Evaluation on the fatigue behavior of sand-blasted AlSi10Mg obtained by DMLS

Annalisa Pola; Davide Battini; Marialaura Tocci; Andrea Avanzini; Luca Girelli; Candida Petrogalli; Marcello Gelfi

doi:10.3221/IGF-ESIS.49.69

Evaluation on the fatigue behavior of sand-blasted AlSi10Mg obtained by DMLS

Authors

Annalisa Pola University of Brescia 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

DOI:

https://doi.org/10.3221/IGF-ESIS.49.69

Keywords:

AlSi10Mg, DMLS, Fatigue, Porosity, Sand-blasting, Scanning Electron Microscopy

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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Published

24-06-2019

Issue

Vol. 13 No. 49 (2019): July 2019

Section

Miscellanea

License

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Authors are allowed to retain both the copyright and the publishing rights of their articles without restrictions.

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How to Cite

Evaluation on the fatigue behavior of sand-blasted AlSi10Mg obtained by DMLS. (2019). Frattura Ed Integrità Strutturale, 13(49), 775-790. https://doi.org/10.3221/IGF-ESIS.49.69