Issue 27

A. Brotzu et alii, Frattura ed Integrità Strutturale, 27 (2014) 66-73; DOI: 10.3221/IGF-ESIS.27.08 69 (a) (b) (c) (d) Figure 2 : SEM micrografs of the Alloy “C” specimen showing one of the cracks (a) . On the fracture surface the lamellar structure (b) , the presence of microshrinkage cavities (c) and gas porosities (d) can be clearly observed. Figure 3 : SEM micrographs showing gas porosity on the external surface of Alloy “C” specimen.