Fig. 4.

The Micro-CT 3D reconstruction models and internal defect images of the NiTi-C, NiTi-O, NiTi-T, and TC4-O porous scaffolds following LPBF molding, with the cylindrical porous scaffold measuring φ3 mm × 5 mm. A, D, G and J: The Micro-CT 3D reconstruction models, highlighting both positive and negative surface deviations of the porous NiTi alloy scaffold. B, E, H and K: The reconstructed internal defect images demonstrated that the defects were uniformly distributed throughout the porous NiTi alloy scaffold. C, F, I and L: The micro-CT reconstruction model was superimposed with the CAD model to ascertain the dimensional deviation. The average deviations for the NiTi-C(C), NiTi-O(F), NiTi-T(I), and TC4-O(L) porous scaffolds were measured at 0.013 mm, 0.015 mm, 0.016 mm, and 0.025 mm, respectively.