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Effects of service environment and pre‑deformation on the fatigue behaviour of 2524 aluminium alloy

Chen Y. Q., Zhang H., Pan S. P., Song Y. F., Liu X., Liu W. H.

Archives of Civil and Mechanical Engineering

2020

Vol. 20, no. 1

56--71

The effects of service environment and pre-deformation on the fatigue behaviour of 2524 alloy were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and fatigue tests. The results indicate that the fatigue crack-growth rate (FCGR) of the alloy in an aqueous environment increases with temperature ranging from 0 to 90 °C. At the same stress intensity factor range (ΔK), the FCGR of the alloy in an argon environment is the smallest, followed by that in air, and a 3.5% NaCl fog environment, while that in an exfoliation corrosion (EXCO) solution is the largest. A pre-deformation of 2% can significantly enhance the fatigue crack propagation resistance of this alloy in argon, air, and 3.5% NaCl fog environments, while 5% pre-deformation weakens the fatigue crack propagation resistance of the alloy accordingly. The pre-deformation effect on the FCGR of alloy in the EXCO solution environment is limited.

Damage development of Inconel 718 due to laboratory simulated creep

Makowska K., Brodecki A., Mackiewicz S., Kowalewski Z. L.

Journal of Theoretical and Applied Mechanics

2018

Vol. 56 nr 3

893—896

The paper presents an attempt of application of the acoustic birefringence coefficient for early stage degradation assessment of Inconel 718 nickel superalloy after short-term creep. It is shown that it can serve as a good damage sensitive parameter and, moreover, it can be well correlated with hardness variation.