Thermophysical properties of the Ni-based alloy Nimonic 80A up to 2400 K, III

Abstract

Nimonic 80A is a nickel–chromium alloy which is strengthened by additions of titanium and aluminum. The alloy is used for high temperature, high-strength applications. This superalloy is used in gas turbine hot section components, for hot-working applications and forging hammers. This is the third paper reporting thermophysical properties of Nimonic 80A. The optical measurement of temperature is limited by our fast pyrometers with T min = 1200 K for this material and data above about 1200 K have been reported in the previous papers [1,2]. Specific heat capacity data from 500 K up to 1500 K obtained by direct measurement using a differential scanning calorimeter have been used to compute enthalpy as function of temperature. By combining pulse heating and DSC measurements now it is possible to assign a temperature to electrical resistivity and thermal conductivity in the observed temperature range. Thermal conductivity is estimated using the Wiedemann–Franz law. The investigated specific heat capacity, enthalpy, resistivity and thermal conductivity data as function of temperature are presented and compared to literature-values.