基于3D-CAFE法的连铸Ag-28Cu合金凝固组织的数值模拟

Numerical Simulation of Solidification Structures of Ag-28Cu Alloy Continuous Casting Based on 3D-CAFE Method

基于3D-CAFE法对连铸法制备的Ag-28Cu合金的凝固组织进行了模拟,研究了表面换热系数、浇注温度和拉速对凝固组织的影响。结果表明,增大表面换热系数、降低浇注温度、提高拉速,可起到细化晶粒的效果。在最佳工艺条件为表面换热系数1800 W/(m2·K)、浇注温度830℃、拉速1.5 m/min时,Ag-28Cu合金的凝固组织等轴晶比例最大,且晶粒较细。

Based on 3D-CAFE method, the solidification structures of the Ag-28Cu alloy continuouscasting is simulated, and the effects of surface heat transfer coefficient, pouring temperature and castingspeed on solidification structure were studied. The results show that by increasing the surface heat transfercoefficient, reducing the pouring temperature and improving the drawing speed, which can have thebeneficial effect to grain refinement. Under the best process conditions, that is： the surface heat transfercoefficient is 1800W/（m2·K）,the pouring temperature is 830℃, the casting speed is 1.5 m/min, Ag-28Cualloy solidification structure have the largest proportion of equiaxed grains and the finer grain size.