Abstract
The work concerns the research on patterns of the electron work function (EWF) distribution over the sample surface, depending on the fatigue tests. When studying samples made of high-temperature alloy EP866 used for highly loaded parts of gas turbine engine (GTE) compressors, we determined a stage of reversible structural rearrangements when the EWF value for a given surface point decreases and increases periodically fluctuating around a particular average amount. At the initial stages of testing, the EWF oscillates near a specific value, which indicates the reversibility of the process of accumulation of fatigue damage and the change in the hardening processes – relaxation at these stages. Then a stage of irreversible structural changes in the material of the surface layer is observed when the EWF decreases monotonously until the sample is destructed. It was found that in the process of cyclic deformation, the material areas experiencing the same mechanical stresses correspond to the surface areas with the similar EWF values. The deformation processes preparing the formation of a fatigue crack to cause the creation of a “deformation” dip on all the EWF distribution curves, and, accordingly, the contact potential difference (CPD). It can be assumed that the maximum change in EWF in the dip corresponds to the most intensive flow of deformation processes. The EWF distribution over the sample surface makes it possible to predict the place of fatigue cracks initiation at the early testing stages.
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Loskutov, S., Pavlenko, D., Stepanov, D., Honchar, N., Khavkina, O. (2020). Research on the Energy State of the Surface of Alloys for Gas-Turbine Engine Blades. In: Ivanov, V., Pavlenko, I., Liaposhchenko, O., Machado, J., Edl, M. (eds) Advances in Design, Simulation and Manufacturing III. DSMIE 2020. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-50491-5_15
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DOI: https://doi.org/10.1007/978-3-030-50491-5_15
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