“…The development of the instrumented nanoindentation method was mainly aimed at determining the microhardness of subsurface layers (see, e.g., [67][68][69]), the deformation degree of variously formed parts (see, e.g., [50,58,70]), the microstructure of materials (see, e.g., [71][72][73]), and the residual stresses in the subsurface layers of specimens generated by their previous formation (see, e.g., [74][75][76]). The determination of the material mechanical properties using the sclerometry method was also used somewhat later to investigate the microstructure and hardening of materials by estimating the indenter penetration depth into the test material (see, e.g., [77][78][79]). Recently, the tool indentation method and the sclerometry method have been used not only to determine the above-mentioned individual mechanical characteristics of the parts' subsurface layers subjected to various machining processes but also to evaluate the integral (energy) mechanical characteristics [17,80].…”