The thermophysical properties of KhN55VMTKYu nickel-based heat-resistant alloy

Abstract

New experimental data are given for the KhN55VMTKYu industrial nickel-based heat-resistant alloy on its heat capacity at temperatures from 300 to 1000 K and on the thermal conductivity coefficient at T = 380-1450 K. The newly obtained and previously available data are used to construct approximating equations and tables of smoothed values in the range from 300 to 1200 K for heat capacity, enthalpy, average heat capacity, thermal conductivity, average coefficient of thermal expansion, density, and thermal diffusivity of the alloy. The effect of disordering of the Ni 3 (Ti, Al) intermetallic compound on the properties of the alloy is examined. The activation energy of disordering of the alloy Q = 0.93 eV and the temperature dependence of the enthalpy of disordering are estimated, as well as the concentration of intermetallic compound in the alloy.