Fig. 11

Surface analysis depicting the different topographies of the samples. (a-c) The topography under the cutting speed 30 m.min⁻¹ on areas A-C, (d-f) the topography under the cutting speed 60 m.min⁻¹ on areas A-C and (g-i) the topography under the cutting speed 30 m.min⁻¹ on the area D.