EFFECT OF Ti AND Nb MICRO-ALLOYING ON THE MICROSTRUCTURE OF THE ULTRA-PURIFIED 11%Cr FERRITE STAINLESS STEELS

doi:10.3724/SP.J.1037.2011.00059

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	EFFECT OF Ti AND Nb MICRO-ALLOYING ON THE MICROSTRUCTURE OF THE ULTRA-PURIFIED 11%Cr FERRITE STAINLESS STEELS
	Liu Jing; Luo Xinghong; Hu Xiaoqiang; Liu Shi
刊名	ACTA METALLURGICA SINICA
	2011-06-11
卷号	47 期号:6 页码:688-696
关键词	ultra-purified ferrite stainless steel micro-alloying as-cast structure equiaxed interstitial element Ti and Nb stabilization
ISSN号	0412-1961
DOI	10.3724/SP.J.1037.2011.00059
通讯作者	Luo Xinghong(xhluo@imr.ac.cn)
英文摘要	Ultra-purified ferrite stainless steels (UP-FSS) are widely used in the fields of automobile, household appliances etc. Much better performance than conventional ferrite stainless steels is obtained by minimizing the interstitial elements level in UP-FSS. However, some negative effects, such as degradation of the formability and ridging-resistance, are also brought by purifying the steels, which lead to abnormally growth of the columnar grains. Moreover, the grains in heat affected zone (HAZ) are apt to coarsen during welding process. One of the effective ways to resolve such problems is to increase the equiaxial grain ratio in as-cast microstructure and refine the grain size. Micro-alloying of steels with strong carbide and nitride former, such as Ti and Nb, is a way to do that. In this work, the effects of Ti and Nb micro-alloying on the as-cast, as-rolled, and HAZ microstructures of the ultra-purified 11%Cr ferrite stainless steels with different interstitial element levels were investigated by both experimental research and thermodynamic calculation. The results indicated that the effect of Ti and Nb micro-alloying was better when the content of C and N in the steel was 0.0163%, which showed the minimum grain size in as-cast, as-rolled, and HAZ microstructures, and the equiaxial grain ratio in as-cast microstructure was evidently improved as well. It was found by calculation that, with increasing of C and N content and addition of Ti and Nb to the steels, the solid-liquid two-phase region was broadened. This was beneficial to increase the undercooling in front of the liquid-solid interface and the probability of heterogeneous nucleation, and consequently, increase the equiaxial grain ratio and decrease the mean grain size in as-cast microstructure. On the other hand, with addition of Ti and increase of N content, TiN type particles might precipitate in solid-liquid two-phase region, which was helpful for promoting the heterogeneous nucleation of delta ferrite.
资助项目	National Natural Science Foundation of China[50734002]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000292787700007
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/103995]
专题	金属研究所_中国科学院金属研究所
通讯作者	Luo Xinghong
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Liu Jing,Luo Xinghong,Hu Xiaoqiang,et al. EFFECT OF Ti AND Nb MICRO-ALLOYING ON THE MICROSTRUCTURE OF THE ULTRA-PURIFIED 11%Cr FERRITE STAINLESS STEELS[J]. ACTA METALLURGICA SINICA,2011,47(6):688-696.
APA	Liu Jing,Luo Xinghong,Hu Xiaoqiang,&Liu Shi.(2011).EFFECT OF Ti AND Nb MICRO-ALLOYING ON THE MICROSTRUCTURE OF THE ULTRA-PURIFIED 11%Cr FERRITE STAINLESS STEELS.ACTA METALLURGICA SINICA,47(6),688-696.
MLA	Liu Jing,et al."EFFECT OF Ti AND Nb MICRO-ALLOYING ON THE MICROSTRUCTURE OF THE ULTRA-PURIFIED 11%Cr FERRITE STAINLESS STEELS".ACTA METALLURGICA SINICA 47.6(2011):688-696.