<p class="MsoBodyText">Due to more freedom in design and flexibility in production parts produced by additive manufacturing technologies (AM) offer a huge potential for the manufacture of turbomachinery components. Because of the layer by layer built structure, internal defects like lack of fusion or gaseous pores can occur. These defects considerably reduce the mechanical properties and increase the importance of quality control, especially in the field of turbomachinery. Therefore, in this study, an electrochemical defect analysis (EC-D) of additive manufactured components is introduced, performed and validated in comparison to a non-destructive X-ray testing of the same part. A test rig was developed, which allows an alternation between electrochemical machining and subsequent optical documentation of each removed layer. The documentation of the surface and the macroscopic defects in the AM-parts made of Inconel 718 were captured by an integrated camera system. It was shown, that a defect analysis based on precise electrochemical machining (PECM) and optical surface evaluation is possible. Macroscopic defects in the range of 300 – 600 µm, which were detected by non-destructive testing were also found by the EC-D analysis. A removal depth of 30 µm per layer was consistently achieved, while lower removal intervals lead to fluctuations. Furthermore, small defects like gas pores, which were not detected by X-ray testing could be found with EC-D.</p>

Electrochemical Defect Analysis (Ec-D) of Additive Manufactured Components

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2021/volume/84898

Turbo Expo 2021

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