OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 1 2024 MRR values are lower for lower gap current and pulse on time values. As the gap current and pulse on time increase, the MMR also increases. With a current in the interelectrode gap of 16 A and a pulse interval of 35 μs, the SMR exceeds 7 mm3/min. With a gap current of 16 A, a magnetic induction of 0.4709 T and a pulse of 38 μs, the optimizer, using the principle of complex desirability, timely predicted the MRR value of 7.6453 mm3/min. White layer thickness (WLT) As for the primary tests, the conditions that provided the highest rate of material removal were selected to test the white layer thickness (WLT). The thickness of the white layer is shown on the two separate edges of the square holes in fi gure 5, a and b for gap current of 8 A, magnetic strength of 0.248 T, gap voltage of 55 V, pulse on time of 13 μs and pulse off time of 7 μs. Figure 5 shows that the low spark energy at 8 A gap current and 13 μs pulse on duration resulted in limited white layer formation. It should be noted that the workpiece has a very low carbon content, which means that a white layer of less thickness is formed. Figure 6, a and b illustrate the thickness of the white layer at two distinct corners of the square hole when the gap voltage is 55 V, the gap current is 8 A, the magnetic strength is 0.248 T, the pulse-on time is 38 μs, and the pulse-off time is 7 μs. Because of the higher spark energy in this trial circumstance compared to the prior case, there is a greater thickness of the white layer. The white layer thickness at two separate square hole edges is depicted in fi gure 7, a and b with gap currents of 16 A, magnetic strengths of 0.248 T, gap voltages of 55 V, pulse on time of 38 μs, and pulse off times of 7 μs. In this scenario, the processing conditions are higher: the pulse on time is 38 μs and the gap Fig. 5. WLT for Expt. 9 (Table 4) at the vertical cross-section of a square hole (a), at the horizontal cross-section of the square hole (b) Fig. 6. WLT for Expt. 14 (Table 4) at the vertical cross-section of a square hole (a), the horizontal cross-section of the square hole (b)
RkJQdWJsaXNoZXIy MTk0ODM1