期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 177, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2023.107965
关键词
Additive manufacturing; Fatigue Life; Surface roughness; Fracture mechanics
The fatigue behavior of AlSi10Mg alloy processed by laser-based powder bed fusion of metals (PBF-LB/M) in different conditions is evaluated. A new surface treatment method is applied to improve the fatigue strength of the alloy. A simplified fracture mechanics-based fatigue life modeling approach is developed using real-time defects distribution data and surface profilometry measurements.
The fatigue behavior of AlSi10Mg alloy processed by laser-based powder bed fusion of metals (PBF-LB/M) in as-built (AB) and surface treated conditions, is assessed. A new chemo-mechanical polishing (CMP) surface treat-ment is applied to AB specimens to achieve an average surface roughness of Sa approximate to 0.3 mu m which is more than two orders of magnitude lower than that of AB specimens (Sa approximate to 48.6 mu m). The CMP surface treatment led to a significant improvement in fatigue strength of the alloy as compared to the AB material. The fatigue life of AB + CMP specimens is discovered to be governed by surface or near surface defects, whereas the deepest surface roughness valleys play a dominant role in controlling the fatigue behavior of the AB material. A simplified fracture mechanics-based fatigue life modeling approach was developed by combining real-time defects distri-bution data from 3D computed tomography (CT) and surface profilometry measurements. The model provided a quick and effective medium for obtaining reasonable first-order fatigue life approximations for AlSi10Mg alloy fabricated using PBF-LB/M.
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