A wrought Ni-base superalloy, Waspaloy, with four nominal levels of P additions (0, 0.01, 0.02, and 0.04 wt pct) was studied in order to better understand how P influences the grain boundary microstructures as well as creep resistance. Results from this investigation revealed that P additions promoted the precipitation of M₂₃C₆ carbides at grain boundaries. The effect of P additions on the creep properties was assessed by both creep rupture and interrupted creep tests at 816 °C/180 MPa and 650 °C/760 MPa. Changes in the fraction and morphology of the M₂₃C₆ carbides at grain boundaries due to P additions were found to result in a notable reduction of the creep ductility when tested at 650 °C/760 MPa where the creep strain was localized along the grain boundaries. However, the additions of P and associated changes in the M₂₃C₆ carbides did not affect the creep behavior of samples tested at 816 °C/180 MPa where the creep strain was largely transgranular. This study reveals that P affects the creep resistance of the polycrystalline Ni-base superalloys by accelerating the nucleation and growth kinetics of M₂₃C₆ along the grain boundaries.

为了更好地了解 P 如何影响晶界微观结构以及抗蠕变性，研究了一种具有四种标称 P 添加量（0、0.01、0.02 和 0.04 wt pct）的锻造镍基高温合金 Waspaloy。该研究的结果表明，P 的添加促进了 M ₂₃ C ₆碳化物在晶界处的析出。通过在 816 °C/180 MPa 和 650 °C/760 MPa 下的蠕变断裂和间断蠕变试验来评估 P 添加对蠕变性能的影响。M ₂₃ C ₆的分数和形态的变化当在 650 °C/760 MPa 下测试时，由于 P 添加导致晶界处的碳化物导致蠕变延展性显着降低，其中蠕变应变沿晶界局部化。然而，在 M ₂₃ C ₆碳化物中添加 P 和相关变化不会影响在 816 °C/180 MPa 下测试的样品的蠕变行为，其中蠕变应变主要是穿晶的。该研究表明，P 通过加速 M ₂₃ C ₆沿晶界的成核和生长动力学来影响多晶 Ni 基高温合金的抗蠕变性。