IMR OpenIR
Effect of Cooling Rate on Microstructure and Effective Grain Size for a Ni-Cr-Mo-B High-Strength Steel
Zhang, Shouqing1,2; Hu, Xiaofeng1; Jiang, Haichang1; Rong, Lijian1
Corresponding AuthorHu, Xiaofeng(xfhu@imr.ac.cn) ; Rong, Lijian(ljrong@imr.ac.cn)
2022-06-16
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Pages11
AbstractThe effect of cooling rate on microstructure and effective grain size (EGS) of a Ni-Cr-Mo-B high-strength steel has been studied by dilatometer, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and electron backscattered diffraction (EBSD). The results show that the microstructure of the Ni-Cr-Mo-B steel is dependent on cooling rate in the following sequence: lath martensite (LM), mixed LM and lath bainite (LB), mixed LB and granular bainite (GB) and GB. The critical cooling rates for appearance of LB and GB are about 10 degrees C/s and 0.5 degrees C/s, respectively. The LM (> 10 degrees C/s) consists of few blocky regions with a width of several micros. Compared with the lath regions, the blocky regions in LM form at higher actual transformation temperatures during cooling. The blocky region area percentage in LM keeps almost constant about 8% at different cooling rates (> 10 degrees C/s) due to similar martensite transformation starting temperature (M-s). The LB percentage in mixed LM/LB increases gradually with decreasing cooling rate (10-0.5 degrees C/s). The EBSD results show that different microstructures have different EGS. The mixed LM/LB exhibits the smallest EGS due to the separation of the prior austenite grains by the pre-formed LB and the refinement of the LM. Meanwhile, the mixed LM/LB at different cooling rates (10-0.5 degrees C/s) exhibits almost the same EGS because the LB and LM in the mixed LM/LB have a similar high-angle grain boundary density and similar EGS. Because the blocky regions contain few high-angle grain boundaries and have similar area percentages in the LM, the LM at different cooling rates (> 10 degrees C/s) exhibits almost the same EGS. The ferrite in GB exhibits as a whole with few high-angle grain boundaries; thus, the mixed LB/GB exhibits the largest EGS.
KeywordNi-Cr-Mo-B steel Cooling rate Microstructural characterization Effective grain size (EGS)
Funding OrganizationLiaoning Revitalization Talents Program ; Strategic Priority Research Program of the Chinese Academy of Sciences
DOI10.1007/s40195-022-01422-6
Indexed BySCI
Language英语
Funding ProjectLiaoning Revitalization Talents Program[XLYC1907143] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDC04000000] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA28040200]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000811965600001
PublisherCHINESE ACAD SCIENCES, INST METAL RESEARCH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/174339
Collection中国科学院金属研究所
Corresponding AuthorHu, Xiaofeng; Rong, Lijian
Affiliation1.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Shouqing,Hu, Xiaofeng,Jiang, Haichang,et al. Effect of Cooling Rate on Microstructure and Effective Grain Size for a Ni-Cr-Mo-B High-Strength Steel[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2022:11.
APA Zhang, Shouqing,Hu, Xiaofeng,Jiang, Haichang,&Rong, Lijian.(2022).Effect of Cooling Rate on Microstructure and Effective Grain Size for a Ni-Cr-Mo-B High-Strength Steel.ACTA METALLURGICA SINICA-ENGLISH LETTERS,11.
MLA Zhang, Shouqing,et al."Effect of Cooling Rate on Microstructure and Effective Grain Size for a Ni-Cr-Mo-B High-Strength Steel".ACTA METALLURGICA SINICA-ENGLISH LETTERS (2022):11.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Zhang, Shouqing]'s Articles
[Hu, Xiaofeng]'s Articles
[Jiang, Haichang]'s Articles
Baidu academic
Similar articles in Baidu academic
[Zhang, Shouqing]'s Articles
[Hu, Xiaofeng]'s Articles
[Jiang, Haichang]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Zhang, Shouqing]'s Articles
[Hu, Xiaofeng]'s Articles
[Jiang, Haichang]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.