C and Mn Elements Characterization and Stability of Retained Austenite in Different Locations of Quenching and Partitioning Bainite Steels

doi:10.11900/0412.1961.2018.00270

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	C and Mn Elements Characterization and Stability of Retained Austenite in Different Locations of Quenching and Partitioning Bainite Steels
	Tian Yaqiang 1; Tian Geng 1; Zheng Xiaoping 1; Chen Liansheng 1; Xu Yong 1,2; Zhang Shihong 2
通讯作者	Chen Liansheng(kyckfk@ucst.edu.cn)
	2019-03-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	55 期号:3 页码:332-340
摘要	The 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.
关键词	quenching and partitioning bainitic steel retained austenite in different locations C and Mn elements distribution stability of retained austenite TRIP effect
DOI	10.11900/0412.1961.2018.00270
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000457467900005
出版者	SCIENCE PRESS
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/131770
专题	中国科学院金属研究所
通讯作者	Chen Liansheng
作者单位	1.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
推荐引用方式 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.