TY JOUR TI Plant for chemical thermal treatment and ultrasonic impact for surface layer strengthening in steel parts KW ultrasound KW transmitter of membrane type KW chemical thermal treatment KW nitride hardening KW surface layer JO Science intensive technologies in mechanical engineering AU Nigmetzyanov, R.I. AU Morshchilov, M.V. AU Perekryostova, V.A. AU Sergeev, I.D. AU Sukhov, A.V. PY 2018 IS 2018 PB Bryansk State Technical University