磷阻碍氧沿晶侵入改善GH761合金持久性能的作用  

Effect of Phosphorus on Blocking the Diffusion of Oxygen to Extend the Stress Rupture Life of GH761 Alloy

作　　者：杨树林[1] 孙文儒[2] 王健熙[3] 冯贞伟[3] 

机构地区：[1]东北大学,沈阳110004 [2]中国科学院金属研究所,沈阳110016 [3]中国人民解放军驻沈阳黎明发动机制造公司军事代表室,沈阳110043

出　　处：《航空发动机》2006年第1期53-55,共3页Aeroengine

基　　金：国家自然科学基金(50271072;50471083)

摘　　要：在GH761合金中添加0.023%的磷,使合金在650℃,637 MPa条件下的持久寿命明显延长。采用金相显微镜、扫描电镜及能谱分析等手段,分析了磷阻碍氧沿晶侵入改善持久性能的机理,结果是:持久试样的沿晶开裂是由氧化引起的,晶界氧化物中磷含量极低;磷在晶界上偏聚,可以阻碍环境氧的沿晶扩散,抑制表面裂纹的萌生和扩展,从而提高了合金的持久寿命。The stress rupture life of GH761 alloy at 650℃ and 637MPa is extended considerably with the addition of 0.023% P. Metallographic microscope and scanning electron microscope （SEM） in combination with energy dispersive spectrum （ EDS） are used to analyze the effect of phosphorus on blocking the diffusion of oxygen along grain boundaries. Results show that the intergranular crack is caused by oxidation, and the content of phosphorus in oxide is very small. Phosphorus tends to segregate at grain boundaries, and can therefore block the diffusion of oxygen along grain boundaries and restrain the formation and extension of intergranular crack , which is beneficial to increase the stress rupture life of GH761 alloy.

关 键 词：GH761合金 持久性能 磷 氧化 

分 类 号：V252[一般工业技术—材料科学与工程] TG132.32[航空宇航科学与技术—航空宇航制造工程]