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控制铸件的晶体和冷却速率对合金的宏、微观组织、最终力学性能有很大影响.根据期望,冷却金属可很慢或很快.为生产一种单晶体,在模具中以10~(-3)～10~(-1)度/秒的冷却速率作定向结晶,最终的铸件形成一个近似网状的涡轮叶片.相反,以10~6度/秒的冷却速率快速结晶,则形成粉末或带状物.这些材料具有很细小的颗粒,而且合金元素和强化相的分布相当均匀.
Controlling the crystal and cooling rate of the castings has a great effect on the macro, microstructure and ultimate mechanical properties of the alloy.It is expected that the cooling of the metal can be very slow or fast.For the production of a single crystal, ) ~ 10 ~ (-1) degrees / sec for directional crystallization, the resulting castings form an approximately mesh-shaped turbine blade.Conversely, rapid crystallization at a cooling rate of 10 to 6 degrees Celsius results in the formation of a powder or ribbon These materials have very small particles, and the distribution of alloying elements and reinforcing phases is fairly uniform.