極低炭素冷延鋼板のγ値におよぼす冷延条件の影響
1990 年 76 巻 1 号 p. 50-56
詳細
1990 年 76 巻 1 号 p. 50-56
The effect of metallurgical factors on the γ-value of cold rolled steel sheet has been reported by many researchers. However the number of reports with regard to the mechanical factors on the γ-value is quite few. In this study, the effects of roll diameter, thickness of the steel and reduction per pass on the γ-value of extra low carbon cold rolled steel sheet has been examined and discussed using the results obtained by rigid finite element method.
(1) γ-value of cold rolled and annealed steel sheet increases with increase in roll diameter and decrease in initial thickness at the cold rolling.
(2) When the changes in thickness and reduction per pass during continuous cold rolling are considered, γ-value shows a good relationship with the sum of {Roll diameter (Di) / Thickness (tmi)} and cold reduction of each pass.
(3) The decrease in γ-value with decrese in {Roll diameter (D) / Initial thickness (to)} relates with the increase in shear strain in the surface region of the sheet. That is, the deterioration of γ-value with decrease in this parameter is brought about by formation of the unfavorable texture in surface region for deep drawability originated by shear strain.
