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Effects of pre-tempering on the microstructure, hardness and impact toughness of the 2.25Cr-lMo-0.25V heat-resistant steel weld metal | |
Li, Xinyu1; Jiang, Yong1; Wu, Kefan2,3; Dong, Wanlong2,3; Yang, Fei1; Jia, Xingwang1; Xu, Xiaolong1; Chen, Jianhong2,3; Cao, Rui2,3 | |
2021-10 | |
发表期刊 | INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING |
ISSN | 0308-0161 |
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 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. |
关键词 | 2.25Cr-lMo-0.25V heat-Resistant steel weld metal Pre-tempering PWHT Impact toughness Microstructure Fracture surface |
DOI | 10.1016/j.ijpvp.2021.104455 |
收录类别 | EI ; SCOPUS ; 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 SCI LTD |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | https://ir.lut.edu.cn/handle/2XXMBERH/148736 |
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 |
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 |
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). |
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