A. Jawaid et al., Cutting performance and wear characteristics of PVD coated and uncoated carbide tools in face milling Inconel 718 aerospace alloy, J MATER PR, 116(1), 2001, pp. 2-9
In this paper, cutting performance and failure characteristics of two PVD T
iN coated and an uncoated tungsten carbide grades with identical geometry a
re presented. Face-milling tests of Inconel 718 superalloy were performed t
o investigate the effect of cutting speed and feed rate on tools performanc
e under wet conditions. Tools were thoroughly examined under SEM at two sta
ges in order to reveal the failure modes and wear mechanisms. These stages
were after cutting for 5 s and when the tool failed. It was noted that the
coating resulted in a marginal improvement, as it was delaminated by adheri
ng workpiece material at the beginning of the cut, impeding the performance
of the tool for the rest of the experiment. A combination of progressive c
hipping and flank wear was the general mode of tool failure, former being d
ominant at high speeds and the latter at the low speed region. Results show
ed that uncoated tool performed better than coated tools at low cutting spe
eds while coated tools gave slightly better performance as the speed was ra
ised. (C) 2001 Elsevier Science B.V. All rights reserved.