TY JOUR TI Vibrowave strengthening treatment of farm machine cutting blades KW knife KW surface layer KW wear KW vibrowave treatment KW microshock KW microhardness KW hardened layer. JO Vestnik of Don State Technical University AU Koval, N.S. AU Babichev, A.P. AU Romanovskiy, I.. PY 2014 IS 14 PB Don state technical University