Abstract:Based on the analysis of milling characteristic

reasonable geometric parameters of milling cutler and coated carbide grade were selected. Reasonable geometric parameters of insert were also selected through contrast experiment of tool wear resistance and tool life

and typical wear and failure form of coated carbide tools during the milling process were presented. It was shown that TiAlN-TiN coated carbide is the proper tool material for the milling process of powder metallurgy superalloy

and the cutting tool life has reached to 20~108 min within the cutting speed region of 30~70 m/min. Because of the high milling temperature and severe mechanical shock

main wear and failure form of experimental inserts can be described as chipping and peeling off in the rake face

the primary mechanisms are abrasive

adhesion

diffusion and fatigue failure.