EFFECT OF Mn PRE-PARTITIONING ON C PARTITIONING AND RETAINED AUSTENITE OF Q&P STEELS

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	EFFECT OF Mn PRE-PARTITIONING ON C PARTITIONING AND RETAINED AUSTENITE OF Q&P STEELS
	Chen Liansheng 1; Zhang Jianyang 1; Tian Yaqiang 1; Song Jinying 1; Xu Yong 1,2; Zhang Shihong 2
通讯作者	Chen Liansheng(kyc@heuu.edu.cn)
	2015-05-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	51 期号:5 页码:527-536
摘要	The chemical compositions of C and Mn have a strong influence on the stability of the metastable retained austenite at room temperature. In the intercritical annealing process, Mn element improves the stability of the austenite by partitioning from ferrite to austenite and the enrichment of Mn in austenite can also impact on the diffusion of C element from martensite to retained austenite in partitioning process. Based on C partitioning, Mn partitioning can further improve the product of strength and elongation, and has no negative effect on weldability of the low carbon high strength steel. Thus, it can effectively solve the contradiction between mechanical property and weldability of low carbon high strength steel in traditional quenching-partitioning (Q&P) process. In this case, it is of great significance to study the Mn pre-partitioning mechanism and its influence on C partitioning and retained austenite of the low carbon high strength steel. Therefore, one low alloy C-Si-Mn steel was studied in the present work. The Mn pre-partitioning behavior and its effect on C partitioning and the stability of the retained austenite were investigated by means of intercritical heating-quenching (IQ) process, Q&P and intercritical heating-austenitizing-quenching-partitioning (I&Q&P) process. The results showed that during the process of phase transformation in the intercritical reheating, C and Mn elements constantly diffused from ferrite to austenite. When this process ended, C and Mn elements enriched in austenite. While Mn element in microstructure at room temperature was still enrichment and C element enriched regularly between the martensite laths in the I&Q&P treated steel. With the increase of C partitioning time in both Q&P and I&Q&P process, the tensile strength of steel was decreased constantly, while the elongation showed an increasing fristly and then decreasing trend. The product of strength and elongation of the steel treated by I&Q&P process reached 23478 MPa % with the C partitioning time of 90 s. The more austenite in martensite phase would be obtained after the first quenching with the Mn pre-partitioning. It was important to prompt more C diffusing into austenite during C partitioning process to stabilize more retained austenite at room temperature of the steel after the second quenching. With the same experimental conditions, the retained austenite of the combined effects of C and Mn partitioning during I&Q&P process would be increased 2.4% than the effect of C partitioning during Q&P process.
关键词	Mn partitioning C partitioning retained austenite product of strength and elongation
资助者	National Natural Science Foundation of China ; Natural Science Foundation of Hebei Province ; Science Foundation of Department of Education of Hebei Province
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51254004] ; National Natural Science Foundation of China[51304186] ; Natural Science Foundation of Hebei Province[E2014209191] ; Science Foundation of Department of Education of Hebei Province[YQ2013003]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000355388000003
出版者	SCIENCE PRESS
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/81063
通讯作者	Chen Liansheng
作者单位	1.Hebei United Univ, Hebei Key Lab Modern Met Technol, Tangshan 063009, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Chen Liansheng,Zhang Jianyang,Tian Yaqiang,et al. EFFECT OF Mn PRE-PARTITIONING ON C PARTITIONING AND RETAINED AUSTENITE OF Q&P STEELS[J]. ACTA METALLURGICA SINICA,2015,51(5):527-536.
APA	Chen Liansheng,Zhang Jianyang,Tian Yaqiang,Song Jinying,Xu Yong,&Zhang Shihong.(2015).EFFECT OF Mn PRE-PARTITIONING ON C PARTITIONING AND RETAINED AUSTENITE OF Q&P STEELS.ACTA METALLURGICA SINICA,51(5),527-536.
MLA	Chen Liansheng,et al."EFFECT OF Mn PRE-PARTITIONING ON C PARTITIONING AND RETAINED AUSTENITE OF Q&P STEELS".ACTA METALLURGICA SINICA 51.5(2015):527-536.