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THEINFLUENCEOFENVIRONMENTONFATIGUEANDFRACTUREOFIRONALUMINIDESSTOLOFF,N.S.andALVEN,D.A.(DepartmentofMaterialsEngineeringRensse... 相似文献
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D. E. GORDON C. K. Unni N. S. STOLOFF 《Fatigue & Fracture of Engineering Materials & Structures》1994,17(9):1025-1032
Both high-cycle and low-cycle fatigue properties of hot-extruded powders of a Ni3Al-based alloy, IC218, have been evaluated. High cycle fatigue measurements were performed under stress controlled conditions at temperatures ranging from 25°C to 850°C. Tests were made in both laboratory air and vacuum environments. Low cycle fatigue tests were conducted under total strain control in a laboratory air environment at 650°C. In high cycle fatigue, high ratios of the fatigue limit (Δσ at 106 cycles) to monotonic yield strength (σys), of approximately Δσ/σys~1, were obtained in the powder extruded IC218 alloy for temperatures ranging from 25°C to 650°C. In low cycle fatigue, a substantial decrease in fatigue life occurred at 650°C, compared to results obtained previously at 25°C. High cycle fatigue performance at low stress/strain amplitudes is better than expected when compared to precipitation strengthened superalloys. The improved performance is explained in terms of the cyclic hardening behavior of the alloy. 相似文献
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