OBRABOTKAMETALLOV technology Vol. 27 No. 1 2025 allows for both qualitative and quantitative analysis of the changes that occurred on the material’s surface during the tests. Results and Discussion In this study, samples of heat-resistant nickel alloy VV751P produced by WEDM at minimum and maximum modes, were analyzed. The surface layer of the samples was evaluated qualitatively and quantitatively using an Olympus GX51 optical microscope at ×200 magnification (Fig. 3). It was observed that, with WEDM, the size of the defective white layer remained consistent at both modes and was 10 μm. Varying the processing parameters within this range did not significantly impact the thickness of the defect layer. Fig. 4 shows the surface of a heat-resistant nickel alloy VV751P sample processed by WEDM at the minimum mode (Mode No.1). Scanning electron microscopy (SEM) revealed no surface defects in the form of pores or cracks. During the WEDM process, spark discharges occur, and a microvolume of molten a b Fig. 2. Equipment for studying the effect of cyclic tests on surface deformation: a – Servo-hydraulic universal testing machine Biss-00-100; b – Interferometer-profilometer NewView 5010 a b Fig. 3. Structure of the surface layer of VV751P samples after WEDM in: a – minimum mode; b – maximum mode
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