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对第三代镍基高温合金中γ/γ′和γ/Laves金属间化合物随合金中Ti、Al、Nb含量的变化的定量关系进行研究。结果表明,当合金(3GSA-HNM-1合金)含9.8%(质量分数)(Ti+Al)时,其生成的共晶化合物含量最高可达41.5%,这种高含量的共晶化合物会导致合金的铸造能力降低。对3GSA-HNM-2合金(含γ-7.6%(Ti+Al)和1.5%Nb),随(Ti+Al)含量的降低,生成的共晶化合物种类和形貌均发生了变化,数量也显著减少,可预计其铸造能力会得到改善。对3GSA-HNM-3合金(含γ-5.7%(Ti+Al)),随着Nb含量的增加,生成的Laves相数量减少,虽然程度有所降低。因此,对含2.9%Nb的3GSA-HNM-3合金(γ-5.7%(Ti+Al)),由于生成的共晶化合物数量最少(4.7%),其可铸造能力最好。
The quantitative relationship between γ / γ ’and γ / Laves intermetallics with the contents of Ti, Al and Nb in the third generation Ni-based superalloy was studied. The results show that the content of eutectic compound is up to 41.5% when the alloy (3GSA-HNM-1) contains 9.8% (Ti + Al) The casting ability of the alloy is reduced. For the 3GSA-HNM-2 alloy (containing γ-7.6% (Ti + Al) and 1.5% Nb), the species and morphology of eutectic compounds changed with the decrease of (Ti + Al) Significantly reduced, the casting capacity can be expected to be improved. For the 3GSA-HNM-3 alloy (containing γ-5.7% (Ti + Al)), the amount of Laves phase is reduced, albeit to a lesser extent, as the Nb content increases. Therefore, for 3GSA-HNM-3 alloy (γ-5.7% (Ti + Al)) containing 2.9% Nb, the castability was the best because of the least amount of eutectic compound formed (4.7%).