Superalloys show a good combination of mechanical strength and resistance to surface degradation under the influence of chemically
active environments at high temperature. They are characterized by very high heat and creep resistance. Their main application is in gas
turbines, chemical industry, and in all those cases where resistance to creep and the aggressive corrosion environment is required. Modern
jet engines could never come into use if not for progress in the development of superalloys. Superalloys are based on iron, nickel and
cobalt. The most common and the most interesting group includes superalloys based on nickel. They carry loads at temperatures well in
excess of the eighty percent of the melting point. This group includes the H282 alloy, whose nominal chemical composition is as follows
(wt%): Ni - base, Fe - max. 1.5%, Al - 1.5% Ti - 2.1%, C - 0.06% Co - 10% Cr - 20% Mo - 8.5%. This study shows the results of thermal
analysis of the H282 alloy performed on a cast step block with different wall thickness. Using the results of measurements, changes in the
temperature of H282 alloy during its solidification were determined, and the relationship dT / dt = f (t) was derived. The results of the
measurements taken at different points in the cast step block allowed identifying a number of thermal characteristics of the investigated
alloy and linking the size of the dendrites formed in a metal matrix (DAS) with the thermal effect of solidification. It was found that the
time of solidification prolonged from less than ome minute at 10 mm wall thickness to over seven minutes at the wall thickness of 44 mm
doubled the value of DAS.