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Effects of rare earth on microstructure and impact toughness of low alloy Cr-Mo-V steels for hydrogenation reactor vessels
Jiang, Zhonghua1,2; Wang, Pei1,2; Li, Dianzhong1,2; Li, Yiyi1,2
Corresponding AuthorWang, Pei(pwang@imr.ac.cn)
2020-05-15
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume45Pages:1-14
AbstractThe effects of rare earth (RE) on the microstructure and impact toughness of low alloy Cr-Mo-V bainitic steels have been investigated where the steels have RE content of 0 to 0.048 wt.%. The results indicate that the normalized microstructures of the steels are typical granular bainite (GB) composed primarily of bainitic ferrite and martensite and/or austenite (M-A) constituents. The M-A constituents are transformed into ferrite and carbides and/or agglomerated carbides after tempering at 700 degrees C for 4 h. The addition of RE decreases the onset temperature of bainitic transformation and results in the formation of finer bainitic ferrite, and reduces the amount of carbon-rich M-A constituents. For the normalized and tempered samples, the ductile-to-brittle transition temperature (DBTT) decreases with increasing RE content to a critical value of 0.012 wt.%. Lower DBTT and higher upper shelf energy are attributed to the decreased effective grain size and lower amount of coarse agglomerated carbides from the decomposition of massive M-A constituents. However, the addition of RE in excess of 0.012 wt.% leads to a substantial increase in the volume fraction of large-sized inclusions, which are extremely detrimental to the impact toughness. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KeywordLow alloy Cr-Mo-V steel Rare earth Microstructure Impact toughness Granular bainite Martensite-austenite constituents
Funding OrganizationNational Natural Science Foundation of China ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; Innovation Foundation of Graduate School of Institute of Metals Research, Chinese Academy of Sciences, China ; Liao Ning Revitalization Talents Program
DOI10.1016/j.jmst.2019.03.012
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[U1708252] ; Youth Innovation Promotion Association, Chinese Academy of Sciences[2013126] ; Innovation Foundation of Graduate School of Institute of Metals Research, Chinese Academy of Sciences, China ; Liao Ning Revitalization Talents Program[XLYC 1807022]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000526956200001
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/138586
Collection中国科学院金属研究所
Corresponding AuthorWang, Pei
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Jiang, Zhonghua,Wang, Pei,Li, Dianzhong,et al. Effects of rare earth on microstructure and impact toughness of low alloy Cr-Mo-V steels for hydrogenation reactor vessels[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2020,45:1-14.
APA Jiang, Zhonghua,Wang, Pei,Li, Dianzhong,&Li, Yiyi.(2020).Effects of rare earth on microstructure and impact toughness of low alloy Cr-Mo-V steels for hydrogenation reactor vessels.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,45,1-14.
MLA Jiang, Zhonghua,et al."Effects of rare earth on microstructure and impact toughness of low alloy Cr-Mo-V steels for hydrogenation reactor vessels".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 45(2020):1-14.
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