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利用薄壁管试样,在MTS809疲劳试验机上对GH4169镍基高温合金进行了650oC下的高温多轴拉扭低周疲劳试验,通过对应力应变迟滞迴线分析发现,拉扭分量应力应变迟滞迴线形状与试件的加载波形和加载路径相关,塑性应变不断增大。利用FEI-Quanta 200扫描电镜和EDAX Genesis 2000 X-射线能谱仪对试样疲劳断口微观分析,结果表明,GH4169镍基高温合金材料在高温循环加载下有氧化现象。综合不同等效应变下材料的断口形貌差异,推断在高温循环加载下有蠕变氧化作用。
The low temperature fatigue test of GH4169 nickel base superalloy was carried out on the MTS809 fatigue testing machine at 650oC under high temperature by using the thin-walled tube sample. Through the analysis of stress-strain hysteresis loop, it was found that the stress-strain hysteresis The shape of the wire is related to the loading waveform of the test piece and the loading path, and the plastic strain is continuously increasing. The fatigue fracture microstructure of the sample was analyzed by FEI-Quanta 200 scanning electron microscope and EDAX Genesis 2000 X-ray energy dispersive spectrometer. The results show that the GH4169 nickel base superalloy has oxidation under cyclic loading. According to the fracture surface morphologies of the materials under different equivalent strains, it is inferred that there is creep oxidation under cyclic loading under high temperature.