粉末高温合金FGH95和FGH96的热机械疲劳性能  

Thermal-Mechanical Fatigue Performance of Powder Metallurgy Superalloy FGH95 and FGH96

作　　者：张国栋[1] 何玉怀[1] 苏彬[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2011年第6期96-100,共5页Journal of Aeronautical Materials

摘　　要：对粉末高温合金FGH95和FGH96进行了温度循环为350℃到600℃的同相位和反相位热机械疲劳试验。分析比较了两种合金的热机械疲劳滞后回线、循环应力响应行为和疲劳寿命。研究结果表明:FGH95合金和FGH96合金的热机械疲劳应力-应变滞后回线拉压对称,合金表现出高强度低塑性的特点;在相同总应变范围下,FGH96合金的热机械疲劳循环塑性比FGH95合金的热机械疲劳循环塑性大;FGH95合金和FGH96合金的热机械疲劳循环应力响应行为与热机械载荷水平相关;在相同的变形条件下,FGH96合金的热机械疲劳循环应力比FGH95合金的热机械疲劳循环应力小,从而导致了FGH96的热机械疲劳性能好于FGH95的热机械疲劳性能。In-phase（IP）and Out-of-phase（OP） thermal-mechanical fatigue（TMF） behavior of powder metallurgy（PM） superalloy FGH95 and FGH96 were studied with maximum and minimum temperature of 350℃and 600℃.Stress-strain loop,cyclic stress response and fatigue life of TMF in two kinds of superalloy were analyzed.Stress-strain loop of TMF showed the characteristic of tension-compression symmetry and of low plasticity with high strength.Cyclic stress response depended on magnitude of stain.At the same strain amplitude,it is found that the TMF cyclic stress of FGH96 is lower than the TMF cyclic stress of FGH95 alloy,and the cyclic plasticity of FGH96 alloy is more better than the cyclic plasticity of FGH95 alloy.Consequently TMF performance of FGH96 alloy is better than TMF performance of FGH95 alloy.

关 键 词：FGH95合金 FGH96合金 热机械疲劳 滞后回线 

分 类 号：V223[航空宇航科学与技术—飞行器设计] V215.5