This paper describes the wear mechanism and tool life when machining Hastelloy C-22HS with coated
carbide. The experiment was conducted using four different cutting tool materials under wet condition
– namely, Physical Vapor Deposition (PVD) coated with TiAlN; TiN/TiCN/TiN; Chemical Vapor Deposition
(CVD) coated with TiN/TiCN/Al2O3; and TiN/TiCN/TiN – to study the tool behavior, in terms of wear and
tool life machining of Hastelloy C-22HS. Tool failure modes and wear mechanism were examined at
various cutting parameters. Flank wear, chipping, notching, plastic lowering at cutting edge, catastrophic
and wear at nose were found to be the predominant tool failure for the four types of cutting tools,
especially withCVDtools. Attrition/adhesion, oxidation and built-up edge (BUE) are the wear mechanisms
observed in all cutting tools. The results obtained indicated that PVD cutting tools performed better than
CVD cutting tools, in terms of tool life with current parameters.