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研究了微量元素 Ｐ对一种 Ｎｉ基铸造高温合金组织和 ９５０℃不同应力条件下持久性能的影响结果表明，随着 Ｐ含 量的升高，合金的持久寿命和持久延伸率不断提高，当 Ｐ含量（质量分数，下同）为 ０．０１７％时持久寿命达到峰值； Ｐ含量超过 ０．０１７％时合金在（γ＋γ’）共晶前沿析出磷化物相． Ｐ对合金持久性能的有益作用是由于 Ｐ偏聚到枝晶间和晶界，抑制晶界扩 散，从而提高合金的晶界强度．
The effect of trace element P on the permanent properties of a Ni-base superalloy and under different stress at 950 ℃ was studied. The results show that the long-term life and elongation of the alloy increase with the increase of P content. When the content of P (Mass fraction, the same below) is 0.017%, the life expectancy reaches the peak value. When the P content exceeds 0.017%, the alloy precipitates the phosphide phase at the (γ + γ ’) eutectic frontier. The beneficial effect of P on the ductility of the alloy is due to the segregation of P into the interdendritic and grain boundaries, inhibiting the grain boundary diffusion and increasing the grain boundary strength of the alloy.