超级钢细晶轧制过程中再结晶及γ晶粒尺寸的模拟计算  

Modelling of recrystallization behaviors and the evolution of -γ- grain size during grain - refining rolling of super - steel

作　　者：许云波[1] 于永梅[1] 刘相华[1] 王国栋[1] 

机构地区：[1]东北大学 轧制技术及连轧自动化国家重点实验室,辽宁沈阳110004

出　　处：《材料科学与工艺》2002年第3期237-241,共5页Materials Science and Technology

基　　金：国家重大基础研究973资助项目(G1998061509);辽宁省自然科学基金资助项目(2001101021).

摘　　要：建立了低碳钢和HSLA钢热变形过程中动态、亚动态及静态再结晶的数学模型,描述了板带热连轧过程中奥氏体晶粒尺寸演变和再结晶行为,讨论了轧制规程和钢种成分对再结晶动力学和奥氏体晶粒细化的影响.结果表明:在400 MPa超级钢轧制工艺条件下,奥氏体动态再结晶主要发生在温度较高的粗轧阶段,而静态及亚动态再结晶在粗轧及精轧前几道次发生的非常充分,在精轧后几道次很难充分发生;奥氏体晶粒最终尺寸随着终轧温度的降低而减小,并且HSLA钢和c-Mn钢相比,相同的轧制工艺和温度制度下,前者奥氏体晶粒要更细一些;模型的计算结果与实测值进行对比吻合良好.The recrystallization kinetics model was developed to describe the evolution of γ - grain size and the softening caused by recrystallization in low carbon and HSLA steels. The effects of rolling schedule and chemical composition on recrystallization and the austenite grain refinement were discussed. The simulated results show that dynamic recrystallization ( followed by meta - dynamic recrystallization) occurs mostly in roughing and full static recrystallization becomes difficult to take place in the later passes of finishing during rolling of 400 MPa super - steel. On the other hand, the final austenite grain size decreases with decreasing finishing temperature and the microalloyed steel has a smaller grain size than the C - Mn steel under the same technological conditions. The prediction of these models is in good agreement with measurements.

关 键 词：细晶轧制过程 模拟计算 超级钢 热连轧 晶粒尺寸 亚动态结晶 低碳钢 HSLA钢 

分 类 号：TG335.11[金属学及工艺—金属压力加工] TG331