Effect of Indirect Transformation of Retained Austenite During Tempering on the Charpy Impact Toughness of a Low-Alloy Cr-Mo-V Steel

doi:10.1007/s40195-020-01055-7

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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
刊名	ACTA METALLURGICA SINICA-ENGLISH LETTERS
	2020-04-29
页码	13
关键词	Bainite steel Retained austenite Impact toughness
ISSN号	1006-7191
DOI	10.1007/s40195-020-01055-7
通讯作者	Jiang, Zhong-Hua(zhjiang12s@imr.ac.cn)
英文摘要	A 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.
资助项目	Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences[L2019F48]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	CHINESE ACAD SCIENCES, INST METAL RESEARCH
WOS记录号	WOS:000529568300001
资助机构	Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/138682]
专题	金属研究所_中国科学院金属研究所
通讯作者	Jiang, Zhong-Hua
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China
推荐引用方式 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,2020:13.
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,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 (2020):13.