成形用高強度熱延鋼板のγ値面内異方性におよぼす添加元素と圧延条件の影響

概要

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Planar anisotropy of γ value (⊿γ=∣(γ_0+γ_<90>)/2-γ_<45>∣) of Nb-treated high strength hot-rolled steel sheet is usually high. The way for decreasing ⊿γ was studied with laboratory melted materials and experimental rolling mill. Mechanism which leads to the increase of ⊿γ can probably be explained as follows : The rolling conditions such as rolling sequence or lubrication may affect the development of austenite texture in a temperature range where recrystallization does not take place. This texture is inherited by ferrite through the γ-α transformation. Unidirectional rolling makes ⊿γ higher than reverse rolling and water-lubrication or no-lubrication makes ⊿γ higher than oil-lubrication. Ti, V, Mo do not have such a strong effect of increasing the lowest temperature of γ recrystallization (Tc) as Nb does. So these elements are suitable to the additions for decreasing ⊿γ of high strength hot-rolled steel sheet for deep drawing.
社団法人日本鉄鋼協会の論文
1981-04-01