Study On The Effects Of Micro-alloying Element Sn On Microstructure And Texture Development Of Ferritic Stainless Steel

Nickel resources saving and low-cost ferritic stainless steel have been much liked by more and more people due to the exorbitant price of Nickel. In the face of the situation that the shortage of Nickel resources in our country, ferritic stainless steel instead of austenitic stainless steel will be trend of stainless steel industry. With the improvement of smelting technology, it’s possible that high quality of ferritic stainless steel was producted, together with its excellent corrosion resistance, ferritic stainless steel has the potential to overcome their own weaknesses and instead of austenitic stainless steel as major economical civil stainless steel. In recent years, the alloying has become the main idea of perfecting various performance of ferritic stainless steel. By adding alloying elements such as Nb, Ti to fixed C, N, improve the quality of ferritic stainless steel surface, form a good texture, improve the formability of ferritic stainless steel. Adding alloying elements such as Nb, Ti to fixed C, N, which improve the surface quality of ferritic stainless steel, form a good texture and improve the formability of ferritic stainless steel. To improve the corrosion resistance of ferritic stainless steel by adding elements such as Cu, Al, Mo and so on. Sumitomo corporation in Japan, add micro-alloying element Sn to low interstitial ferritic stainless steel to receive good corrosion resistance and formability, which have greatly reduced the production cost of ferritic stainless steel because of the role of Sn that had always been considered as harmful elements in steel have changed. At home, adding micro-alloying element Sn can improve the corrosion resistance of ferritic stainless steel have been confirmed. However, the influence of micro-alloying element Sn on microstructure and the development of texture in ferritic stainless steel is not clear.In this experiment, X-ray diffraction (XRD) and electron back scattering diffraction technology (EBSD) are adopted as the main detection methods, metallographic observation and micro-hardness are adopted as assisted detection means, to study the effects of micro-alloying element Sn on cold rolling texture, recrystallization process, recrystallization texture and microstructure in ferritic stainless steel. Contrast various data of two kinds of ferritic stainless steel to explore the influence of Sn on microstructure and texture development of ferritic stainless steel. Results show that cold rolled texture consists of strong a-fiber texture and the weak y-fiber texture in 0.09%Sn and 0%Sn cold rolled plate. With the increase of the deformation, the strongest point of α-fiber texture in 0.09%Sn and 0%Sn cold rolled plate change from {001}<110> to{112}<110>, the strongest point of y-fiber texture change from {001}<110> to{112}<110>. The changing in 0.09%Sn samples occurred in 70% deformation, and 0%Sn samples occurred in 90% deformation. Recrystallization grains in 0.09%Sn and 0%Sn annealed plate are all γ-orientation, which are born in the y-orientation deformation. With the increase of annealing temperature, small y-oriented recrystallization grains grow up firstly, the recrystallization texture in 0.09%Sn and 0%Sn annealed plate are γ-orientation, which deviating from the{111}<112> some angles, recrystallization mechanism mainly oriented nucleation and select growth. Adding Sn lowered recrystallization temperature of ferritic stainless steel, promoted the recrystallized process. Adding Sn refined recrystallized structure in the ferritic stainless steel.