雾化喷射沉积成形中沉积体内的凝固过程(Ⅱ)──Al-Cu合金的计算

Analysis of Solidification Behavior in Spray Deposited Preform (Ⅱ)──Calculation Results for Al-Cu Alloy

根据已知的喷射沉积成形沉积体内的凝固模型，对典型的Al-Cu合金进行了计算分析．结果表明，工艺参数（如沉积速率和沉积时雾化锥的温度）和材料的热物性（如界面换热系数）对沉积体内的凝固过程有明显影响．在沉积热力学条件（沉积前雾化锥的热力学状态）相同的情况下，沉积表面的温度随工艺参数和材料热物性发生显著变化．

According to the solidification model in the spray formed preform, thesolidification behavior of typical Al-Cu alloy is calculated and discussed. The resultshows that processing parameters such as deposition rate and spray temperature at deposi-tion, and material thermal physical properties such as surface heat transfer coefficienthave apparent effects on solidification process in preform. Under the same deposition ther-modynamic state just before the spray cone depositing on the surface of the preform,temperature of deposition surface varys significantly as the processing parameters and mate-rial thermal physical properties change.