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Effect of Indirect Transformation of Retained Austenite During Tempering on the Charpy Impact Toughness of a Low-Alloy Cr-Mo-V Steel
Li, Yong-Han; Jiang, Zhong-Hua; Yang, Zhen-Dan; Zhu, Jue-Shun
Corresponding AuthorJiang, Zhong-Hua(zhjiang12s@imr.ac.cn)
2020-04-29
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Volume33Issue:10Pages:13
AbstractA modified tempering treatment has been designed in order to avoid the direct transformation of retained austenite (Ar) during tempering of a low-alloy Cr-Mo-V steel. Instead of the direct transformation of Ar into ferrite and M23C6 carbides during conventional tempering at 700 degrees C, transformation into aggregate of ferrite and cementite has been forced by a pre-tempering at 455 degrees C before conventional tempering. Experiments have been performed on specimens quenched with cooling rates 1.5, 3 and 12 degrees C/s, providing different types of Ar within the as-quenched microstructures. The results show that the tempering modification does not improve the Charpy impact toughness at the highest quenching rate of 12 degrees C/s, where the specimens cannot incur cleavage cracking induced from fine and discontinuous M23C6 carbides along lath interfaces. For the lowest quenching rate 1.5 degrees C/s, the Charpy impact toughness can be improved, and the failure is dominated by carbide aggregates, which originate from the decomposed products of blocky Ar. This is because the tempering modification effectively suppresses the formation of coarse M23C6 carbides at interfaces between the carbide aggregate and bainitic matrix, thereby resulting in a relatively homogeneous distribution of M23C6 carbides inside carbide aggregates. Therefore, the tempering modification is recommended for large-scale forgings, in which relatively high quenching rates are difficult to achieve.
KeywordBainite steel Retained austenite Impact toughness
Funding OrganizationShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
DOI10.1007/s40195-020-01055-7
Indexed BySCI
Language英语
Funding ProjectShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences[L2019F48]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000529568300001
PublisherCHINESE ACAD SCIENCES, INST METAL RESEARCH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/138680
Collection中国科学院金属研究所
Corresponding AuthorJiang, Zhong-Hua
AffiliationChinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Li, Yong-Han,Jiang, Zhong-Hua,Yang, Zhen-Dan,et al. Effect of Indirect Transformation of Retained Austenite During Tempering on the Charpy Impact Toughness of a Low-Alloy Cr-Mo-V Steel[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2020,33(10):13.
APA Li, Yong-Han,Jiang, Zhong-Hua,Yang, Zhen-Dan,&Zhu, Jue-Shun.(2020).Effect of Indirect Transformation of Retained Austenite During Tempering on the Charpy Impact Toughness of a Low-Alloy Cr-Mo-V Steel.ACTA METALLURGICA SINICA-ENGLISH LETTERS,33(10),13.
MLA Li, Yong-Han,et al."Effect of Indirect Transformation of Retained Austenite During Tempering on the Charpy Impact Toughness of a Low-Alloy Cr-Mo-V Steel".ACTA METALLURGICA SINICA-ENGLISH LETTERS 33.10(2020):13.
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