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为消除粉末冶金高温合金FGH4097中存在的原始颗粒边界(PPB),采用Thermo-Calc热力学计算软件对FGH4097合金系进行热力学计算,并进行相应的组织观察与能谱分析,重点研究了铪(Hf)在FGH4097合金中的分布规律以及Hf对析出相的影响,特别是分析了Hf对合金中PPB的影响规律。结果表明,FGH4097合金中Hf主要存在于MC、MB2和γ’相中,Hf能促进MC相和γ’相的析出,有效地抑制M6C和M23C6型碳化物的形成。Hf质量分数为0.30%时消除了FGH4097合金中的PPB。
In order to eliminate the original particle boundary (PPB) existing in the powder metallurgy superalloy FGH4097, the thermodynamic calculation of FGH4097 alloy was carried out by Thermo-Calc thermodynamic calculation software, and the corresponding microstructure and energy spectrum analysis were conducted. The effects of hafnium (Hf) The distribution of Hf in the alloy FGH4097 and the influence of Hf on the precipitated phase. In particular, the influence of Hf on the PPB in the alloy was analyzed. The results show that Hf mainly exists in MC, MB2 and γ ’phases in FGH4097 alloy. Hf can promote the precipitation of MC phase and γ’ phase and effectively inhibit the formation of M6C and M23C6 carbides. The Hf mass fraction of 0.30% eliminates the PPB in the FGH4097 alloy.