Evaluation on the fatigue behavior of sand-blasted AlSi10Mg obtained by DMLS
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http://orcid.org/0000-0002-0722-6518
Davide Battini
University of Brescia
http://orcid.org/0000-0002-2044-5985
Marialaura Tocci
University of Brescia
http://orcid.org/0000-0002-7515-0615
Andrea Avanzini
University of Brescia
http://orcid.org/0000-0002-7188-7687
Luca Girelli
University of Brescia
http://orcid.org/0000-0002-7630-0662
Candida Petrogalli
University of Brescia
http://orcid.org/0000-0002-1774-3914
Marcello Gelfi
University of Brescia
https://orcid.org/0000-0002-8939-811X
Abstract
In the present paper, fatigue tests were performed on sand-blasted AlSi10Mg samples produced by Direct Metal Laser Sintering (DMLS). The effect of sand-blasting on surface properties was evaluated by roughness and residual stresses measurements, together with morphological analysis, in comparison with as-built condition. An evident improvement of surface finishing was observed after sand-blasting, which also leaded to the presence of compressive residual stress on the external surface of samples, as revealed by XRD2 measurements. Furthermore, defects analysis allowed the identification of a uniform distribution of porosities in the cross section in terms of number of defects, while larger porosities seem more abundant close to the surface. It was found that the tested material exhibits good fatigue resistance, supporting the positive role of sand-blasting as a simple post-processing treatment. Superficial defects are the preferential crack initiation sites, as demonstrated by SEM analysis of fracture surfaces.
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