主要研究了 K417高温合金在不同实验条件下的热机械疲劳 (TMF)行为。在计算机辅助控制伺服液压疲劳实验机上进行了同相和反相热机械疲劳实验。实验结果表明 ,与等温低周疲劳性能相比较 ,无论是同相还是反相的热机械疲劳均使寿命大大降低 ,不同相位对 TMF性能产生不同的影响。此外 ,对于热机械疲劳过程中的塑性应变分量中的时间相关相 (蠕变 )和非时间相关相 (纯塑性变形 )应当分别进行考虑 ,这样才能对该合金的热机械疲劳行为有更加准确的认识。最后用 SEM对不同试验条件下的断口进行了详细观察 ,并对其微观断裂机制进行了分析和探讨 Mainly studied the thermal mechanical fatigue (TMF) behavior of K417 superalloy under different experimental conditions. The experiments of in-phase and anti-phase thermo-mechanical fatigue were carried out on the computer aided control servo hydraulic fatigue testing machine. The experimental results show that, compared with the isothermal low cycle fatigue performance, the thermal mechanical fatigue in both in-phase and in-phase decreases the life expectancy greatly, and the different phases have different effects on the TMF performance. In addition, the time-dependent phase (creep) and non-time-dependent phase (pure plastic deformation) in the plastic strain component during thermo-mechanical fatigue should be separately considered so that the thermomechanical fatigue behavior of the alloy is more accurately understanding. Finally, the fracture under different test conditions was observed in detail by SEM, and the microscopic fracture mechanism was analyzed and discussed