Abstract
The morphologies of roll surfaces are modified with pulsed Nd:YAG laser and characterized by topography measuring instrument (WYKO-16 DRT2TC). Sombrero shaped bumps with diameters of 230-250 μm and heights of 2-4 μm are produced by out-of-focus laser beam. In laser surface heating, the cooling rate is high enough for all the material that undergoes austenitic transformation to be transformed into martensite. To explain the mechanism leading to the surface topography resulting from the Nd:YAG laser texturing of roll surface. A quantitative model is proposed to predict the bump formation during martensitic transformation. The results show: the bump height caused by martensitic transformation is very small. The key factor of macroscopic bump formation on roll surface during laser texturing is surface tension of molten metal.
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