基于ProCAST研究冷却速率对新型铁基铸锭凝固过程的影响

Effect of cooling rates on the new-iron casting process based on ProCAST

基于Back Diffusion溶质扩散理论与CAFé模型,采用Pro CAST软件建立了?800 mm×600 mm的新型铁基铸锭铸造过程仿真模型,对选用砂型铸造过程的宏观的温度场,流场和微观组织耦合模拟;分析了凝固过程中铸件的温度场,流场和温度梯度的变化以及可能存在的缺陷;结果表明,离冷铁越近,温度梯度越大,随着冷却速度的增加,铸型充型时间减小,冷却速度为100 K/s时,充型时间为15.57 s,整个铸锭缩松缩孔的缺陷区域主要存在浇注系统以及冒口部分,且在3种冷却速度中冷却速度为10 K/s的铸锭缺陷区域面积最大,微观组织颗粒尺寸也随过冷度的增加而减小。

Based on the theoy of Back Diffusion and CAFE,coupled simulation of temperature field flow field and miscrostructure on the o800 mm×600 mm new iron-based ignot sand mold casting process; Analysis of the change of the temperature field flow field and temperature gradient and casting defects during solidification process ; Results show that the nearer the cold iron, the greater the temperature gradient ,With increasing cooling rate, mold filling time is reduced and the filling time of 100 K/s＇s casting is 15.57 s; and microstructure grain size decreases;the ingot casting shrinkage porosity defect area mainly exist gating system and riser.