Effect of Tempering Time on Carbide Evolution and Mechanical Properties in a Fe-Cr-Ni-Mo High-Strength Steel

doi:10.11900/0412.1961.2017.00231

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	Effect of Tempering Time on Carbide Evolution and Mechanical Properties in a Fe-Cr-Ni-Mo High-Strength Steel
	Du Yubin 1,2; Hu Xiaofeng 1; Jiang Haichang 1; Yan Desheng 1; Rong Lijian 1
刊名	ACTA METALLURGICA SINICA
	2018-01-11
卷号	54 期号:1 页码:11-20
关键词	Fe-Cr-Ni-Mo high-strength steel tempering time carbide strength low temperature impact toughness
ISSN号	0412-1961
DOI	10.11900/0412.1961.2017.00231
通讯作者	Hu Xiaofeng(xfhu@imr.ac.cn)
英文摘要	Fe-Cr-Ni-Mo steel is widely used in various industrial fields, such as water turbine in hydroelectric power station, pressure vessel and shipbuilding section etc. due to its excellent performance in strength and impact toughness. In order to fulfill the needs of high-strength and good toughness, the quenching and following tempering are often used for this kind of Fe-Cr-Ni-Mo steel. In particular, the carbide precipitation in the tempering process is the key to determine the strength and toughness. In this work, TEM and SEM were used to investigate the effect of tempering time (10, 20, 40 and 120 min) on carbide evolution and mechanical properties of Fe-Cr-Ni-Mo steel with different V contents (0, 0.08% and 0.14%, mass fraction) after quenched at 860 degrees C and following tempering at 610 degrees C. The results show that some M7C3 type carbides precipitated along martensite lath boundaries in quenched 0V steel, but no carbide in the quenched 008V and 014V steels. As a result, the strength of 0V steel (2060 MPa) is higher than 008V and 014V (1906 and 1857 MPa, respectively). After tempering for 20 min, a small amount of M3C type carbides were found on the lath boundaries in 0V steel. With tempering time increasing, M3C will transform into M23C6 carbide gradually. Both M3C and M23C6 type carbides exhibited a large size in range from 150 nm to 300 nm which were unfavorable to strength. As a result, the tensile strength of 0V steel decreases from 1197 MPa to 1088 MPa when tempering time increases from 20 min to 120 min. As for the 008V and 014V steels tempered for 20min, there are not only M3C type carbides precipitated in the grain boundary, but also M2C type carbides found inside the grains. The size of both carbides is no larger than 80 nm. With increasing tempering time, the M3C will dissolve gradually and there will precipitate much more M6C and MC. Compared with coarse M3C, the finer M2C, M6C and MC have better precipitation strengthening effect and less deterioration of ductility and toughness. Therefore, with increasing tempering time the strengthes of 008V and 014V steels keep stable and the elongation and impact toughnesses increase gradually. This indicates that the excellent combination of strength and impact toughness can be obtained in 008V and 014V steels.
资助项目	National Key Research and Development Program of China[2016YFB0300601] ; National Key Research and Development Program of China[2016YFB1200501]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000418584100002
资助机构	National Key Research and Development Program of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/127120]
专题	金属研究所_中国科学院金属研究所
通讯作者	Hu Xiaofeng
作者单位	1.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Du Yubin,Hu Xiaofeng,Jiang Haichang,et al. Effect of Tempering Time on Carbide Evolution and Mechanical Properties in a Fe-Cr-Ni-Mo High-Strength Steel[J]. ACTA METALLURGICA SINICA,2018,54(1):11-20.
APA	Du Yubin,Hu Xiaofeng,Jiang Haichang,Yan Desheng,&Rong Lijian.(2018).Effect of Tempering Time on Carbide Evolution and Mechanical Properties in a Fe-Cr-Ni-Mo High-Strength Steel.ACTA METALLURGICA SINICA,54(1),11-20.
MLA	Du Yubin,et al."Effect of Tempering Time on Carbide Evolution and Mechanical Properties in a Fe-Cr-Ni-Mo High-Strength Steel".ACTA METALLURGICA SINICA 54.1(2018):11-20.