Abstract
Non-destructive measurement of residual stress at the subsurface of nickel-based alloys using eddy current method has been limited by its sensitivity to its microstructure, especially to the precipitates. This paper investigates the effect of heat treatment on the electrical conductivity of RR1000, a nickel-based superalloy with a large fraction of γ’ precipitates. Different heat treatment conditions, ranging from solution heat treatment to precipitation hardening with different aging times and temperatures, are used to achieve varying initial microstructures. Hardness of the samples is measured first to quantify the heat treated samples followed by the measurement of electrical conductivity using the conductivity probes of frequencies between 1 MHz and 5 MHz. The relationship between the hardness and conductivity of the heat treated samples is then correlated further. The results highlight the significant influence of heat treatment on the sample hardness and the electrical conductivity of RR1000.
Highlights
Nickel-based alloys possess excellent corrosion resistance and mechanical strength, establishing them as ideal candidates for high temperature aerospace applications [1]
This paper studies the effect of thermal aging on electrical conductivity of RR1000 through conducting different heat treatments
This paper investigated the effect of thermal aging on the electrical conductivity of RR1000
Summary
Nickel-based alloys possess excellent corrosion resistance and mechanical strength, establishing them as ideal candidates for high temperature aerospace applications [1]. Non-destructive measurement of residual stresses after treatment or in-service components has been a challenge. Eddy current spectroscopy [3] is a suitable non-destructive method to measure residual stresses in nickel-based alloys presently. This method uses piezoresistivity effect, a relationship between the elastic stresses and the eddy current conductivity, to measure residual stresses in the material. Though this method is capable of detecting even minor changes in material conductivity induced by the residual stresses, it shows limitations through its sensitivity to microstructural features
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