COATED CEMENTED CARBIDE INSERT COMPRISING MAIN BODY OF CEMENTED CARBIDE AND POST-TREATED COATING AS CUTTING TOOL

摘要

PURPOSE: A coated cemented carbide insert is provided to be suitable for turning a stainless steel, to sustain all the abrasion modes and to have a good toughness behavior and a good plastic deformation-resistance at intermittent cutting. CONSTITUTION: The cutting tool insert for turning a steel comprising a main body of a cemented carbide and a post-treated coating comprises a first innermost layer system having at least two TiCxNyOz layers(wherein, x + y + z 1) and a second multi-layer system composed of total 5 to 31 alternation layers of Al2O3 and TiCxNyOz(wherein, x + y + z 1). The Al2O3 layer has a separate thickness of less than 0.5 micrometers. The TiCxNyOz layer has a separate thickness of 0.01 to 0.2 micrometers.