Aerospace Technic and Technology

Parameter research results of the residual porosity of the surface layer of samples of the alloy Ti - 45Al-3Nb - Y2O3 (OX45 - 3ODS) based on titanium aluminides obtained by selective laser sintering from the effect on the parameters of the residual porosity of diamond smoothing with different modes and conditions are presented in current article. Based on the results of variance analysis, the effect of diamond smoothing modes and their pairwise interaction on the porosity parameters of the surface layer is estimated. The regularities of changing the parameters of the pore space of the surface layer of the samples (area, perimeter, eccentricity, and fractal dimension of the pore boundaries) from the feed, the force on the vigilator and its radius are established. It has been determined that for the effective application of the established modes, it is necessary to take into account the initial porosity, which has a random distribution over the surface area of the samples under study. A correlation analysis using the Pareto diagram is performed. The magnitude of the effect of diamond smoothing modes on the residual porosity is determined. The adequacy and homogeneity of the mathematical model are estimated based on the Fisher and Cochren criteria. The optimization of steeple climbing modes has been performed. The optimal processing conditions have been established from achieving a minimum residual porosity in the surface layer. Technological limitations have been determined using diamond tapping for hardening non-compact materials. Further studies are necessary for the practical application of the technology of smoothing materials based on titanium aluminides.

titanium alloy; titanium aluminides; selective laser sintering; diamond smoothing; modes; feed; force; radius; surface layer; porosity; optimization

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