![]() ![]() The turned surface may have a longer life (> 84%) than the ground one with equivalent surface finish. The amplitude of acoustic emission signal is the most stable and sensitive signal to fatigue failure. The ground surface has higher micro- and nanohardness on surface and in the subsurface than the turned one. The turned surface has a thicker strain hardened zone and a thinner thermal affected zone than those of the ground one. The surface topographies show that skewness of the as-ground surface is much more negative than the as-tuned one while other surface parameters are equivalent. Fatigue tests were performed with an acoustic emission sensor and the signal processing software. Surface integrity was characterized by surface topography, microstructure and micro/nanohardness. ![]() Four representative surface types were prepared: as-turned, as-ground, turned and polished and ground and polished. However, the effects of distinct surface integrity by hard turning versus grinding on rolling contact life are poorly understood. Hard turning and grinding are finishing processes for the manufacture of precision components, such as bearings, gears and cams.
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June 2023
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