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Acta Metall Sin  2010, Vol. 46 Issue (9): 1055-1060    DOI: 10.3724/SP.J.1037.2010.00198
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TEXTURE EVOLUTION AND GROWTH OF DIFFERENTLY SIZED GRAINS IN IF STEEL DURING ANNEALING
CHEN Weiye, TONG Weiping, ZHANG Hui, ZHAO Xiang, ZUO Liang
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819
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CHEN Weiye TONG Weiping ZHANG Hui ZHAO Xiang ZUO Liang. TEXTURE EVOLUTION AND GROWTH OF DIFFERENTLY SIZED GRAINS IN IF STEEL DURING ANNEALING. Acta Metall Sin, 2010, 46(9): 1055-1060.

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Abstract  

Interstitial free (IF) steel sheet has been widely used in automotive industry for its excellent deep drawabilities, which are most strongly influenced by textures formed after annealing. It is well known that the conventional annealing texture of IF steel consists of partial $\alpha$ fiber texture (<110>//rolling direction, RD) and γ fiber texture (<111>//normal direction, ND) which benefits the deep drawabilities, i.e., the stronger the development of the γ fiber texture parallel to the sheet plane, the better the deep drawabilities. Recently, many results showed that the grain size distribution in IF steel during the grain growth has apparent influence on the properties, whereas the impact of the grain size distribution on the texture has not been well discussed. The present work uses EBSD to investigate the grain size and textures of small, medium and large grains of IF steel sample, which was cold rolled to a reduction of 80% and subsequently annealed at 710 and 770 ℃ for various hold times. The results showed that the impact of the annealing temperature is more important for the growth rate and texture characteristics of grain than the hold time, which means the growth rate and texture characteristics are entirely distinct at different annealing temperature. At the same annealing temperature, the textures of different groups of grain are similar at different hold times whereas its intensity increased with the duration. In different groups of grain, the relationships between the texture and the average grain size can be described by the empirical formula from the experiment data.

Key words:  texture      grain growth      grain size distribution      interstitial free (IF) steel     
Received:  26 April 2010     
Fund: 

Supported by National Natural Science Foundation of China (No.50871026), Program of Introducing Talents of Discipline to University (No.B07015), Foundation for the Author of National Excellent Doctoral Dissertation of China (No.200745), Program for New Century Excellent Talents in University (No.NCET-06-0288}), Fundamental Research Funds for the Central Universities (No.N090109001)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00198     OR     https://www.ams.org.cn/EN/Y2010/V46/I9/1055

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