Hf和Re含量对Co-Ti-V高温合金γ/γ′两相晶格错配度的影响

通过对不同含量Hf和Re的Co-Ti-V高温合金进行组织形貌观察和X射线衍射分析,研究不同含量Hf和Re合金中γ′相形貌与γ/γ′两相晶格错配度的关系。采用EDS分析合金中各元素的分配行为与γ/γ′两相晶格错配度的关系。通过对不同成分的合金进行1000℃高温压缩实验,研究Hf和Re含量对合金高温压缩性能的影响。结果表明:随着Hf含量的增加,γ′相的形貌由立方形转变为球形,γ/γ′两相的晶格错配度减小;随着Re含量的增加,γ′相的形貌由立方形变为长条状,且γ′相变得粗大,γ/γ′两相的晶格错配度减小;通过EDS分析,Co、Hf和Re元素在γ相中富集,而Ti和V元素在γ′相中富集;随着Re含量增加,合金的屈服强度和抗拉强度均增加;随着Hf含量的增加,合金的屈服强度和抗拉强度先减小后增大。

Role of Hf and Re on the lattice misfit between γ/γ of Co-Ti-V superalloys

The relationship betweenγ′phase morphology andγ/γ′lattice misfit degree in Co-Ti-V superalloy with different Hf and Re contents was studied by observation of microstructure and X-ray diffraction analysis.The EDS is used to analyze the relationship between the distribution behavior of each element and lattice misfit betweenγ/γ′of Co-based superalloys.The effect of Hf and Re content on the high temperature compression properties of Co-based superalloys was studied by 1000℃high temperature compression test.The results show that the morphology ofγ′phase shifts from square to spherical,and the lattice misfit betweenγ/γ′phase decreases with the increment of Hf content.The morphology ofγ′phase changes from square to long strip,theγ′phase turns coarse,and the lattice misfit betweenγ/γ′phase decreases with the increment of Re content.According to the EDS analysis,Co,Hf and Re are enriched in theγphase,while the Ti and V are enriched in theγ′phase.With the increase of Re content,the yield strength and ultimate strength of the alloy are increased.The yield strength and ultimate strength of the alloy are decreased firstly and then increased with the increase of Hf content.