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热疲劳是材料在交变热应力作用下的失效形式。随着科学技术的发展,热疲劳及测试技术愈来愈引起人们的重视。据资料介绍,影响热疲劳性能的因素很多,除工艺、材质等方而外,试验方法是一个很重要的因素。本试验主要研究高温合金GH36在两种不同加热温度,三种不同冷却介质下的热疲劳抗力,摸索出温度、介质与热疲劳性能的关系,并通过金相、扫描电镜观测疲劳裂纹和断口,以进一步研究热疲劳裂纹扩展规律和断裂机理。这是一种模拟涡轮叶片热疲劳的测试研究。一、试验条件及方法试验用料为高温合金GH36,其化学成分见表1。
Thermal fatigue is a form of failure of the material under alternating thermal stresses. With the development of science and technology, thermal fatigue and testing technology have drawn more and more attention. According to the information, many factors affect the thermal fatigue performance, in addition to technology, materials and other aspects, the test method is a very important factor. In this experiment, we study the thermal fatigue resistance of GH36 under two different heating temperatures and three different cooling media, find out the relationship between temperature, medium and thermal fatigue properties, and observe the fatigue crack and fracture through metallographic and SEM, To further study the thermal fatigue crack propagation law and fracture mechanism. This is a simulation of turbine blade thermal fatigue test study. First, the test conditions and methods The test materials for high-temperature alloy GH36, the chemical composition shown in Table 1.