OBRABOTKAMETALLOV technology Vol. 27 No. 1 2025 Fig. 8. Surface of samples made of heat-resistant nickel alloy VV751P, after WEDM in the mode: a – No. 3 at 100× magnification; b – No. 4 100× magnification; c – No. 3 1,000× magnification; d – No. 4 at 1,000× magnification; e – No. 3 at 5,000× magnification; f – No. 4 at 5,000× magnification (obtained by SEM) а b c d e f The formation of microcracks and crazing in the sample machined by WEDM in mode No.3 is caused by the formation of fine crystalline structures during rapid crystallization from the melt at elevated temperatures. Increasing the height of the sample increases the exposure time of unit pulses, consequently intensifying the thermal effect. The resulting stresses cause the formation of microcracks, which can subsequently merge to form larger cracks. The surface roughness parameter Ra was 3.4 μm. Increasing the height of the workpiece being machined leads to an increased concentration of energy on the machined surface, causing secondary discharge phenomena that negatively impact the concentration
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