528 3ロール多パス連続圧延における炭素鋼オーステナイト組織の変化(OS 加工による材料の機能創製)

Abstract

Change in austenite grain size after continuous bar rolling of S45C steel with 3-roll mill is investigated. From the double hot compression test with large plastic strain, when dynamic recrystallization takes place, it becomes clear that final austenite grain size is dominated only by the final deformation, even if inter-pass time is quite short. This proves that the size of final austenite grains, such as coarsened grains,,is affected not by the amount of plastic deformation but by the final forming condition, when the dynamic recrystllization takes place. This is confirmed by experimental results obtained by continuous rolling with 7-stands.