Improving the Dimensional Accuracy of Combustion Chamber Throats Fabricated Using Metal PBF through Deformation Compensation Design Based on Inconel 718 Inherent Strain

초록

The additive manufacturing of aerospace propulsion system components has attracted much interest because it can be used to fabricate complex geometries in a short time. However, when nickel-based superalloys such as Inconel 718 are fabricated using the powder bed fusion laser beam (PBF-LB/M) process, high residual stresses –and deformations occur owing to steep thermal gradients and repeated melting solidification phenomena. This –inevitably results in dimensional deviations from the target geometry. In this study, a combustion chamber throat was fabricated using PBF-LB/M, and its deformation was predicted using an inherent strain-based analysis in Simufact Additive. Based on this prediction, a dimensional compensation design model was generated and printed under identical conditions. The specimens before and after the compensation design was applied were compared and analyzed. The results confirmed that dimensional errors decreased substantially in the model with the dimensional compensation design. This study demonstrated that the inherent strain-based dimensional compensation design is effective in improving the dimensional accuracy of combustion chamber throats.

키워드