P含量对细晶GH761合金力学性能的影响

金属学报, 2009, 45(7): 815-819. doi: 10.3321/j.issn:0412-1961.2009.07.006

P含量对细晶GH761合金力学性能的影响

杨树林 ^1, , 孙文儒 ^2, , 王健熙 ^3, , 王克亮 ^4, , 郭守仁 ^5, , 胡壮麒 ^6,

1.中国科学院金属研究所,沈阳,110016;沈阳黎明航空发动机(集团)有限责任公司,沈阳,110043

2.中国科学院金属研究所,沈阳,110016

3.沈阳黎明航空发动机(集团)有限责任公司,沈阳,110043

4.沈阳黎明航空发动机(集团)有限责任公司,沈阳,110043

5.中国科学院金属研究所,沈阳,110016

6.中国科学院金属研究所,沈阳,110016

基金项目: 国家自然科学基金(50271072;50471083)

关键词： GH761合金 , P1细晶处理 , 力学性能

EFFECT OF P CONTENT ON MECHANICAL PROPER-TIES OF FINE-GRAINED GH761 ALLOY

Keywords： GH761 alloy , P , grain refining

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.

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