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C and Mn Elements Characterization and Stability of Retained Austenite in Different Locations of Quenching and Partitioning Bainite Steels
Tian Yaqiang1; Tian Geng1; Zheng Xiaoping1; Chen Liansheng1; Xu Yong1,2; Zhang Shihong2
Corresponding AuthorChen Liansheng(kyckfk@ucst.edu.cn)
2019-03-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume55Issue:3Pages:332-340
AbstractThe volume fraction and stability of retained austenite play an important role in the performance of low carbon steels, while the C and Mn elements have a stabilizing effect on the thermal stability and mechanical stability of retained austenite. Therefore, the C and Mn elementals partitioning was promoted by intercritical annealing. As a result, the mechanical properties of the low carbon steels are improved. The microstructure of quenching and partitioning bainitic steels and retained austenite characteristics were studied by means of SEM, TEM and XRD. The partitioning and content of C and Mn elements in retained austenite at different locations were characterized by EPMA, EBSD and nanoindentation. The effect of C and Mn elements on the stability of retained austenite at different locations and phase change law of retained austenite were investigated by combining the tensile stress-strain curves under the treatment of intercritical annealing (partial austenitizing)-quenching and partitioning in the bainitic region process (IQ&PB). In the process of tensile deformation, the transformation induced plasticity (TRIP) effect occurs, the volume of retained austenite decreases, the transformation takes place preferentially in the ferrite grain boundary, and finally occurs between the bainite laths. C and Mn elements have a stabilizing effect on the retained austenite, which make retained austenite is not prone to phase change. The stress at the tensile fracture is concentrated, and the retained austenite is completely transformed into martensite. The volume fraction of retained austenite is 3.12% and 5.03% at 2 mm and 4 mm distances away from the fracture. Film-like retained austenite is more stable than blocky retained austenite, and the retained austenite of the <111>(gamma) crystal orientation is unstable and easily transforms into martensite.
Keywordquenching and partitioning bainitic steel retained austenite in different locations C and Mn elements distribution stability of retained austenite TRIP effect
DOI10.11900/0412.1961.2018.00270
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000457467900005
PublisherSCIENCE PRESS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/131770
Collection中国科学院金属研究所
Corresponding AuthorChen Liansheng
Affiliation1.North China Univ Sci & Technol, Minist Educ Modern Met Technol, Key Lab, Tangshan 063210, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Tian Yaqiang,Tian Geng,Zheng Xiaoping,et al. C and Mn Elements Characterization and Stability of Retained Austenite in Different Locations of Quenching and Partitioning Bainite Steels[J]. ACTA METALLURGICA SINICA,2019,55(3):332-340.
APA Tian Yaqiang,Tian Geng,Zheng Xiaoping,Chen Liansheng,Xu Yong,&Zhang Shihong.(2019).C and Mn Elements Characterization and Stability of Retained Austenite in Different Locations of Quenching and Partitioning Bainite Steels.ACTA METALLURGICA SINICA,55(3),332-340.
MLA Tian Yaqiang,et al."C and Mn Elements Characterization and Stability of Retained Austenite in Different Locations of Quenching and Partitioning Bainite Steels".ACTA METALLURGICA SINICA 55.3(2019):332-340.
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