Measurement of Specific Heat Capacity and Electrical Resistivity of Industrial Alloys Using Sub-Second and Super-Second Pulse Heating Techniques

Published

October 16, 2008

Author(s)

D Basak, R A. Overfelt, Dongli Wang

Abstract

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.

Citation

International Journal of Thermophysics

Pub Type

Journals

Keywords

CF8M stainless steel, electrical resistivity, Inconel 718, pulse heating, specific heat capacity, Ti-6Al-4V

Citation

Basak, D. , Overfelt, R. and Wang, D. (2008), 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 April 26, 2024)