Research Article
Influence Parameters on Nitriding Process of Ferromanganese Alloy
Table 3
Analysis of variances (average effect, sum of square, degree of freedom, mean square, and magnitude effect).
| Source of variance | Average effect | Sum of square (SS) | Degree of freedom | Mean square (MS) | (magnitude effect) |
| A (temperature) | 1.995 | 31.8402 | 1 | 31.8402 | 15119.9 | B (time) | 0.93 | 6.9192 | 1 | 6.9192 | 3285.708 | AB | 0.25 | 0.5 | 1 | 0.5 | 237.4341 | C (nitrogen pressure) | 1.6275 | 21.19005 | 1 | 21.19005 | 10062.48 | AC | 1.2775 | 13.05605 | 1 | 13.05605 | 6199.903 | BC | 0.2225 | 0.39605 | 1 | 0.39605 | 188.0715 | ABC | 0.2025 | 0.32805 | 1 | 0.32805 | 155.7805 | D (carbon content) | | 66.93245 | 1 | 66.93245 | 31784.09 | AD | | 17.22845 | 1 | 17.22845 | 8181.243 | BD | | 4.00445 | 1 | 4.00445 | 1901.586 | ABD | | 0.21125 | 1 | 0.21125 | 100.3159 | CD | | 14.7968 | 1 | 14.7968 | 7026.53 | ACD | | 11.2338 | 1 | 11.2338 | 5334.574 | BCD | | 0.3698 | 1 | 0.3698 | 175.6063 | ABCD | | 0.3528 | 1 | 0.3528 | 167.5335 | Error | | 0.033694 | 16 | 0.002106 | |
| Total | | 189.3931 | 31 | | |
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