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phu_grassman: 金币+3, thanks 2013-03-21 09:16:34
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With the effect of contact stress, the increasing  speed produces  initiation crack or speeds up the expansion of the existing crack  in defect ,which will lead to a coating layer peeling off.
At low speeds, some poor interlayer combined with the weak area of coating surface will peel off due to the "sticky effect", and "the transfer film" on the  coating  surface  protects the coating itself well, so that the layer peeling is not obvious and makes small wear
With the increasing speed, the  formation and the extension speed of coating internal crack increases,  after the crack converges, coating is peeling off with the slice shape, which can induce the peeling coating spalling in surrounding, and the wear volume is bigger.
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