https://doi.org/10.1051/epjconf/202531801009
Study of variability phenomena during direct metal deposition of nickel based superalloy on residual porosity and microhardness
Samara University, 34, Moskovskoe sh., Samara, 443086, Russia
* Corresponding author: oleynik1997@mail.ru
Published online: 17 February 2025
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.
© The Authors, published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
