一、高温疲劳问题的重要性疲劳是使机械失效的一般机理。高温疲劳则是使热机械失效的特殊机理。这种失效在燃气涡轮发动机中尤为严重。一般地说,空中使用比地面使用严重,军用比民用严重。发动机的一些主要另件-压气机盘和叶片、燃烧室、涡轮导向叶片、工作叶片和涡轮盘、轴承等的寿命很大程度上受高温疲劳限制,其中涡轮部件又是整个发动机寿命的最危险部分。原因是 First, the importance of high temperature fatigue problems Fatigue is the general mechanism of mechanical failure. High-temperature fatigue is a special mechanism that causes thermal mechanical failure. This failure is particularly serious in gas turbine engines. In general, the use of the air is more serious than the ground and the military is more serious than the civilian population. The lifetimes of some of the major components of the engine, compressor discs and blades, combustion chambers, turbine guide vanes, working blades and turbine disks, bearings and the like, are largely limited by high temperature fatigue, which in turn is the most dangerous of the entire engine life section. Because