Influence of Nb Content on Microstructure and Mechanical Properties of a 7%Ni Steel

doi:10.1007/s40195-018-0743-3

IMR OpenIR

	Influence of Nb Content on Microstructure and Mechanical Properties of a 7%Ni Steel
	Cao, Hong-Wei 1,2; Luo, Xing-Hong 2; Zhan, Guo-Feng 3; Liu, Shi 2
通讯作者	Luo, Xing-Hong(xhluo@imr.ac.cn)
	2018-09-01
发表期刊	ACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN	1006-7191
卷号	31 期号:9 页码:975-982
摘要	The influence of Nb content on the microstructure and cryogenic mechanical properties of a 7%Ni steel was investigated within the Nb content range from 0 to 0.05%. The microstructure was characterized by optical microscope, scanning electron microscope, transmission electron microscopy and X-ray diffraction, and the low-temperature mechanical property tests were conducted. The Nb addition can effectively refine the prior austenite grains and microstructure of the steel. Fine niobium precipitates with a diameter of about 10-50 nm were observed. They tend to be spherical and locate mainly in the vicinity of grain boundaries. Although there are considerable amounts of reversed austenite forming at grain boundaries in the specimen containing the highest Nb content, no Nb element was detected in such reversed austenite, which implies that Nb element did not affect the formation of the reversed austenite directly. Mechanical test results suggest that the strength of the 7%Ni steel is not simply in relation to the prior austenite grain size, but also depends on the amount of reversed austenite. On the other hand, the grain refinement, enhanced with increasing Nb content, has a good effect on cryogenic toughness.
关键词	7%Ni steel Nb content Niobium precipitate Reversed austenite Cryogenic mechanical properties
资助者	Wuhan Iron & Steel Co., Ltd.
DOI	10.1007/s40195-018-0743-3
收录类别	SCI
语种	英语
资助项目	Wuhan Iron & Steel Co., Ltd.
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000442676600008
出版者	CHINESE ACAD SCIENCES, INST METAL RESEARCH
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/129110
专题	中国科学院金属研究所
通讯作者	Luo, Xing-Hong
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China 2.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China 3.Wuhan Iron & Steel Grp Corp, Res & Dev Ctr, Wuhan 430080, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Cao, Hong-Wei,Luo, Xing-Hong,Zhan, Guo-Feng,et al. Influence of Nb Content on Microstructure and Mechanical Properties of a 7%Ni Steel[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2018,31(9):975-982.
APA	Cao, Hong-Wei,Luo, Xing-Hong,Zhan, Guo-Feng,&Liu, Shi.(2018).Influence of Nb Content on Microstructure and Mechanical Properties of a 7%Ni Steel.ACTA METALLURGICA SINICA-ENGLISH LETTERS,31(9),975-982.
MLA	Cao, Hong-Wei,et al."Influence of Nb Content on Microstructure and Mechanical Properties of a 7%Ni Steel".ACTA METALLURGICA SINICA-ENGLISH LETTERS 31.9(2018):975-982.