控制轧制过程中显微组织演变的计算机模拟和工艺优化

COMPUTER SIMULATION OFMICRSTRUCTURAL EVOLUTION ANDPROCESS OPTIMIZATION DURINGCONTROLLED ROLLING

通过模拟线、棒材实际轧制条件下的组织演变过程,并结合控制轧制理论,提出几种不同于原有轧制条件的工艺。模型模拟计算的结果表明,改变初始的轧制条件,如降低轧制过程中各道次的变形温度或降低终轧区的变形温度、增加末道次应变速率等方法均有利于最终轧制道次奥氏体晶粒尺寸的减小。为模拟计算所开发的模型实现了可视化,大大方便了过程模拟,同时也为经济有效地优化加工工艺提供条件。在轧制过程中,合理控制产品的微观晶粒尺寸为后续钢材冷却处理提供组织上的保证,同时也可提高成品的综合力学性能。

New technological systems, different from the original rolling conditions, are mentioned by the simulation of the microstructural evolution of wire/rod rolling and combination with controlled rolling theory. Simulation results show that it is helpful to reduce the grain size of austenite at the final pass for changing the original rolling processes such as decreasing deformation temperatures at all passes or at finish rolling block, increasing the strain rate at final pass etc. The visual program for simulation is developed and makes simulating process convenient so much. In addition, it is effective and economical to optimize the rolling processes. During controlled rolling, proper control can prepare good microstructure for the later cooling process and the comprehensive mechanical properties of product is also advanced.