The formation and properties of precipitates in wrought Ni-based superalloys with different W contents during long-term exposure to high temperatures were investigated. The scanning electron microscope, transmission electron microscope, and chemical phase analysis were used to investigate the formation and properties of precipitates. It is found that with increasing W content, the quantity and thermal stability of MC carbide in Ni-based superalloys increased, while the quantity of M₂₃C₆ carbides decreased. As the results show, W has a higher partition coefficient in γ′- and γ-matrix, and the addition of W promotes the precipitation of γ′ phase. W content has no significant effect on the morphology, size, crystal structure, and coarsening rate of γ′ precipitates. The influence of W content on high-temperature tensile and creep properties of the alloys was investigated. The results showed that W content has no obvious influence on the high-temperature yield strength, but the elongation and area reduction decreased significantly when the addition of W was more than 4 wt.%. Because of the similar volume fractions of γ′ phase, the creep fracture strengths in the tested alloys with lower W concentrations were not significantly different after long-term exposure at 700 °C.

研究了长期暴露于高温下不同W含量的锻造镍基高温合金中析出物的形成和性质。使用扫描电子显微镜，透射电子显微镜和化学相分析来研究沉淀物的形成和性质。发现随着W含量的增加，Ni基高温合金中MC碳化物的数量和热稳定性增加，而M ₂₃ C ₆的数量增加。碳化物减少。结果表明，W在γ′-和γ-矩阵中具有较高的分配系数，并且W的添加促进了γ′相的析出。W含量对γ'析出物的形态，大小，晶体结构和粗化速率没有显着影响。研究了钨含量对合金高温拉伸和蠕变性能的影响。结果表明，W含量对高温屈服强度没有明显影响，但当W含量大于4wt。％时，伸长率和断面收缩率明显降低。由于γ'相的体积分数相似，因此在700 W下长期暴露后，具有较低W浓度的被测合金的蠕变断裂强度没有显着差异。