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Acta Metall Sin  2012, Vol. 48 Issue (10): 1166-1174    DOI: 10.3724/SP.J.1037.2012.00173
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TEXTURES AND PRECIPITATES IN A 17%Cr FERRITIC STAINLESS STEELS
GAO Fei 1, LIU Zhenyu 1, ZHANG Weina 1, LIU Haitao 1, SUN Guangting 2,WANG Guodong 1
1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819
2. Jigang International Engineering Technolgy Co. Ltd., Jinan 250101
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Abstract  

Improved mechanical properties of ferritic stainless steels (FSSs), such as toughness and high temperature or creep resistance, have been attained through the addition of stabilizing elements such as Nb and/or Ti. Therefore, stabilized ferritic stainless steels are good candidates to replace the conventional Cr–Ni austenitic stainless steels for specific applications to save the higher price of Ni. As compared to austenitic stainless steels, however, ferritic stainless steels possess lower formability which is closely depends on the γ–fiber recrystallization texture. Hence, improvement of formability is desired for further wide applications of FSSs. The stabilizing effects of alloying elements work by consuming not only the interstitial atoms in solid solution but also forming the carbide and nitride precipitates such as TiC, TiN and NbC. The precipitation takes place in steel making processes such as slab reheating, hot rolling and coiling. The parameters involving these processes have their effects on the size, shape and distribution of the precipitates that influence the γ–fiber recrystallization texture. Many papers intended to clarify the effect of precipitates. However, there were differences concerning the effect of precipitates, which may hinder further improvement of formability. In the present paper, precipitate size and dispersion were changed by controlling hot rolling processes and the effect of precipitate size and dispersion on the development of recrystallizaton texture in a 17%Cr ferritic stainless steels was investigated. Mechanical properties were measured by tensile tests. The characteristics of precipitate were observed by transmission electron microscopy, and X–ray diffraction was used to characterize texture evolution processes. The results show that low temperature finish rolling promotes the formation of a large number of fine and dispersed TiC precipitates in the hot band. After rolling and annealing, the state of fine and dispersed precipitation can be inherited in the cold rolled and annealed sheets. Strong γ–fiber recrystallizaton texture is developed in the specimen with sparsely distributed and coarse precipitates. Fine and dispersed precipitates promote the nucleation of randomly oriented grains, strongly suppress the growth of recrystallized grain, and thereby weakening γ–fiber recrystallizaton texture and impairing the formability of the cold rolled and annealed sheets. The precipitates have significant effects on the nucleation of randomly oriented grains and pinning grain boundary mobility during recrystallization annealing after cold rolling, which plays an important roles in controlling the γ–fiber recrystallizaton texture in a ferritic stainless steels.

Key words:  17%Cr ferritic stainless steel      precipitate      texture      recrystallization     
Received:  05 April 2012     
ZTFLH:  TG113  
Fund: 

Supported by National Natural Science Foundation of China (Nos.50734002 and 51004035) and Fundamental Research Funds for the Central Universities (No.N100507002)

Cite this article: 

GAO Fei LIU Zhenyu ZHANG Weina LIU Haitao SUN Guangting WANG Guodong. TEXTURES AND PRECIPITATES IN A 17%Cr FERRITIC STAINLESS STEELS. Acta Metall Sin, 2012, 48(10): 1166-1174.

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00173     OR     https://www.ams.org.cn/EN/Y2012/V48/I10/1166

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