Investigation of the influence of surface treatment and hardening of 60С2А steel on its volumetric damage by the acoustic test method - V. R. Skalskyi; I. M. Dmytrakh; Ye. P. Pochapskyi; O. M. Mokryy; A. M. Syrotyuk; B. P. Klym; Yu. I. Kaniuk; I. M. Romanyshyn; P. P. Velykyi; P. M. Dolishniy (Materials Science (Physicochemical mechanics of materials), 2024)