本文研究了粉末镍基高温合金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.PPB碳化物的形成主要是和合金中残留氧量有关.
The previous powder-particle boundary (PPB) problem has been studied in P/M superalloy FGH95. The results indicate that the PPB carbides begin to form on the powder surface during atomization and continuously precipitate during HIP-consolidation. As a result of complex composition of carbides the different types carbides interact probably. The amount of PPB precipitation increased significantly during post-HIP heat treatment. The formation of PPB carbides is related to the amount of residual oxygen in alloy.
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