为了降低Inconel 718合金的生产成本，设计了常规方案和经济方案两种试验方案：常规方案用纯金属冶炼718合金，经济方案用铌铁合金替代金属铌、用铬铁合金替代金属铬冶炼718合金。运用两种方案在真空感应炉内分别冶炼了一炉718合金并浇铸成锭，将两支铸锭按照相同的工艺参数进行扩散退火、轧制成材及热处理，随后取样进行力学性能及金相组织分析。试验结果表明，用两种方案冶炼的718合金均能满足国内优质Inconel 718合金的技术标准，且用铌铁合金替代金属铌、用铬铁合金替代金属铬冶炼的Inconel 718合金可降低18%的原料成本。
In order to decrease the production costs of Inconel 718 alloy, two kinds of test programs were designed including conventional program and economical program. The conventional program was designed to smelt Inconel 718 alloy with elemental metal. The economical program was designed to smelt Inconel 718 alloy with Nb-Fe and Cr-Fe instead of metal Nb and Cr. Two heats of 718 alloy were smelted separately by two kinds of test programs in vacuum induction furnace, molten alloy were casted to two ingots. Under the same processing parameter, two ingots were carried out diffusion annealing, roll forming and heat treatment. Specimens were taken to analyze the mechanical properties and metallurgical structure. The testing results show Inconel 718 alloy by both kinds of test programs can reach domestic technical standard of superior alloy. Compared with conventional program, economical program of using Nb-Fe and Cr-Fe instead of metal Nb and Cr can decrease 18% costs of the raw material.
参考文献
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