The acoustic properties of the new alloys (Inconel 52 and Inconel 52MSS) based on the system of NiCrFe firstly investigated in a wide temperature range of 77—1200 K. As found in the Inconel 52, the behaviour of high temperature background of acoustic absorption correlates with the temperature range of failure of the plasticity. As experimentally established, the availability of more effective pinning centres hindering the dislocation mobility creates the preconditions for a more uniform distribution of dislocations that leads to the absence of gradients of local stresses that, in turn, provides a high heat resistance and hot cracking resistance of the alloy Inconel 52MSS. As shown, the acoustic characteristics of alloys of different alloying systems allow establishing differences in the propensity for hot cracking.