EFFECTS OF TEMPERING TEMPERATURE ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF GRANULAR BAINITE IN 2.25Cr-1Mo-0.25V STEEL

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	EFFECTS OF TEMPERING TEMPERATURE ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF GRANULAR BAINITE IN 2.25Cr-1Mo-0.25V STEEL
	Jiang Zhonghua; Wang Pei; Li Dianzhong; Li Yiyi
刊名	ACTA METALLURGICA SINICA
	2015-08-11
卷号	51 期号:8 页码:925-934
关键词	2.25Cr-1Mo-0.25V steel granular bainite impact toughness M-A island
ISSN号	0412-1961
通讯作者	Wang Pei(pwang@imr.ac.cn)
英文摘要	2.25Cr-1Mo-0.25V steel is the most popular material used for pressure-vessel applied at elevated-temperature in hydrogen environment. For higher process efficiencies in future coal-conversion plants, chemical processing plants, and petrochemical-refining plants, much thicker cross-section component are necessary for constructing much larger pressure-vessel for these plants. Because of the thick cross-section, the cooling rate in the central region of the component is insufficient to obtain low bainite during quenching treatment, and a large amount of granular bainite appears in the central region. Previous studies have shown that good impact toughness can be achieved by appropriate tempering for 2.25Cr-1Mo-0.25V steel with low bainite microstructure. However, the impact toughness of 2.25Cr-1Mo-0.25V steel with granular bainite after tempering always cannot satisfy the demanding requirement due to the unclear understanding of the evolution of microstructure and mechanical properties during tempering. In this work, the influence of tempering on the microstructure and mechanical properties of 2.25Cr-1Mo-0.25V steel with granular bainite microstructure was investigated by OM, XRD, SEM, TEM and EP-MA. The results show that the normalized 2.25Cr-1Mo-0.25V steel with granular bainite microstructure is composed of bainite ferrite and island of martensite and austenite (M-A island). Nanoindentation test indicates that MA island is much harder than that of metrix bainite ferrite, because of the high concentration of carbon in M-A is-lands. The synergistic effect of the decomposition of M-A islands and softening of bainite ferrite determined that Charpy absorbed energy at 18 degrees C increases first and then decreases with the increasement of tempering temperature. The degree of decomposition of M-A islands and the morphology, size and distribution of carbides in granular bainite, coupled with the softening effect of bainite ferrite recrystallization are the key factors determining low-temperature impact toughness of 2.25Cr-1Mo-0.25V steel.
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000359683900005
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/120573]
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	Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Jiang Zhonghua,Wang Pei,Li Dianzhong,et al. EFFECTS OF TEMPERING TEMPERATURE ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF GRANULAR BAINITE IN 2.25Cr-1Mo-0.25V STEEL[J]. ACTA METALLURGICA SINICA,2015,51(8):925-934.
APA	Jiang Zhonghua,Wang Pei,Li Dianzhong,&Li Yiyi.(2015).EFFECTS OF TEMPERING TEMPERATURE ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF GRANULAR BAINITE IN 2.25Cr-1Mo-0.25V STEEL.ACTA METALLURGICA SINICA,51(8),925-934.
MLA	Jiang Zhonghua,et al."EFFECTS OF TEMPERING TEMPERATURE ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF GRANULAR BAINITE IN 2.25Cr-1Mo-0.25V STEEL".ACTA METALLURGICA SINICA 51.8(2015):925-934.