TY CONF TI IONIC NITRIDING OF R6M5 STEEL WITH ULTRAFINE-GRAINED STRUCTURE IN A PULSE GLOW DISCHARGE KW glow discharge nitriding KW temperature KW nitrides KW hardness KW structure KW helical rolls JO Science and innovations 2021: development directions and priorities. Part 2 AU Abdirova, R.D. AU Mashekov, S.A. PY 2024 PB AUS PUBLISHERS