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针对特厚板再结晶型轧制,板坯中心难以变形导致心部晶粒粗大的问题,使用Q345B钢,采用有限元方法建立了特厚板轧制的仿真模型,以研究在特厚板轧制过程中引入厚度方向上的温度梯度对钢板心部应变的影响,并与传统均温轧制进行对比,预测了两种温度场条件下奥氏体再结晶的晶粒尺寸.采用大试样平面应变实验对模拟结果进行验证.研究结果表明,温度梯度轧制有利于增加坯料心部应变量,最大增加了61.35%.计算和实验结果显示温度梯度轧制可以减小特厚板心部晶粒尺寸,晶粒度级别提高了一个等级,说明该工艺对提高特厚板中心区域性能有利.
Aiming at the recrystallization rolling of the plate, the center of the slab is difficult to deform, which leads to the problem of coarse grain in the heart. Q345B steel is used to establish the simulation model of the plate rolling with finite element method. The influence of the temperature gradient in the thickness direction on the strain at the core of the steel plate was introduced into the process and the grain size of the recrystallized austenite under two temperature fields was predicted by comparison with the conventional temperature- The results of plane strain experiments verify the simulation results.The results show that the temperature gradient rolling helps to increase the amount of strain at the core of the blank, the maximum increase of 61.35% .The calculation and experimental results show that the temperature gradient rolling can reduce the thickness of the heart-shaped crystal Grain size, grain size level increased by a grade, indicating that the process to improve the performance of the central area of special plate benefits.