共查询到17条相似文献,搜索用时 670 毫秒
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采用计算机对高速线材生产过程进行模拟,开发出具有较高准确度同时具有对不同轧制工艺有较好通用性的高线生产仿真系统。利用有限元方法计算了线材在待轧、轧制、水冷及风冷过程的温度场;通过对再结晶动力学模型的解析,得到了静态再结晶、动态再结晶的分数以及奥氏体晶粒在轧制过程中的变化情况;通过组织演变模型和温度模型的耦合计算,模拟出斯太尔摩风冷线上线材的组织变化过程;建立了利用初始化学成分和组织组成预测高线产品力学性能的BP神经网络模型,通过生产过程数据的训练,实现了对线材力学性能的预测。仿真计算的结果对线材控轧、控冷工艺的改进有一定的指导意义。 相似文献
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通过热连轧带钢温度场的有限元分析以及带钢热连轧过程的再结晶动力学和应变累积的研究,建立了精轧过程平均流变应力模型:静态再结晶平均流变应力σk=k1 exp{0.126-1.75[C] 0.594[C]^2 (2851 2968[C]-1120[C]^2)/T/ε^0.21ε^0.13,其中T-再结晶温度/K,ε-应变,ε-应变速率/s^-1,k1-系数;动态再结晶平均流变应力σD=9.8σB(1-Xdyn) 1.14σBB Xdyn,其中Xdyn-动态再结晶率,σBB-动态再结晶进入稳态时应力。X46级管线钢(%:0.07C-0.97Mn-0.33Si-0.018Nb)工业轧制时轧制压力的实测数据与该模型预测数据吻合良好。 相似文献
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建立了C-Mn钢在控制轧制和控制冷却生产中微观组织演变和力学性能预测的物理冶金模型。模型包括加热、再结晶、相变和力学性能四部分,分别描述了中厚板热轧及冷却过程中的物理冶金现象。根据现场数据,计算了轧制过程奥氏体晶粒尺寸和再结晶分数的演变,预测了在不同工艺条件下连续冷却转变各相的体积分数和铁素体的晶粒尺寸等显微组织参数和相关的力学性能,预测结果和实测值吻合较好。 相似文献
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本文建立了C-Mn钢在控制轧制和控制冷却生产中微观组织演变和力学性能预测的物理冶金模型。模型包括加热、再结晶、相变和力学性能四部分,分别描述了中厚板热轧度冷却过程中的物理冶金现象。根据现场数据,计算了轧制过程奥氏体晶粒尺寸和再结晶分数的演变,预测了在不同工艺条件下连续冷却转变各相的体积分数和铁素体的晶粒尺寸等显微组织参数和相关的力学性能,预测结果和实测值吻合较好。 相似文献
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Prediction of Rolling Load, Recrystallization Kinetics, and Microstructure During Hot Strip Rolling 总被引:1,自引:0,他引:1
The recrystallization kinetics and grain size models were developed for the C Mn and niobium containing steels to describe the metallurgical phenomenon such as softening, grain growth, and strain accumulation. Based on the recrystallization kinetics equations, the mean flow stress and the rolling load of each pass were predicted and the optimum rolling schedule was proposed for hot strip rolling. The austenite grain refinement is associated with the addition of niobium, the decrease of starting temperature of finish rolling, and the reduction of finished thickness. The mean flow stress curve with a continuous rising characteristic can be usually observed in the finish rolling of niobium containing steel, which is formed as a result of the heavy incomplete softening and strain accumulation. The predicted rolling loads are in good agreement with the measured ones. 相似文献
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Considering the characteristics of large cylindrical shell rolling, such as double driving rolls, asymmetrical rolling and huge workpiece, a slab method was developed to establish the rolling force model. In this model, the non- uniform normal and shear stresses and the upper and lower surface temperatures of the workpiece were taken into ac- count. Moreover, the flow stress model, considering the dynamic recovery and dynamic recrystallization behaviors of the material, was established. The rolling pressure distribution, the rolling force, the rolling torque and the neutral points could be calculated quickly and easily by the roiling force model. The predicted results were shown to be in good agreement with the measured values, which indicated that the model can satisfy the requirement of industrial application. 相似文献
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