Enhancing the Surface Integrity of a Laser Powder Bed Fusion Inconel 718 Alloy by Tailoring the Microstructure and Microrelief Using Various Finishing Methods
Source abstract
Abstract
Heat-performance nickel-based superalloys are commonly applied in various critical industries. In this work, test samples in the form of turbine blades were manufactured by means of laser powder bed fusion (LPBF) 3D technology. This research focused on comparison of the influences of various surface finishing methods. The mechanical surface post-processing of the LPBF-manufactured Inconel 718 alloy samples consisted of ultrasonic impact treatment (UIT), ultrasonic shot peening (USP), shot peening (SP), and barrel finishing (BF). The surface microrelief was evaluated using a high-precision laser profilometer, while the microstructural features were studied by light optical microscopy (LOM), scanning/transmission electron microscopy (SEM/TEM), and X-ray diffraction (XRD). Potentiodynamic polarization tests were also conducted to compare the surface finishing methods in terms of corrosion resistance improvement of the LPBF-manufactured 718 alloy samples. The effects of the surface microstructure and hardening intensity in combination with residual stresses and surface relief coupled with roughness profile shapes on the room temperature corrosion behavior of plastically deformed 718 alloy specimens manufactured by LPBF were studied. The corrosion rate (CR) of the LPBF-manufactured samples was reduced after post-processing: BF (~16 μm/year), USP (~15 μm/year), SP (~6.5 μm/year), and UIT (~5.5 μm/year). The experimental trends also agreed well with the theoretical trends of uniform corrosion of the studied alloy.
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Research context
OpenAlex topics: Additive Manufacturing Materials and Processes · High Entropy Alloys Studies · Additive Manufacturing and 3D Printing Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Aeronautics Advanced Manufacturing Center, University of the Basque Country (UPV/EHU), 202 Bizkaia Science and Technology Park, 48170 Zamudio, Spain
Department of Laser Systems and Advanced Technologies, National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, 37 Prospect Beresteiskyi, 03056 Kyiv, Ukraine
Department of Physical Principles for Surface Engineering, G.V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine, 36 Academician Vernadsky Boulevard, 03142 Kyiv, Ukraine
Department of Welded Joints Strength, E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, 11 Kazymyr Malevych Street, 03150 Kyiv, Ukraine
Department of Manufacturing Technology, West Pomeranian University of Technology, 17 Aleja Piastow, 70310 Szczecin, Poland
Department of Physics of Strength and Plasticity of Materials, Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, 3 Omeliana Pritsaka Street, 03142 Kyiv, Ukraine
Department of Mechanical Engineering, University of the Basque Country (UPV/EHU), 1 Plaza Ingeniero Torres Quevedo, 48013 Bilbao, Spain
Funding
European Union’s HORIZON 2020 Research and Innovation Programme under the Marie Sklodowska-Curie · National Research Foundation of Ukraine under the Science for the Recovery of Ukraine in the War and Post-War Periods · Basque Government · MCIN/AEI/10.13039/501100011033 and the European Union Next Generation EU/PRTR · National Academy of Sciences of Ukraine
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