Nature of wear of contact areas of rake and flank faces of cutting inserts of Al₂O₃-TiC + Ti-TiAlN-(ZrNbTiAl)N after 12 min of cutting with damping of a workpiece of hardened steel C45 HRC 52 at V_c  = 600 m/min; f = 0.1 mm/rev; a_p  = 0.15 mm. a − general view of wear on rake face; b − nature of wear of coating and of ceramic substrate on rake face; c − type of wear of coating and substrate on rake face at cross-cut section; d − type of wear of coating and substrate on flank face at cross-cut section.