| Autor: |
Dey, Indira, Egorov, Sergei, Soffel, Fabian, Wegener, Konrad |
| Zdroj: |
Key Engineering Materials; December 2023, Vol. 969 Issue: 1 p49-56, 8p |
| Abstrakt: |
The ability of direct metal deposition (DMD) to fabricate complex geometries is still limited. Especially in thin-walled structures heat accumulation can lead to intolerable geometric deviation and which has to be avoided. Combining thin walls and massive sections in one layer requires parameter adapting for each section within a layer. An existing semi-empirical model predicts the optimal process parameters for the austenitic steel 1.4404. This study demonstrates the validity of the model for martensitic steel 1.4313 by an experimental campaign. The demonstrators are characterized by a massive inner part attached to a thin-walled rib. They were fabricated by DMD using constant and adapted heat input and were qualified by visual inspection, geometrical accuracy, Vickers hardness, and microstructure analysis. The demonstrators built with the adapted laser power showed enhanced geometrical accuracy which is essential for post-processing. The hardness along the symmetry plane was significantly increased, especially in the thin wall section. The study confirms the applicability of the model for martensitic steel in terms of geometrical accuracy but identifies perspectives to integrate microstructural aspects into the model. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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