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|Author(s):||Y K. Chou; Christopher J. Evans;|
|Title:||White layers and thermal modeling of hard turned surfaces|
|Published:||January 01, 1998|
|Abstract:||White layers in hard turned surfaces are identified, characterized and measured as a function of tool flank wear and cutting speed. White layer depth progressively increases with flank wear. It also increases with speed, but approaches an asymptote. A thermal model based on Jaeger? s moving heat source problems (J.C. Jaeger, Moving source of heat and the temperature at sliding contacts, in: Proceedings of the Royal Society, NSW, vol. 56, pp. 203-224) is applied to simulate the temperature field in machined surfaces and to estimate white layer depth in terms of the penetration depth for a given critical temperature. The analysis shows good agreement with the trend in experimental results. White layer formation seems to be dominantly a thermal process involving phase transformation of the steel, possibly plastic strain activated; flank wear land rubbing may be a primary heat source for white layer formation. A strong material dependence of surface alteration is also observed. Published by Elsevier Science Ltd.|
|Citation:||International Journal of machine Tools and Manufacture|
|Pages:||pp. 1863 - 1881|
|Keywords:||Hard turning,phase transformation,surface integrity,White layer|
|Research Areas:||Metrology and Standards for Manufacturing Processes|