Abstract
The wear behaviour of laser-clad stellite alloy 6 rubbed with AISI 4140 and 4340 steels through a pin-on-disc wear test machine is studied. The stellite specimens were made from the product by laser surface cladding of stellite alloy 6 powder on the mild and medium carbon steels, respectively, by a 3.3 kW continuous wave CO 2 gas laser. The wear rate of laser clad stellite alloy 6 under loads ranging from 9.8 N to 156.8 N and sliding speed ranging from 1 m s −1 to 4 m s −1 is, in general, quite mild, except that under the load of 156.8 N and at the speed of 4 m s −1 the wear becomes a severe condition. Scanning electron microscopic examination of the worn surfaces shows that an oxide film was formed. X-ray diffraction analysis of the oxide film indicates that the oxides include W 30, Co 2O 3, Cr 2O 3, CrO and Cr 5O 12 depending on the combined effect of sliding speed and normal load. The spalling of the oxides is obviously a fatigue mechanism which controls the wear rate of the rubbing specimens. It can be shown that the oxides formed on stellite alloy 6 are tougher than that formed on AISI 4140 and 4340 steels.
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