Enhancing fatigue life of additive manufactured parts with electrospark deposition post-processing
| Autor: | Stephen Peterkin, Reza Esmaeilizadeh, Ehsan Toyserkani, Ali Keshavarzkermani, Pablo D. Enrique, Hamid Jahed, Norman Y. Zhou |
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| Rok vydání: | 2020 |
| Předmět: |
0209 industrial biotechnology
Materials science Metallurgy Biomedical Engineering Peening Fatigue testing 02 engineering and technology Surface finish 021001 nanoscience & nanotechnology Industrial and Manufacturing Engineering law.invention High surface Critical surface 020901 industrial engineering & automation law Surface roughness General Materials Science Hammer 0210 nano-technology Electrospark deposition Engineering (miscellaneous) |
| Zdroj: | Additive Manufacturing. 36:101526 |
| ISSN: | 2214-8604 |
| DOI: | 10.1016/j.addma.2020.101526 |
| Popis: | Metal additive manufacturing processes allow for the production of highly dense parts with increased geometric freedom and less waste than traditional manufacturing techniques. However, one of the biggest challenges in using these parts is the relatively high surface roughness inherent to the manufacturing process. This roughness negatively affects fatigue properties and necessitates the use of post-processing surface treatments. Several methods are presented for improving local surface properties of laser powder bed fusion parts using electrospark deposition (ESD), hammer peening and heat-treatment processes. An optimized surface roughness reduction of 82% and near-surface hardness increase of 85% is obtained. Post-processed Hastelloy X parts reach > 107 cycles during fatigue testing at 350 MPa, in comparison to failure at 105 cycles in the as-built condition. The improvement in mechanical properties obtained with a combined ESD and peening process shows potential for the selective enhancement of critical surface regions in additive manufactured parts. |
| Databáze: | OpenAIRE |
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