TY JOUR TI Gas-cycling processes of chemical and thermal treatment: regulation of the nitride layer structure for iron and steel KW gas-cycling nitride hardening KW steels KW diffuse layer KW internal nitriding zone KW carbonitride zone KW wear resistance JO Science intensive technologies in mechanical engineering AU Petrova, L.G. AU Belashova, I.S. PY 2024 IS 2024 PB Bryansk State Technical University