OBRABOTKAMETALLOV technology Vol. 27 No. 1 2025 Ta b l e 6 Number of microcracks on the machined surface after copy-piercing EDM CPEDM mode Average number of microcracks per 1 mm2 0.4 C-Cr 0.35 C-Cr-Mn-Si min 28.89 26.38 max 72.35 66.35 a b Fig. 7. Surface of samples after copy-piercing EDM at 200× magnification: a – 0.4 C-Cr, min; b – 0.4 C-Cr, max; c – 0.35 C-Cr-Mn-Si, min; d – 0.35 C-Cr-Mn-Si, max c d Fig. 8. Histogram of the number of microcracks in the white layer
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