OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 4 2023 Fig. 2. Surface morphology of AA5056 alloy specimen after cutting: the upper part of the cut (a, b); the central part of the cut (c, d); the lower part of the cut (e, f); optical images of the surface (a, b, c); 3D images obtained by confocal microscope (d, e, f) a b c d e f value at high cutting speed in mode No. 5 (fig. 6, a–d). For other modes, the distortions of the specimen geometry are not so significant. The smallest distortions of the cutting zone (400–450 μm) are characteristic of the specimens obtained by mode No. 4 at a cutting speed of 4.6 m/min and energy input of 4.6 kJ/m. The size of the fusion zone ranges from 100–150 μm when cutting according to mode No. 4 to 800–1,000 μm when cutting according to mode No. 5. The size of the heat affected zone does not exceed 200–300 μm, which is demonstrated by its increased etchability on metallographic sections. The structure in the fusion zone is represented by a dendritic structure formed during crystallization from the molten state (fig. 6, g, h). The heat affected zone gradually turns into the base metal with an unchanged structure (fig. 6, f, g).
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