Thermophysical properties of nickel-based superalloy CM247LC

Nickel-based superalloys, which are used as gas turbine blade materials, have been produced using various methods for use in high-temperature and high-pressure environments. CM247LC is used in directional solidification (DS) to minimize the growth of grain boundaries in a direction perpendicular to the centrifugal force, to reduce stress during turbine operation. In this study, thermal conductivity was derived by measuring the thermal diffusivity and the specific heat as functions of temperature to study the thermal properties according to the directionality of DS CM247LC. Because the grain size was more than 300 μm, it was confirmed that the thermal conductivity of the superalloy with a mean free path of 1 Å was not affected by the grain boundaries.