.ijpvp.2021.104455
收录类别	EI ; SCIE
语种	英语
WOS研究方向	Engineering
WOS类目	Engineering, Multidisciplinary ; Engineering, Mechanical
WOS记录号	WOS:000691309800014
出版者	Elsevier Ltd
EI入藏号	20212510523383
EI主题词	Fracture toughness
EI分类号	531.2 Metallography ; 537.1 Heat Treatment Processes ; 538.2 Welding ; 804.2 Inorganic Compounds ; 951 Materials Science
来源库	WOS
引用统计	被引频次[WOS]：0 [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/150742
专题	材料科学与工程学院_特聘教授组材料科学与工程学院
通讯作者	Li, Xinyu; Cao, Rui
作者单位	1.Atlantic China Welding Consumables Inc, Zigong 643000, Sichuan, Peoples R China; 2.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China; 3.Lanzhou Univ Technol, Dept Mat Sci & Engn, Lanzhou 730050, Gansu, Peoples R China
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
推荐引用方式 GB/T 7714	Li, Xinyu,Jiang, Yong,Wu, Kefan,et al. Effects of pre-tempering on the microstructure, hardness and impact toughness of the 2.25Cr–1Mo-0.25V heat-resistant steel weld metal[J]. International Journal of Pressure Vessels and Piping,2021,193.
APA	Li, Xinyu.,Jiang, Yong.,Wu, Kefan.,Dong, Wanlong.,Yang, Fei.,...&Cao, Rui.(2021).Effects of pre-tempering on the microstructure, hardness and impact toughness of the 2.25Cr–1Mo-0.25V heat-resistant steel weld metal.International Journal of Pressure Vessels and Piping,193.
MLA	Li, Xinyu,et al."Effects of pre-tempering on the microstructure, hardness and impact toughness of the 2.25Cr–1Mo-0.25V heat-resistant steel weld metal".International Journal of Pressure Vessels and Piping 193(2021).