Where surfaces are load carrying and lubricated a super smooth surface is not always the best for reducing contact friction. With a smooth surface the lubricant is forced away from the mating surfaces resulting in a metal to metal contact and hence high contact stress.
The effect of Shot Peening produces a micro dimpled surface, this is as a result of plastic deformation during the shot peening process. This micro surface acts a retainer for lubricant which is slowly released during contact stress, this slow release of lubricant acts as an effective surface film which significantly reduces contact stress.
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