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Abstract
Dry sliding wear occurs when two bodies are in sliding contact. During the process of sliding, fragments may be pulled out from one surface and they may stick on to the other. Later on, these may get transferred back or may become loose wear particles. This paper reports the effects of different experimental conditions on the dry sliding wear behaviour of nickel based alloy (Colmonoy) surface produced by plasma transferred arc (PTA) hardfacing process. The wear test was conducted in a pin on roller wear testing machine, under constant sliding distance of 1 km. Mathematical models were developed to estimate wear rate incorporating rotational speed, applied load and roller hardness using statistical tools such as design of experiments, regression analysis and analysis of variance. It is found that the wear resistance of the PTA hardfaced nickel based alloy (Colmonoy) surface is five times better than that of the substrate (carbon steel).