Validation of FEA results by results of aero-thermal testing. Aero-Thermodynamic Loads on Lightweight Advanced Structures - ATLLAS II. D3.1.9. Final Report.

The numerical FEA model of the “CANARD” designed from TMC material by TISICS for the aero-thermal tests using the L3K facility was considered within the frame of the ATLLAS II project. As a final specification for the CANARD model, the cooling cores with exit slit geometries providing the most efficient impingement cooling effect inside of the TMC CANARD were considered for manufacture and testing. The calculations of the temperature fields, strains and stresses in the TMC part were conducted for a 0.8 mm CANARD leading edge radius according to the heat flux density provided by DLR AS-HYP. EN3B steel was examined as a cooling core material. The results are presented, discussed and compared with the experimental data received by thermal tests using the L3K facility

Correlation between porosity and processing parameters in TiAl6V4 produced by selective laser melting

This study presents the correlation between process parameters and porosity formation in a TiAl6V4 alloy produced by selective laser melting. The porosity is investigated by 2D and 3D methods aiming to identify the mechanisms of void formation, their morphology as well as volume fraction as a function of the energy density. An evident minimumvolume fraction is observed between process parameters with significant overheating and insufficient fusion. It is shown that these two marginal regions define two mechanisms of void formation. Two dominant types of voids morphology are identified and examined regarding pore orientation versus their elongation, which together with the curvature distribution analysis allow revealing critical defects

Non-destructive characterization of internal surfaces in LPBF Inconel 718 channel

The presented non-destructive computed tomography analysis method provides a comprehensive quantitative characterization of internal surfaces before and after treatment and optimizes etching methods

Non-destructive characterization of internal surfaces in Laser Powder Bed Fused Inconel 718 channels prior and after post-treatment

The effect of surface finishing treatments for inner surfaces of additvely manufactured Inconel 718 specimens were analyzed using X-ray computed tomography (CT). The tube-shaped specimens were built by Laser Powder Bed Fusion (LPBF) at different build orientations and the inner surface characteristics such as roundness, equivalent diameter, 3D curvature distribution and distance to nominal surface as radial roughness for internal channels, both in the primary as built condition and after the subsequent treatment, were evaluated