Abstract
Titanium-containing hard metals of ISO grades P01, P10, P25 and M15 were heat treated at temperatures in the range 1150–1350 °C under nitrogen at pressures of 1 bar and 65 bar. The treatment under nitrogen was performed immediately after the sintering process. Each nitrogen treatment produced nitrogen-containing coatings of different thicknesses. The structure of these layers was investigated using X-rays, metallography and microprobe analysis. During testing of the tool life the specimens showed large improvements in crater wear resistance and in some cases in flank wear resistance too. A deterioration in the toughness behaviour of the tips was not observed. An increased nitrogen pressure would further improve the tool life behaviour.
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