The study consisted in assessing the influence of surface and volume modification on the characteristics of high-temperature creep of
castings made of waste products of nickel-based superalloys IN 713C and the MAR-247. The results of high-temperature creep tests
performed under conditions of two variants of research were analysed. The characteristics of creep according to variant I were obtained on
the basis of earlier studies of these alloys with the parameters T=982o
C, σ=150MPa [1]. Variant II included carrying out creep tests of
alloy IN713C with the parameters T=760o
C, σ =400MPa and alloy MAR247 with the parameters: T=982o
C, σ=200MPa.Developed creep
characteristics were compared with the results of these alloys with the parameters according to variant I of the study. It was observed that
the conditions of experiments carried out depending upon the value of the creep test temperature and stress with the creep stability depends
on the size of the macrograin (I variant of the studies) or such influence was not observed (II variant of the studies). Stability of samples
with coarse structure in variant I of creep tests was significantly higher than the samples with fragmented grain. It was found that the
observed stability conditions are dependent on the dominant deformation mechanisms under creep tests carried out - diffusion mechanism
in variant I and a dislocation mechanism in variant II of the study. The conditions for the formation and growth of the cracks in the tested
materials, including the morphological characteristics of their macro-and microstructure were tested.