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Influence of Nb Content on Microstructure and Mechanical Properties of a 7%Ni Steel
Cao, Hong-Wei1,2; Luo, Xing-Hong2; Zhan, Guo-Feng3; Liu, Shi2
Corresponding AuthorLuo, Xing-Hong(xhluo@imr.ac.cn)
2018-09-01
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Volume31Issue:9Pages:975-982
AbstractThe 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.
Keyword7%Ni steel Nb content Niobium precipitate Reversed austenite Cryogenic mechanical properties
Funding OrganizationWuhan Iron & Steel Co., Ltd.
DOI10.1007/s40195-018-0743-3
Indexed BySCI
Language英语
Funding ProjectWuhan Iron & Steel Co., Ltd.
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000442676600008
PublisherCHINESE ACAD SCIENCES, INST METAL RESEARCH
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/129110
Collection中国科学院金属研究所
Corresponding AuthorLuo, Xing-Hong
Affiliation1.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
Recommended Citation
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.
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