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Table 3 Coefficients and correlation coefficients of fitting curves in Figure 10(a)

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

Equation \(y=\frac{{\mathrm{A}}_{1}-{\mathrm{A}}_{2}}{1+{(x/{\mathrm{x}}_{0})}^{\mathrm{p}}}+{\mathrm{A}}_{2}\)
Defect size (mm) 0.4 0.8 1.2 1.6
Parameter Value Error Value Error Value Error Value Error
\({\mathrm{A}}_{1}\) 0.213 0.0046 0.486 0.0063 0.688 0.0093 1.00237 0.0161
\({\mathrm{A}}_{2}\) − 0.002 0.0162 0.054 0.0180 0.087 0.0250 0.0921 0.0578
\({\mathrm{x}}_{0}\) 0.779 0.0573 0.725 0.0296 0.719 0.0290 0.80069 0.0474
p 2.478 0.3440 2.579 0.2271 2.689 0.0250 2.61041 0.3067
\({\mathrm{R}}^{2}\) 0.994 0.998 0.997 0.996