薄板坯连铸连轧过程中的静态软化行为

采用本钢Gleeble-2000热/力模拟试验机模拟了本钢薄板坯连铸连轧过程中奥氏体的静态软化行为.结果表明:与不含Nb钢相比,含Nb钢明显抑制了奥氏体的静态再结晶,软化率曲线出现了平台;与固溶Nb相比,析出Nb对静态再结晶的抑制作用更大;同传统流程相比,薄板坯连铸连轧生产线轧制低碳钢(包括含Nb钢和不含Nb钢)在道次间隔期间的静态再结晶激活能明显提高,更不容易发生静态软化行为.

On the Static Softening Behavior of Sheet Billet During Continuous Casting-Rolling Process

The static softening behavior of the austenite in the sheet billet during continuous casting-rolling was investigated on the Gleeble-2000 thermomechanical simulator in Bensteel.The results revealed some facts as follows by comparison.The Nb-bearing steel inhibits the static recrystallization of austenite more obviously than the steel contains no Nb,with relevant curves showing flat portion. And in the steel,the Nb precipitate inhibits the static recrystallization greater than the solid Nb solution.Moreover,the activation of static recrystallization at intervals between two pass reductions for low-carbon steel during continuous casting-rolling is more obviously than that during conventional rolling,i.e.,the static softening behavior is less possible.