Hf在FGH4097粉末高溫合金中的相間分配行為

Hf在FGH4097粉末高溫合金中的相間分配行為Partition behavior of Hf among phases innickel-based powder metallurgy superalloy FGH4097

采用3DAP、FEG-SEM、TEM以及物理化學(xué)相分析方法研究5種Hf含量的FGH4097粉末高溫合金中 Hf在γ′相、MC型碳化物和γ相中的分配，以及Hf對(duì)γ′和MC析出相組成的影響。結(jié)果表明：隨著合金中Hf含量的增加，進(jìn)入各相的Hf量增多，Hf進(jìn)入γ′相的比例基本不變，進(jìn)入MC型碳化物的比例增大，進(jìn)入γ相的比例減小，即Hf在γ′相和MC型碳化物的分配比逐漸減小，Hf在γ′相和γ相中的分配比逐漸增大；Hf主要分配在γ′相中，其次分配在MC型碳化物中，Hf在MC型碳化物中的質(zhì)量濃度大約是Hf在γ′相中的20倍。

The partition behavior of hafnium (Hf) among different phases in FGH4097 powder metallurgy (PM) superalloy with different Hf additions and its effects on the precipitation behavior of γ′ phase, MC carbide and γ phase were studied by means of 3DAP, FEG-SEM, TEM and physiochemical phase analysis. The results show, that with increasing Hf addition, the contents of Hf in different phases increase, the mass fraction of Hf in γ′ phase almost keeps unchanged, the mass fraction of Hf in MC carbide increases and that in γ matrix decreases, which means that the partition ratio of Hf between γ′ phase and MC carbide decreases while the ratio between γ′ phase and γ matrix increases. Mass content of Hf partitioned to γ′ phase is much more than that partitioned to MC carbide, while the mass concentration of Hf in carbide is as much as 20 times of that in γ′ phase.

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