| 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 Author | Luo, Xing-Hong(xhluo@imr.ac.cn) |
| 2018-09-01 | |
| Source Publication | ACTA METALLURGICA SINICA-ENGLISH LETTERS
 |
| ISSN | 1006-7191 |
| Volume | 31Issue:9Pages:975-982 |
| Abstract | 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. |
| Keyword | 7%Ni steel Nb content Niobium precipitate Reversed austenite Cryogenic mechanical properties |
| Funding Organization | Wuhan Iron & Steel Co., Ltd. |
| DOI | 10.1007/s40195-018-0743-3 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | Wuhan Iron & Steel Co., Ltd. |
| WOS Research Area | Metallurgy & Metallurgical Engineering |
| WOS Subject | Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000442676600008 |
| Publisher | CHINESE ACAD SCIENCES, INST METAL RESEARCH |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/129110 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Luo, Xing-Hong |
| Affiliation | 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 |
| 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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