IMR OpenIR
Microstructure and Mechanical Properties of HSLA Steel Containing 1.4%Cu
Du Yubin1,2; Hu Xiaofeng1; Zhang Shouqing1,2; Song Yuanyuan1; Jiang Haichang1; Rong Lijian1
Corresponding AuthorRong Lijian(ljrong@imr.ac.cn)
2020-10-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume56Issue:10Pages:1343-1354
AbstractThe Cu bearing high strength low alloy (HSLA) steels exhibit high-strength, high toughness and good weldability, which have been widely used in shipbuilding, offshore structures etc. Due to the extremely poor impact energy when attained peak strength, the Cu bearing HSLA steels are usually used at overaged state, which have a good combination of impact energy and strength. In order to clarify the effect of Cu on mechanical properties especially on the impact energy for HSLA steels at peak ageing state, two HSLA steels without Cu (0Cu) and with 1.4%Cu (1.4Cu), were prepared by vacuum induction melting in this study. The influence of Cu on the microstructure of HSLA steel was investigated by OM, SEM and EBSD. Meanwhile, the Cu-riched clusters were characterized by APT and the mechanical properties were measured by tensile test and impact test. The results show that the Cu is completely solid-solutioned into the matrix after quenching, and there are a great number of Cu-riched clusters precipitated in the matrix and boundaries after tempering. Cu element has no obvious effect on the prior austenite grain size, microstructure and effective grain size of tempered HSLA steel, but has significant influence on the strength and impact energy for tempered HSLA steel. After tempered at 450 degrees C, the 1.4Cu steel attained the maximum yield strength (1053 MPa), higher than that of 0Cu steel. It is worth noting that the impact energy of 1.4Cu steel tempered at 450 degrees C is only 24 J at room temperature and the impact fracture is a quasi-cleavage brittle fracture mode dominated by river patterns. However, 0Cu steel exhibits a completely ductile fracture mode dominated by dimples at room temperature and the impact energy is 127 J. The APT results show that both 0Cu and 1.4Cu tempered steels have the segregation of C, Cr, Ni, Mn elements at the lath boundary. Compared with 0Cu steel, there precipitate a great number of Cu-riched clusters at the lath boundary for 1.4Cu steel, which will result in the stress concentration and then promote the crack initiation at the lath boundary. In addition, the Cu-rich clusters precipitated at the lath boundary could prevent the Mo segregated at the lath boundary, which will decrease the bonding energy and then promote the crack propagation along the lath boundary. Besides, the negative effect of strengthening due to the Cu-riched clusters at matrix will also accelerate the crack propagation in the matrix, which will decrease the impact energy of 1.4Cu steel. Therefore, the impact energy of 1.4Cu steel is much lower than that of 0Cu steel at room temperature.
KeywordHSLA steel Cu lath boundary element segregation impact energy
Funding OrganizationNational Key Research and Development Program of China ; Liaoning Revitalization Talents Program
DOI10.11900/0412.1961.2020.00012
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFB0300601] ; National Key Research and Development Program of China[2017YFB1201302] ; Liaoning Revitalization Talents Program[XLYC1907143]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000571986900004
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/140688
Collection中国科学院金属研究所
Corresponding AuthorRong Lijian
Affiliation1.Chinese Acad Sci, CAS Key Lab Nucl Mat & Safety Assessment, Inst Met Res, 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,Zhang Shouqing,et al. Microstructure and Mechanical Properties of HSLA Steel Containing 1.4%Cu[J]. ACTA METALLURGICA SINICA,2020,56(10):1343-1354.
APA Du Yubin,Hu Xiaofeng,Zhang Shouqing,Song Yuanyuan,Jiang Haichang,&Rong Lijian.(2020).Microstructure and Mechanical Properties of HSLA Steel Containing 1.4%Cu.ACTA METALLURGICA SINICA,56(10),1343-1354.
MLA Du Yubin,et al."Microstructure and Mechanical Properties of HSLA Steel Containing 1.4%Cu".ACTA METALLURGICA SINICA 56.10(2020):1343-1354.
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