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Table 4 Coefficients and correlation coefficients of fitting curves in Figure 10(b)

From: Subsurface Defect Evaluation of Selective-Laser-Melted Inconel 738LC Alloy Using Eddy Current Testing for Additive/Subtractive Hybrid Manufacturing

Equation \(y={\mathrm{y}}_{0}+{\mathrm{Ae}}^{{\mathrm{R}}_{0}x}\)
Defect size (mm) 0.4 0.8 1.2 1.6
Parameter Value Error Value Error Value Error Value Error
\({\mathrm{y}}_{0}\) 131.421 0.7168 139.093 1.5352 141.989 1.958 141.401 2.357
A 34.2583 1.5974 32.449 3.4572 31.987 4.1131 34.896 4.764
\({\mathrm{R}}_{0}\) − 4.591 0.5216 − 4.697 1.2232 − 4.092 1.2711 − 3.834 1.2647
\({\mathrm{R}}^{2}\) 0.983 0.915 0.880 0.867