材料制备的计算机模拟

以中英合作研制大型铸钢支承辊为例,首先阐述了铸造工艺过程的计算机模拟过程,包括充型过程的速度场、凝固过程的温度场以及微观组织等轴晶与柱状晶的转变和它们之间的竞相生长.其次,对带钢热轧过程中的组织演化和性能进行了模拟和预报;同时采用具有自主知识产权的深过冷热机械处理获得梯度细晶显微组织,认为通过轧制形变前的深过冷进一步降低形变温度是获得超细晶粒的关键.最后,提出多尺度模拟与集成是今后材料制备计算机模拟的发展方向.

Computer simulation on materials processing

The casting process of a large-size back-up steel roll was simulated by computer, including the filling velocity field, solidification temperature field, the transformation and the competition growth of equiaxed crystals and column crystals. Then the microstructural evolution and the properties of a strip steel were simulated and predicted. It is found that by a thermo-mechanical treatment under severe undercooling, an ultra-fine and gradient grain structure can be obtained. Finally, it is pointed out that multi-scale and integration simulation will be the developing trend for simulation on materials processing.