Research Article
Multiobjective Optimization for Forming Process Parameters of Ultrahigh Strength Steel BR1500HS
Table 5
Analysis of variance (ANOVA) for the quenching hardness.
| | Source | Sum of squares | Free degree | Mean square | F value | value |
| | Model | 117.33 | 5 | 22.53058 | 32.07949 | 0.0001 | | T | 112.6529 | 1 | 26.40333 | 37.5936 | 0.0005 | | t | 26.40333 | 1 | 16.33333 | 23.25573 | 0.0019 | | T×t | 16.33333 | 1 | 4.41 | 6.279048 | 0.0406 | | T2 | 4.41 | 1 | 63.7092 | 90.71046 | <0.0001 | | t2 | 63.7092 | 1 | 0.962538 | 1.370482 | 0.2800 | | Residual | 4.916351 | 7 | 0.702336 | — | — | | Lack of fit | 4.916351 | 3 | 1.638784 | — | — | | Pure error | 0 | 4 | — | — | — | | Cor total | 117.5692 | 12 | — | — | — | | R2 = 0.9582 | = 0.9283 | Pred R2 = 0.5808 | Adeq precision = 19.584 |
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