Abstract

This work is an example of the improvement of quantitative fractography by means of digital image processing and light microscopy. Two techniques are presented to investígale the quantitative fracture behavior of Ti-4Al-4V heat-treated alloy specimens, under Charpy impact testing. The first technique is the Minkowski method for fractal dimensión measurement from surface profiles. revealing the multifractal character of Ti-4Al-4V fracture. It was not observed a clear positive correlation of fractal values against Charpy energies for Ti-4-Al-4V alloy specimens, due to their ductility, microstructural heterogeneity, and the dynamic loading characteristics at the region near the V-notch. The second technique reconstructs the fracture surface image, extracting in-focus regions for each picture from a stack of images acquired at successive focus positions, computing the surface roughness. The extended-focus reconstruction was used to explain the behavior along the fracture surface. TÍ-4Al-4V is the product of recycling the Ti-6Al-4V alloy by double fusión in electron beam furnace.