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鉿對FGH97合金平衡相影響的評估

Estimation of the effect of hafnium on equilibrium phases in FGH97 PM superalloy

  • 摘要: 利用材料相圖計算和材料性能模擬軟件JMatPro,計算了粉末高溫合金FGH97熱力學平衡相及相組成,研究了不同Hf含量對平衡相和相組成的影響,并結合物理化學相分析實驗和顯微組織觀察進行了驗證分析,進而揭示FGH97合金在750℃下各相析出和Hf在相間分配的規律,認清Hf在FGH97合金的作用.結果表明:FGH97合金在750℃下的平衡相包括γ、γ'、MC、M23C6、M3B2和μ相,Hf主要存在于γ'和MC相中,并且隨著Hf含量的增大,Hf在γ'和MC相中分配不同.

     

    Abstract: The stable phases and composition of FGH97 powder metallurgy(P/M) superalloy with different contents of hafnium were calculated by JMatPro software.The effects of hafnium content on the equilibrium phases and composition were studied.Meanwhile,the stable phases were analyzed and checked by physical and chemical phase analyses and microstructure observations.Then,the behaviors of phase precipitation and the character of hafnium partition in different phases were revealed and the effects of hafnium on FGH97 P/M superalloy were summarized.It is shown that the stable phases at 750℃ include γ matrix,γ' phase,MC carbide,M23C6 carbide,M3B2 boride,and μ phase.Hafnium mainly exists in γ' phase and MC carbide,and increasing the hafnium content causes the different distribution of hafnium between γ' phase and MC carbide.

     

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