Journal
ADDITIVE MANUFACTURING
Volume 21, Issue -, Pages 458-464Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.addma.2018.03.030
Keywords
Additive manufacturing; AlSi10Mg; Fatigue; Fractography; Polishing; Shot-peening
Funding
- Israel Ministry of Science, Technology and Space [2022851]
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The effect on fatigue resistance of additively manufactured (AM) AlSi10Mg specimens fabricated by selective laser melting (SLM) following surface treatment by shot-peening was investigated. Specimen surface was shot-peened with either steel or ceramic balls. Nano-indentation measurements revealed that shot-peening caused surface hardening, with the hardness profile from the surface to the interior of the bulk disappearing 50 mu m below the surface. Surfaces polished before shot-peening or following removal of about 25-30 mu m from the surface after shot-peening by either mechanical or electrolytic polishing showed improved fatigue resistance and fatigue limit. Fractography of broken specimens demonstrated that for shot-peened specimens, the site of fatigue crack initiation was deeper than that for specimens that had not undergone shot-peening. The fracture area of AM-SLM AlSi10Mg specimens before and after shot-peening displayed a ductile fracture with relatively deep dimples. In contrast to AM specimens, the final fracture area of die-cast samples exhibited a brittle fracture surface, containing numerous cleavage facets and micro-cracks.
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