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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
Corresponding AuthorLuo Xinghong(xhluo@imr.ac.cn)
2011-06-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume47Issue:6Pages:688-696
AbstractUltra-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.
Keywordultra-purified ferrite stainless steel micro-alloying as-cast structure equiaxed interstitial element Ti and Nb stabilization
Funding OrganizationNational Natural Science Foundation of China
DOI10.3724/SP.J.1037.2011.00059
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[50734002]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000292787700007
PublisherSCIENCE PRESS
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/103996
Collection中国科学院金属研究所
Corresponding AuthorLuo Xinghong
AffiliationChinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
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.
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