【摘要】 应用作者建立的合金凝固传输及宏观偏析预测的数学模型和数值模拟方法编制了 BSTVCCAL 软件系统,对具有双变截面的类叶片铸件定向凝固过程温度场、浓度场、液相流动压力场和速度场及枝晶参数变化进行了计算机模拟。研究了不同变工艺参数(包括不同变抽拉速度 V(t)和炉体变加热温度 TH(t))控制下的叶片铸件定向凝固行为及宏观成分和枝晶参数变化。研究结果肯定了应用合金凝固三传模型,以控制叶片定向凝固行为、减小枝晶参数变化和宏观成分偏析为目标,对高温合金叶片的定向凝固工艺进行计算机辅助优化设计的可能性。更多还原

【Abstract】 The continuum model and numerical solution method proposed by the authors were ap- plied to the directional solidification processes of blade-like castings.Numerical simulation of the tem- perature,solid fraction and solutional concentration distributions and the pressure and velocity fields of liquid phase flow in the directional solidification of blade-shaped model castings were performed.With a software system of BSTVCCAL developed by the authors,the influences of different kinds of varying technological parameters,such as varying withdrawal velocity V(t) and varying heating temperature Ttt (t),on the dendrite structure variations and macrosegregations in the modeled blade castings were stud- ied at the aim for obtaining an optimal technological design for a directional solidification process of blades.更多还原