EFFECT OF HEAT TREATMENT PARAMETERS ON THE Q-FACTOR OF FE-NI SUPERALLOYS

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2022-2-3

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Tanrısevdi, Ali Emre

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Q-factor or quality factor is a dimensionless parameter that indicates loses of energy in a mechanical structure. It is a phenomenon commonly used in coils, condensers, resonant circuits, resonant devices, transmission lines and gyroscopes. High Q-factor materials are used in space, defence and aviation industry. Low energy loss during oscillation of material connotes high Q-factor. Utilization of high Q-factor materials in commercial applications necessitate easily accessible metallic materials to be used rather than quartz because of economic reasons. In this study, Ni-Span C902, 42NiCrTiAl, 42NiCrTiAl, 36NiCrTiAl superalloys are studies in order to understand the effect of heat treatment process to their Q-factor values and the relationship between Q-factor and materials’ properties. It is been seen that Q-factor of superalloys depend on not only mechanical properties but also microstructure. Grain size, annealing twins, grain boundary geometry and precipitates were observed to change the Q-factor of superalloys.

Subject Keywords

Quality Factor, Iron-Nickel Steels, Gyroscopes, Superalloys, Heat Treatment, Microstructure

URI

https://hdl.handle.net/11511/96250

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

A. E. Tanrısevdi, “EFFECT OF HEAT TREATMENT PARAMETERS ON THE Q-FACTOR OF FE-NI SUPERALLOYS,” M.S. - Master of Science, Middle East Technical University, 2022.