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Effect of Nanoscale Cu-Riched Clusters on Strength and Impact Toughness in a Tempered Cu-Bearing HSLA Steel
Du, Yubin1,2; Hu, Xiaofeng1; Song, Yuanyuan1; Zhang, Yangpeng1; Rong, Lijian1
Corresponding AuthorHu, Xiaofeng(xfhu@imr.ac.cn) ; Rong, Lijian(ljrong@imr.ac.cn)
2021-07-10
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Pages14
AbstractThe effect of Cu-riched clusters on strength and impact toughness in a tempered Cu-bearing high-strength low-alloy (HSLA) steel is investigated. With increasing the tempering temperature, it is found that the yield strength increases firstly, achieving the maximum value (similar to 1053 MPa) at the tempering temperature of 450 degrees C, and then decreases significantly with the rise of tempering temperature. The tempering temperature-dependent yield strength is closely related to the precipitation of Cu-riched clusters. When tempering at 450 degrees C, the peak strength will be reached as the nanoscale Cu-riched clusters with small size and high number density will cause a strong precipitation strengthening (similar to 492 MPa) due to the dislocation shearing mechanism. However, the Cu-riched clusters will coarsen with further increasing tempering temperature, resulting in obvious decrement of yield strength owing to the dislocation bypassing mechanism. Compared with the yield strength, the variation in impact energy displays an inverse tendency and the impact energy is only 7 J for the sample tempered at 450 degrees C. The fracture mode can be well explained by the competition between the cleavage fracture strength (sigma(F)) and "yield strength" (sigma(Y)). Although transgranular cleavage fracture can be found in samples tempered at 450 and 550 degrees C, the crack propagation along the lath boundaries is prevented in the sample tempered at 550 degrees C. The reason is that the number density of Cu-riched clusters at lath boundaries decreases and the segregation of Mo element at the lath boundaries is induced, which will increase the bonding energy.
KeywordHigh-strength low-alloy (HSLA) steel Cu-riched cluster Strengthening mechanism Lath boundary Impact energy
Funding OrganizationNational Key Research and Development Program of China ; Liaoning Revitalization Talents Program ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Liaoning Natural Science Foundation
DOI10.1007/s40195-021-01277-3
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFB0300601] ; Liaoning Revitalization Talents Program[XLYC1907143] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDC04000000] ; Liaoning Natural Science Foundation[2020-MS-008]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000672443800001
PublisherCHINESE ACAD SCIENCES, INST METAL RESEARCH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/159979
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
Du, Yubin,Hu, Xiaofeng,Song, Yuanyuan,et al. Effect of Nanoscale Cu-Riched Clusters on Strength and Impact Toughness in a Tempered Cu-Bearing HSLA Steel[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2021:14.
APA Du, Yubin,Hu, Xiaofeng,Song, Yuanyuan,Zhang, Yangpeng,&Rong, Lijian.(2021).Effect of Nanoscale Cu-Riched Clusters on Strength and Impact Toughness in a Tempered Cu-Bearing HSLA Steel.ACTA METALLURGICA SINICA-ENGLISH LETTERS,14.
MLA Du, Yubin,et al."Effect of Nanoscale Cu-Riched Clusters on Strength and Impact Toughness in a Tempered Cu-Bearing HSLA Steel".ACTA METALLURGICA SINICA-ENGLISH LETTERS (2021):14.
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