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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。
Based on the mathematical model and numerical simulation method of alloy solidification transmission and macrosegregation prediction established by the authors, a BSTVCCAL software system was developed to simulate the temperature field, concentration field, pressure field and velocity field of liquid-like flow during the directionally solidification of the blade-like castings with double- And dendrite parameters were calculated by computer simulation. The directional solidification behavior, macro-composition and dendrite parameters of the castings under different control parameters (including V (t) at different speeds and TH (t) at heating temperature) were studied. The results confirm the application of the alloy solidification three-pass model to control the directional solidification behavior of the blade and reduce the variation of dendrite parameters and the macro-component segregation as the goal. The possibility of computer-aided optimization design of the directional solidification process of the superalloy blade is confirmed.