1973 Volume 59 Issue 3 Pages 469-492
An investigation has been carried out to clarify the effect of carbide forming elements as Ta, Nb and Zr on the drawability and the recrystallization texture of cold-rolled low carbon steel sheets. Prior to cold rolling, a reheating treatment of hot bands is given so that C and N in solution in steel may precipitate as carbide and nitride.
The results obtained are as follows:
1. The addition of Ta, Nb, Ti, and Zr is so effective to improve γ value of low carbon steel sheets.
2. When a proper reheating treatment in given prior to cold rolling, the γ value increase remarkably with an increase of the atomic ratio of Ta to (C+N) and shows a maximum at the ratio of about 1·1.
3. As to the recrystallization texture, the (111) fiber texture develops remarkably in the sheet containing no carbon in solution while the (111) texture becomes weak with an increase of carbon content. A study of the effect of carbide size on the recrystallization texture shows that carbide larger than about 500Å increase (200) and decrease (222) pole intensities.
4. The cold rolling texture has a close relationship with the concentration of carbon in solution. The absence of carbon and tantalum in solution develops in the cold-rolled sheet the {211}‹011› texture which is considered preferable for the development of the near {111}‹112› texture during the recrystallization process.
5. It is concluded that the high γ value obtained in Ta bearing low carbon steel sheets is attributed mainly to the absence of carbon in solution by means of the reheating treatment prior to cold rolling.
