Surface integrity factors influencing fatigue crack nucleation of laser powder bed fusion Ti6Al4V alloy
| Autor: | Gunnel Fredriksson, A.M. Vilardell, Frédéric Cabanettes, A. Sova, Pavel Krakhmalev |
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| Rok vydání: | 2020 |
| Předmět: |
0209 industrial biotechnology
Fusion Materials science Titanium alloy 02 engineering and technology 010501 environmental sciences Laser 01 natural sciences law.invention 020901 industrial engineering & automation law Powder bed Surface roughness General Earth and Planetary Sciences Composite material Porosity Layer (electronics) 0105 earth and related environmental sciences General Environmental Science Surface integrity |
| Zdroj: | Procedia CIRP. 94:222-226 |
| ISSN: | 2212-8271 |
| DOI: | 10.1016/j.procir.2020.09.042 |
| Popis: | The quality of the surface influences remarkably the fatigue life of additive manufactured components. This work proposes to study the influence of surface integrity on the bending fatigue life of Ti6Al4V manufactured by laser powder bed fusion. Rectangular specimens were manufactured horizontally and the last printed layer had laser track scanning directions (α=30°,60°,90°) in relation to the specimen length. The top surface 3D-roughness average was similar for all the specimens. The specimens were studied under as-built and heat-treated conditions. A correlation between laser track scanning direction, 2D-roughness parameters, and fatigue life for as-built specimens was found. The as-built specimens with 90° and 30° direction showed the shortest and the longest fatigue life, respectively. Heat-treated specimens showed a shorter fatigue life independently of the surface roughness. This could be explained by other surface integrity factors influencing fatigue performance of the material, such as the presence of subsurface porosity and surface oxygen enrichment. |
| Databáze: | OpenAIRE |
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