TY JOUR TI Electric discharge as technological factor of intensification of chemical-thermal treatment of engineering products KW chemical-thermal treatment KW steels KW nitriding KW electrospark discharge KW glow discharge KW diffusion layer JO Science intensive technologies in mechanical engineering AU Petrova, L.G. AU Alexandrov, V.A. AU Sergeeva, A.S. PY 2019 IS 2019 PB Bryansk State Technical University