The Study of Previous Powder-Particle Boundary Carbides
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摘要: 本文研究了粉末鎳基高溫合金FGH95中PPB問題。結果指出:PPB碳化物在霧化過程中已開始形成,在熱等靜壓過程中繼續大量析出。由于PPB碳化物化學成分及組成復雜,不同類型碳化物可發生相互作用。熱處理使PPB問題更加嚴重。通過實驗證明并分析PPB碳化物的形成主要是與合金中殘留氧量有關。Abstract: The problem of previour powder-particle boundary (PPB) was studied in a nickel-base P/M superalloy FGH95. The results indicate that carbides begin to form on the powder surface while atomization and continue to precipitate and grow into continous networks during HIP-consolidation. As a result of complex composition of carbides the different type carbides interact probably. The amount of PPB precipitation increases significantly during post-HIP heat treatment. The formation of PPB carbides is related to the amount of residual oxygen or oxygen contamination in alloy.
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