【摘要】 本文研究了(?)末镍基高温合金FGH95中PPB问题。结果指出:PPB碳化物在雾化过程中已开始形成,在热等静压过程中继续大量析出。由于PPB碳化物化学成分及组成复杂,不同类型碳化物可发生相互作用。热处理使PPB问题更加严重。通过实验证明并分析PPB碳化物的形成主要是与合金中残留氧量有关。更多还原

【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.更多还原