众所周知,铸造工艺和凝固条件会影响高温合金的组织和性能。尤其是高合金化的铸造镍基合金,从零件(如涡轮叶片)上切取试样与成型试样相比,在性能上会出现很大差别。无论是强度或延性,均可能大幅度地降低,特别是中温性能(760℃左右)更为明显。零件性能和成型试样性能的差别会影响合金在发动机上的使用。有时,设计过程中认为强度足够的合金会在发动机的运行过程中出现意外的断裂。因此近年来。国外和国内的材料研 As we all know, the casting process and solidification conditions will affect the microstructure and properties of superalloys. In particular, the highly alloyed cast nickel-base alloys, when cut from a part such as a turbine blade, have significant differences in performance as compared with a formed sample. Either strength or ductility, may be significantly reduced, especially in the temperature performance (760 ℃ or so) is more obvious. The difference between the performance of the part and the performance of the formed specimen will affect the alloy’s use on the engine. Sometimes, alloys that are considered strong enough during the design process will unexpectedly break during engine operation. So in recent years. Research abroad and domestic materials