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<p>A super β transus post-heat treatment (PHT) was designed to evaluate the high cycle fatigue (HCF) behavior of laser powder bed fusion (LPBF)-processed Ti6Al4V. The specimens were printed in horizontal, inclined, and vertical orientations. The microstructural and mechanical characterization was carried out using optical microscopy, SEM, EDS, XRD, Vickers microhardness, and HCF tests. Interestingly, applied PHT made the isotropic microstructure with enhanced HCF compared to the as-printed Ti6Al4V at 600&#xa0;MPa stress level. Moreover, a fractal dimension analysis was done on the fractography of both the as-printed and PHT conditions for all three orientations. It was observed that the as-printed fracture surface exhibited a non-uniformity in fractal dimension values in different orientations, which shows anisotropic behavior. However, the fractal dimension values of PHT-performed specimens showed uniform crack propagation and isotropic behavior in all the orientations. The fracture surface’s signatures are well correlating with the fractal dimension values demonstrating the usefulness of the fractal dimension approach.</p>

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Fractal Dimension Analysis of Fatigue-Fractured Surface of LPBF-Processed Ti6Al4V

  • 期刊论文

  • 发表日期：

    2026年3月21日

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  • Akshay Pathania,
  • S. Anand Kumar,
  • B. K. Nagesha

摘要

A super β transus post-heat treatment (PHT) was designed to evaluate the high cycle fatigue (HCF) behavior of laser powder bed fusion (LPBF)-processed Ti6Al4V. The specimens were printed in horizontal, inclined, and vertical orientations. The microstructural and mechanical characterization was carried out using optical microscopy, SEM, EDS, XRD, Vickers microhardness, and HCF tests. Interestingly, applied PHT made the isotropic microstructure with enhanced HCF compared to the as-printed Ti6Al4V at 600 MPa stress level. Moreover, a fractal dimension analysis was done on the fractography of both the as-printed and PHT conditions for all three orientations. It was observed that the as-printed fracture surface exhibited a non-uniformity in fractal dimension values in different orientations, which shows anisotropic behavior. However, the fractal dimension values of PHT-performed specimens showed uniform crack propagation and isotropic behavior in all the orientations. The fracture surface’s signatures are well correlating with the fractal dimension values demonstrating the usefulness of the fractal dimension approach.