Abstract
The ductility of high speed steel (HSS) coated with a thin layer of titanium nitride (TiN) was studied. The testing method was based on using a conventional Charpy impact testing hammer. The impact energy required to break the TiN-coated steel square rods used as test pieces was recorded. Uncoated HSS rods were used as a reference. The effects of the sputter cleaning atmosphere and the removal of the coating by masking or subsequent grinding of the test pieces were studied. TiN-coated samples obtained from different manufacturers were also compared. It was found that the TiN coating decreased the ductility to some extent in all the cases studied.
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