Abstract
This work is aimed at characterizing the irreversible changes in electrical resistivity caused by microstructure evolution in IN718 nickel‐base superalloy. Of course, the electric resistivity also exhibits a strong reversible change that is a function of the instantaneous temperature, therefore realtime assessment of microstructure evolution also requires accurate monitoring of temperature. In‐situ resistivity monitoring was conducted throughout various heating cycles using the Alternating Current Potential Drop (ACPD) technique. Using thermocouple wires for connections, measurement of the DC potential difference between the connecting electrodes without current injection allows parallel monitoring of the local temperature. It was found that this method can be readily used both to record the thermal history experienced by the material and to assess the resulting irreversible microstructural changes.
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