Effects of pre-tempering on the microstructure, hardness and impact toughness of the 2.25Cr-lMo-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-lMo-0.25V heat-resistant steel weld metal
	Li, Xinyu 2; Jiang, Yong 2; Wu, Kefan 1,3; Dong, Wanlong 1,3; Yang, Fei 2; Jia, Xingwang 2; Xu, Xiaolong 2; Chen, Jianhong 1,3; Cao, Rui 1,3
刊名	INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
	2021-10
卷号	193
关键词	2.25Cr-lMo-0.25V heat-Resistant steel weld metal Pre-tempering PWHT Impact toughness Microstructure Fracture surface
ISSN号	0308-0161
DOI	10.1016/j.ijpvp.2021.104455
英文摘要	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 degrees 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 pretempering process with 650 degrees C with the heating rate of 55 degrees C/h and holding 40 h before 705 degrees 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.
WOS研究方向	Engineering
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000691309800014
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148736]
专题	材料科学与工程学院
作者单位	1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China; 2.Atlantic China Welding Consumables Inc, Zigong 643000, Sichuan, Peoples R China; 3.Lanzhou Univ Technol, Dept Mat Sci & Engn, Lanzhou 730050, Gansu, Peoples R China
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-lMo-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-lMo-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-lMo-0.25V heat-resistant steel weld metal".INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING 193(2021).