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一、引言 GH302合金是以Fe-Ni-Cr为基的高温合金,具有低Ni的优点,较符合于我国的资源条件。从性能水平来看,可用作800～850℃燃气轮机的叶片。在试验过程中曾发现该合金的高温疲劳性能不太稳定,为此作了重点研究。 通过几年来的工作,主要对GH302合金的高温疲劳性能的影响因素进行了一些研究,初步探讨了影响该合金的高温疲劳性能的某些因素。通过实践发现,试样的表面质
I. Introduction GH302 alloy is based on Fe-Ni-Cr superalloy, with the advantages of low Ni, more in line with China’s resource conditions. From the performance point of view, can be used as 800 ~ 850 ℃ gas turbine blades. In the course of the experiment, it was found that the high-temperature fatigue properties of the alloy are not very stable, for which focus has been made. After several years of work, the main influencing factors on the high temperature fatigue properties of GH302 alloy have been studied. Some factors affecting the high temperature fatigue properties of the alloy have been preliminarily discussed. Found through practice, the surface quality of the sample