Thermodynamic calculation of equilibrium phases for P/M superalloys
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摘要: 利用熱力學平衡相計算方法及相應的高溫合金數據庫對René95,René88DT和an741нп三種合金在平衡相析出溫度范圍和析出量以及之間的關聯性進行了系統的熱力學計算對比分析.結果表明:三種粉末高溫合金的平衡相種類基本相同,主要平衡相為γ,γ'和碳化物M23C6,MC,M6C.René95合金中的碳化物含量要高于其他兩種合金.зп741нп有著較高的γ'相析出溫度和較大的析出量.隨溫度降低,Co和Nb從γ'相中析出,在其周圍富集,其中зп741нп合金中尤為明顯.合金元素的偏聚度也和合金的初熔點與終熔點之差的大小有關,其熔解區間越大即初熔點和終熔點之差越大,合金元素的偏聚度越大.Abstract: The precipitation temperature range and quantity in equilibrium phases of three P/M superalloys, René95, René88DT and зп741нп, were systematically calculated by using a thermodynamic calculation method and the relevant superalloy database. The calculated results show that the three alloys have the same major phases, such as γ,γ' and MC, M6C, M23C6 carbides. The quantity of carbides in René95 is more than the others. The γ' precipitation temperature of зп741нп is higher and the γ' amount is more than that of René95 or René88DT. The liquid segregation behaviors of the three alloys were compared and discussed.
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Key words:
- P/M superalloy /
- thennodynamic calculation /
- equilibrium phase /
- precipitation /
- segregation
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