Measurement of Specific Heat Capacity and Electrical Resistivity of Industrial Alloys Using Sub-Second and Super-Second Pulse Heating Techniques
D Basak, R A. Overfelt, Dongli Wang
The determination of the specific heat capacity and electrical resistivity of Inconel 718, Ti-6Al-4V, and CF8M stainless steel, from room temperature to near the melting temperatures of the alloys is described. The method is based on rapid resistive self-heating of a solid cylindrical specimen by the passage of a short-duration electric current pulse through it while simultaneously measuring the pertinent experimental quantities (e.g., voltage drop, current, specimen temperature). The properties are determined from room temperature to about 1300 K using a super-second pulse heating technique by supplying a constant current from a programmable power supply and measuring the temperature using a Pt-Pt:13%Rh thermocouple welded to the surface of the specimen. The properties are determined at higher temperatures, from 1350 K to near the melting temperatures of the alloys, using a millisecond-resolution pulse heating technique by supplying the current from a set of batteries controlled by a fast-response switching system and measuring the temperature using a high-speed pyrometer in conjunction with an ellipsometer, which measures the corresponding emissivity. The present study extends the application of these techniques, previously applied to pure metals, to industrial alloys.
, Overfelt, R.
and Wang, D.
Measurement of Specific Heat Capacity and Electrical Resistivity of Industrial Alloys Using Sub-Second and Super-Second Pulse Heating Techniques, International Journal of Thermophysics
(Accessed December 8, 2023)