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研究了返回料添加比例对铸造钻基高温合金Ｋ６４０Ｓ组织和性能的影响，结果表明，随返回料添加比例的增加，合金中的氮含量明显增加，导致枝晶组织粗大、疏松倾向明显，引起力学性能的变化当返回料添加比例大于６０％时，返回合金的高温拉伸强度降低，其中Ｍ２３Ｃ６型碳化物和基体的界面是拉伸破坏的起源地，研究发现，氮含量增加导致显微疏松增多，使高温蠕变第三阶段应变速率加快，导致Ｋ６４０Ｓ返回合金的持久强度和蠕变强度明显低于新料合金．建议在实际生产中的最大返回料使用比例为 ６０％．
The effect of the proportion of recycled materials on the microstructure and properties of the foundry-based superalloy K640S was studied. The results showed that the nitrogen content in the alloy increased obviously with the increase of the proportion of the recycled materials, which led to the coarse dendritic structure and obvious looseness. Performance changes When the proportion of the feedstock is greater than 60%, the high temperature tensile strength of the alloy is reduced. The interface between the M23C6 type carbide and the matrix is the origin of tensile failure. It is found that the increase of nitrogen content leads to the increase of microscopic looseness , So that the third stage of high temperature creep strain rate to accelerate, resulting in K640S return to the alloy of lasting strength and creep strength was significantly lower than the new alloy. Proposed in the actual production of the largest return material to use the ratio of 60%.