Abstract
The wear of TiN coatings in dry rolling contact with a non-uniform Hertzian stress distribution has been studied. Wear behaviour was observed in situ and the mechanisms of damage were examined by optical and electron microscopy and laser profiling. Changes of friction coefficient, weight, residual stress, percentage of undamaged TiN, and surface roughness were also observed. The failure mechanism of TiN coated SAE 52100 steel running against steel rollers was dominated by microcracking, transfer of material, and fatigue; that of TiN against TiN (both on M2 tool steel substrates) was principally adhesive failure, which occurred at the near surface carbides in the steel. Tests involving TiN coated rollers running against TiN coated rollers lasted 39 800 rolling contact cycles, whereas TiN versus steel failed after 8600 cycles and steel versus steel after less than 1700 cycles.
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