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探讨了晶粒度为ASTM3～5级的细晶铸造IN718C合金的显微组织对持久性能的影响．通过分析细晶材料的持久断口和显微组织，发现该合金与普通铸造材料不同的是：细晶材料的持久断裂主要为沿晶断裂形式，其碳化物、Laves相和δ相主要分布在晶界：细晶材料在不同铸态枝晶组织中晶界上碳化物和Laves相都有降低材料持久性能的倾向．
The effect of the microstructure of IN718C alloy with fine grain cast ASTM3 ~ 5 on the permanent property was discussed. By analyzing the long-term fracture and microstructure of the fine grained material, it is found that this alloy is different from the ordinary cast material in that the long-term fracture of the fine grained material is mainly along the intergranular fracture and its carbide, Laves phase and δ phase are mainly distributed in the crystal The world: fine grain materials in different as-cast dendrites grain boundary carbides and Laves phase have the tendency to reduce the durability of the material.