Damage Mechanism of GH4169 Alloy under Creep-Fatigue Interaction
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摘要: 利用扫描电子显微镜对不同蠕变-疲劳试验条件（应变比分别为-1，0，-∞；总应变范围分别为1.2%，1.6%，2.0%；拉应变保持时间分别为60，120，300，1 800，5 400 s）下GH4169合金试样断口及其纵切薄片上的裂纹、孔洞等损伤特征进行分析，研究了微观损伤特征与试验条件之间的联系；利用电子背散射衍射技术定性描述了孔洞和裂纹的萌生位置与发展过程，定位了蠕变损伤，分析了蠕变-疲劳交互作用下合金的损伤机理。结果表明：总应变范围、拉应变保持时间与试样寿命成反比，与裂纹源数量以及纵切薄片上裂纹、孔洞的数量与尺寸均成正比关系；而应变比对试样寿命无明显影响；试样的蠕变损伤累积随拉应变保持时长的延长呈增长趋势。Abstract: Damage characteristics such as cracks and pores on fracture and longitudinal slice of GH4169 alloy specimens were analyzed by scanning electron microscopy, after being tested under different creep-fatigue conditions (strain ratios of -1, 0, -∞; total strain ranges of 1.2%, 1.6%, 2.0%;tensile strain retention times of 60, 120, 300, 1 800, 5 400 s). The relationship between microscopic damage characteristics and experimental condition was explored. By electron backscatter diffraction technique, the initiation position and development process of the pores and cracks were qualitatively described, the creep damage was located and the damage mechanism of the alloy under the interaction of creep and fatigue was analyzed. The results show that the total strain range and the tensile strain retention time were inversely proportional to the specimen life, and were proportional to the crack source number and the number and size of cracks and pores on the longitudinal slice. The strain ratio had no significant effect on the specimen life. The creep damage accumulation of the specimen increased with the tensile strain retention time.
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