CAJ | 학술논문

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.
침대특후판재결정형알제，판배중심난이변형도치심부정립조대적문제，사용Q345B강，채용유한원방법건립료특후판알제적방진모형，이연구재특후판알제과정중인입후도방향상적온도제도대강판심부응변적영향，병여전통균온알제진행대비，예측료량충온도장조건하오씨체재결정적정립척촌.채용대시양평면응변실험대모의결과진행험증.연구결과표명，온도제도알제유리우증가배료심부응변량，최대증가료61.35%.계산화실험결과현시온도제도알제가이감소특후판심부정립척촌，정립도급별제고료일개등급，설명해공예대제고특후판중심구역성능유리.
A finite element model of Q345B ultra-heavy plate rolling was established and the effect of temperature gradient on the strain in the plate core was investigated during the rolling process. The grain size after austenite recrystallization was calculated and compared with tradition processes. The result of simulation was proved by large specimen plane stain experiment and indicated that the process with temperature gradient is favor of strain increasing in the plate core, and the maximum of increment is 61. 35%. The calculation and experiment proclaim that the grain size in the plate core is refined by temperature gradient rolling, moreover, increasing the mechanical properties of the ultra-heavy plate.