連続焼鈍の冷却速度制御による {111} 集合組織発達機構(一次再結晶と集合組織)(<特集>再結晶・粒成長)

概要

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The effect of the cooling rate during γ→α transformation on Lankford (γ^^-) values and textures has been investigated in low and extra-low carbon cold rolled steel sheets. (1) γ^^--values increase, {111} textures develop and grain-sizes enlarge with decrease in the cooling rate during γ→α transformation in both steels. (2) These phenomena appear more distinctly in the extra-low carbon steel than in the low carbon steel. (3) Among the following steps (A) to (D), {111} texture develops most intensively during slow cooling step (D), (A) : during heating before γ-transformation, (B) : during heating after progress of γ-transformation, (C) : during holding and (D) : during slow cooling. (4) The development of {111} texture is suppressed by intermediate holding after rapid cooling at a low temperature in dual phase or at a high temperature in a single α-phase region. (5) These results can be reasonably explained by the application of the previous theory proposed by the author on the formation mechanism of α→γ→α transformation texture. That is, {111} texture develops as the results of the fact that the growth of residual α-grains is preferred to the nucleation of new α-grains during slow progress of γ→α transformation.
社団法人日本鉄鋼協会の論文
1984-11-01