Influence of the decomposition behavior of retained austenite during tempering on the mechanical properties of 2.25Cr-1Mo-0.25 V steel

doi:10.1016/j.msea.2018.11.014

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	Influence of the decomposition behavior of retained austenite during tempering on the mechanical properties of 2.25Cr-1Mo-0.25 V steel
	Jiang, Zhonghua 1,2; Wang, Pei 1,2; Li, Dianzhong 1,2; Li, Yiyi 1,2
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2019-01-10
卷号	742 页码:540-552
关键词	Granular bainite steel Retained austenite Pre-tempering Carbide cluster Mechanical properties
ISSN号	0921-5093
DOI	10.1016/j.msea.2018.11.014
通讯作者	Wang, Pei(pwang@imr.ac.cn)
英文摘要	The as-quenched microstructure of 2.25Cr-1Mo-0.25 V steel heavy forgings is granular bainite, which is composed of bainitic ferrite and blocky islands of martensite and retained austenite (RA). In this study, the characteristics of RA decomposition and its effects on the mechanical properties of the steel are investigated. The results show that RA decomposes into a cluster of coarse M23C6 carbides and ferrite during standard tempering at 700 degrees C. These coarse carbides decorate the boundary of the cluster, thus deteriorating the impact toughness of the steel. Accordingly, the size and distribution of these carbides are tentatively modified by introducing pre-tempering at different temperatures ranging from 180 degrees to 650 degrees C before the standard tempering at 700 degrees C. This is because during pre-tempering, RA first decomposes into various transitional microstructures such as martensite, bainite or pearlite, which further transform into M23C6 carbide clusters during the subsequent 700 degrees C tempering. The experimental results show that 455 degrees C is the optimal pre-tempering temperature to improve the impact toughness of the steel after the 700 degrees C tempering. Microstructural observations reveal that during the 455 degrees C pretempering step, the RA completely decomposes into bainite consisting of fine bainitic packets and a high density of M3C carbides, which provide additional nucleation sites for M23C6 carbides inside the carbide clusters during the subsequent 700 degrees C tempering, and thus avoid the formation of coarse M23C6 distributed along carbide cluster boundaries.
资助项目	Youth Innovation Promotion Association, Chinese Academy of Sciences[2013126] ; Innovation Foundation of Graduate School of Institute of Metals Research, Chinese Academy of Sciences, China
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000457814400056
资助机构	Youth Innovation Promotion Association, Chinese Academy of Sciences ; Innovation Foundation of Graduate School of Institute of Metals Research, Chinese Academy of Sciences, China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/131529]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, Pei
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Zhonghua,Wang, Pei,Li, Dianzhong,et al. Influence of the decomposition behavior of retained austenite during tempering on the mechanical properties of 2.25Cr-1Mo-0.25 V steel[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2019,742:540-552.
APA	Jiang, Zhonghua,Wang, Pei,Li, Dianzhong,&Li, Yiyi.(2019).Influence of the decomposition behavior of retained austenite during tempering on the mechanical properties of 2.25Cr-1Mo-0.25 V steel.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,742,540-552.
MLA	Jiang, Zhonghua,et al."Influence of the decomposition behavior of retained austenite during tempering on the mechanical properties of 2.25Cr-1Mo-0.25 V steel".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 742(2019):540-552.