一、前言 铸造高温合金在航空燃气涡轮发动机上作导向叶片和涡轮叶片材料已得到了广泛的应用。对镍基铸造高温合金的大多数研究结果表明,镍基铸造高温合金机械性能的显微结构特征受着铸造工艺参数的影响。我们的研究工作证明,铸造高温合金的组织和性能对铸造、结晶条件的变化相当敏感,即使同一零件不同 I. Introduction Casting superalloy in aviation gas turbine engines for guide vanes and turbine blades have been widely used materials. Most studies on nickel base superalloy show that the microstructure characteristics of the mechanical properties of Ni-base superalloy are affected by the casting process parameters. Our research shows that the microstructure and properties of the foundry superalloys are quite sensitive to changes in the casting and crystallization conditions even when the same part is different