Issue 49

A. Pola et alii, Frattura ed Integrità Strutturale, 49 (2019) 775-790; DOI: 10.3221/IGF-ESIS.49.69

Figure 13 : SEM images of different areas on fatigue fracture surface: a-c) close to the nucleation point and d) close to the end of the crack propagation region.

Figure 14 : SEM images of the fracture surface showing the typical defects which started the failure: a) porosities, b) lack of fusion defects, c-d) defects coupled with surface micro-depressions.

C ONCLUSIONS

he main aim of the present paper was the evaluation of the effect of sand-blasting on fatigue resistance of AlSi10Mg samples produced by DMLS. A preliminary characterization of sample surfaces was carried out before and after sand-blasting. It was found that this post-treatment is effective in reducing surface roughness and was also responsible for a change from tensile to compressive residual stresses on material surface. These results suggested a positive T

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