Table 4
Design matrix and experimental results.
| | Serial number | Peak current (Amperes) | Back current (Amperes) | Pulse rate (pulses/second) | Pulse width (%) | Grain size (Microns) | Hardness (VHN) | Ultimate tensile strength (UTS) (Mpa) |
| | 1 | −1 | −1 | −1 | −1 | 20.812 | 198 | 713 | | 2 | 1 | −1 | −1 | −1 | 30.226 | 190 | 705 | | 3 | −1 | 1 | −1 | −1 | 21.508 | 199 | 718 | | 4 | 1 | 1 | −1 | −1 | 27.536 | 193 | 706 | | 5 | −1 | −1 | 1 | −1 | 27.323 | 193 | 706 | | 6 | 1 | −1 | 1 | −1 | 25.206 | 195 | 710 | | 7 | −1 | 1 | 1 | −1 | 25.994 | 195 | 705 | | 8 | 1 | 1 | 1 | −1 | 23.491 | 197 | 706 | | 9 | −1 | −1 | −1 | 1 | 26.290 | 194 | 705 | | 10 | 1 | −1 | −1 | 1 | 29.835 | 190 | 700 | | 11 | −1 | 1 | −1 | 1 | 20.605 | 200 | 715 | | 12 | 1 | 1 | −1 | 1 | 27.764 | 193 | 708 | | 13 | −1 | −1 | 1 | 1 | 30.095 | 190 | 698 | | 14 | 1 | −1 | 1 | 1 | 26.109 | 194 | 706 | | 15 | −1 | 1 | 1 | 1 | 27.385 | 193 | 704 | | 16 | 1 | 1 | 1 | 1 | 25.013 | 195 | 710 | | 17 | −2 | 0 | 0 | 0 | 20.788 | 196 | 710 | | 18 | 2 | 0 | 0 | 0 | 25.830 | 195 | 706 | | 19 | 0 | −2 | 0 | 0 | 31.663 | 188 | 701 | | 20 | 0 | 2 | 0 | 0 | 27.263 | 193 | 708 | | 21 | 0 | 0 | −2 | 0 | 25.270 | 195 | 712 | | 22 | 0 | 0 | 2 | 0 | 26.030 | 194 | 705 | | 23 | 0 | 0 | 0 | −2 | 24.626 | 195 | 711 | | 24 | 0 | 0 | 0 | 2 | 26.626 | 194 | 705 | | 25 | 0 | 0 | 0 | 0 | 24.845 | 196 | 710 | | 26 | 0 | 0 | 0 | 0 | 24.845 | 196 | 710 | | 27 | 0 | 0 | 0 | 0 | 20.145 | 200 | 720 | | 28 | 0 | 0 | 0 | 0 | 24.845 | 195 | 710 | | 29 | 0 | 0 | 0 | 0 | 20.045 | 201 | 718 | | 30 | 0 | 0 | 0 | 0 | 24.845 | 195 | 710 | | 31 | 0 | 0 | 0 | 0 | 20.445 | 198 | 712 |
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