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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