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Analysis of Quenching Parameters in AISI 4340 Steel by Using Design of Experiments

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Table 5 shows the analysis of variance of the hardness  values, a confidence level of 95% was adopted (α = 0.05)
Table 4. Results of hardness and percentage of distortion for heat  -treated samples. Sample Mean  Hardness  (HRC) Inner  diameter (%) Outside  diameter (%) Gap  opening (%) 1 56.2±1.0 0.21 0.19 2.83 2 54.7±0.9 0.18 0.12 1.89 3 59.1±1.2 0.31 0.29 3.62 4 53
Figure 5. Interaction between: a) quenchant and temperature; b) quenchant and time for hardnessThe analysis of variance was performed and the effects of
Figure 6. Main effects plot (data means) for Distortion (%).
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