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Abstract:The effect of stabilizing elements,such as Nb and Ti,on the microstmcture and properties of low carbon ferritic stainless steel(FSS) has been investigated.The results of the Thermo-calc simulation have shown that the interstitial elements,such as C and N,may be completely stabilized by the addition of Nb and Ti.With the increase of Nb and Ti contents,the a +γtwo phases gradually transfer to a singleα-phase under a high temperature condition,and the content of the carbide M_(23) C_6 gradually decreases.The microstructure has indicated that the combined addition of Nb and Ti can promote the recrystallization of the band structure and form more uniform equiaxed grains.Also,with the increase of Nb and Ti contents,the elongation,the r-value and the corrosion resistance of cold-rolled and annealed sheets are improved prominently.In comparison with the effect of Ti,the addition of Nb is more beneficial to the increase of r-value and the corrosion resistance.
Abstract: The effect of stabilizing elements, such as Nb and Ti, on the microstmcture and properties of low carbon ferritic stainless steel (FSS) has been investigated. The results of the Thermo-calc simulation have shown that the interstitial elements, such as C and N, may be completely stabilized by the addition of Nb and Ti.With the increase of Nb and Ti contents, the a + γtwo changes gradually to a single α-phase under a high temperature condition, and the content of the carbide M_ ( 23) C_6 发明 的 内容. The microstructure has indicated that the combined addition of Nb and Ti can promote the recrystallization of the band structure and form more uniform equiaxed grains. Als with the increase of Nb and Ti contents, the elongation, the r- value and the corrosion resistance of cold-rolled and annealed sheets are improved prominently.In comparison with the effect of Ti, the addition of Nb is more beneficial to the increase of r-value and the corrosion resistance.