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中文摘要：
研究了亚固相线温度扩散退火处理对FGH96粉末高温合金原始颗粒边界（PPB）的影响，结果表明，试验用热等静压（HIP）态FGH96试样中所存在的PPB主要由富Ti和Nb的MC型碳化物以及少量的氧化物组成。试样经1230℃×8h／AC扩散退火处理后并不能完全消除PPB，但部分碳化物溶解，PPB从连续网膜转变成离散的颗粒状，显微组织中PPB明显减轻。试样经HIP＋1150℃×30min／WC处理后在PPB较严重的区域出现裂纹，主要沿PPB扩展；退火态试样经1230℃×30min／WC处理后裂纹相对较细，其主要沿晶界扩展。
英文摘要：
The effect of sub-solidus diffusion annealing on prior particle boundary（PPB） precipitation of hot isostatically pressed superalloy FGH96 is studied. The results of present study indicate that the continuous PPB precipitation in the sample of as-HIPed alloy FGH96 is constituted of MC carbides enriched with Ti and Nb as well as some oxides. Although PPBs cannot be completely eliminated when the alloy is treated at 1230℃ for 8h/AC, large numbers of carbides at PPBs can be dissolved into matrix, and the precipitates became discrete particles rather than continuous. Serious cracks in the sample treated as per the schedule of HIP＋ 1150℃ × 30min/WC are due to the PPB carbides and propagate along PPBs, while the slight cracks in the sample treated as per HIP＋ 1230℃ × 8h/AC＋ 1230 × 30min/WC propagate along grain boundaries.
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