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研究了P含量对细晶GH761合金组织和性能的影响.结果表明:P含量在0.0007%--0.040%(质量分数)之间时,对合金的室温和650℃拉伸性能影响不大,但显著影响650 ℃/690 MPa下的持久性能和700℃/550 MPa下的蠕变性能.P含量在0.023%左右可成倍提高细晶合金的持久寿命,降低蠕变速率.细晶化和P微合金化相结合的方法可以在显著提高合金拉伸强度和塑性的同时,保持合金优良的持久和蠕变性能,从而全面优化合金的综合性能.

Effect of P content on the microstructure and mechanical properties of fine-grained GH761 alloy was studied.The results showed that no obvious effect on the tensile properties of finegrained GH761 alloy WaS observed when P content in GH761 alloy was below 0.040%(mass fraction).However,P influenced the stress rupture and creep properties greatly.The peak value of the life at 650℃and 690 Mpa appeared around 0.023%P.In comparison with that of the alloy with 0.0007%P,the life increased more than 2 times.At the same time,the creep rate of the alloy with 0.023%P is also the 10west in a11 of alloys.P iS beneficial to the mechanical properties of fine-grained GH761 alloy by improving the precipitation at grain boundaries and impeding the disclocation movement.The overall properties of GH761 alloy can be improved by grain refining and appropriate amount of P addition.

参考文献

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