Study of variability phenomena during direct metal deposition of nickel based superalloy on residual porosity and microhardness
The article reveals the influence of the technological regimes of direct laser cultivation, as well as the adverse conditions on the microhardness and the residual porosity of the samples. The speed of movement of the working tool (from 20 mm/s to 30 mm/s, step 5 mm/s), distance between nozzle and s...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2025-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2025/03/epjconf_aapm2025_01009.pdf |
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| Summary: | The article reveals the influence of the technological regimes of direct laser cultivation, as well as the adverse conditions on the microhardness and the residual porosity of the samples. The speed of movement of the working tool (from 20 mm/s to 30 mm/s, step 5 mm/s), distance between nozzle and surface (9 mm to 13 mm, 2 mm pitch), mass flow (20.5 g/min to 30.7 g/min, 5.1 g/min pitch) and processing pause (32.0 to 48.0, 8.0) were chosen by variable factors. The influence of the mentioned factors on microhardness and residual porosity was determined, a regression model was worked out. The analysis shows that increasing powder flow and process pause reduces the variability of microhardness by the sample’ crosssection and increases its mean value, and the effective focusing distance and the melting speed have an uneven effect. The increase in the focusing distance and the melting speed clearly increase the variability of the residual porosity over the cross-section of the sample. The increase in the values of the technological pause and the powder flow have an opposite effect in the influence. |
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| ISSN: | 2100-014X |