直接时效对GH4169合金应力集中敏感性的影响  

Effect of Direct Aging on Stress Concentration Sensitivity of GH4169 Superalloy

作　　者：谢孝昌[1] 李旭东[1] 汤春峰[1] 付书红[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《材料工程》2016年第2期88-93,共6页Journal of Materials Engineering

摘　　要：以直接时效态(DA)GH4169合金为研究对象,通过旋转弯曲疲劳实验,分别研究该合金在650℃和室温大气状态下,应力集中系数分别为K_t=1,K_t=3,K_t=4时的疲劳极限。结果表明,直接时效态GH4169合金在高温650℃和室温状态下,均具有很强的应力集中敏感性,650℃时的疲劳极限,K_t=4较K_t=1下降了68%;室温时的疲劳极限,K_t=4较K_t=1下降了66%。同时,直接时效态GH4169合金在室温条件下,疲劳极限较650℃显著降低,室温较650℃时的疲劳极限在K_t=1时下降了32%,K_t=3时下降了30%,K_t=4时下降了28%。Through rotating bending fatigue test carried out in air condition, the fatigue limit of DAGH4169 superalloy with three different stress concentration sensitivity coefficients （K1= 1, Kt=3 and Kt=4） at room temperature and at 650℃was studied. The research results indicate that the DAGH4169 superalloy is severely sensitive to the stress concentration both at room temperature and at 650℃. When it is at 650℃, the fatigue limit of DAGH4169 superalloy with stress concentration sensitivity coefficient K, =4 decreases by 68% compared with K, = 1, and the fatigue limit decreases by 66% at room temperature. Meanwhile, the fatigue limit of the DAGH4169 superalloy is obviously lower at room temperature than at 650℃. When K, = 1, the fatigue limit at room temperature decreases by 32% compared with at 650℃ , and the fatigue limit decreases by 30% when K, =3,and the fa tigue limit decreases by 28G, when K1=4.

关 键 词：直接时效 GH4169 旋转弯曲疲劳 应力集中敏感 疲劳极限 

分 类 号：TG113.25[金属学及工艺—物理冶金]