Abstract
The laser additive manufacturing technology is studied that applies lasers to fabricate the complexly shaped parts by successive selective melting of the metal powder in a layer by layer process. The turbine blade test parts were manufactured by the selective laser melting (SLM) process using an Inconel 718 powder. A multidirectional scanning strategy was used during SLM. The paper is focused on the study of the surface features and material characteristics of the SLM-printed parts. The surface texture supplemented by roughness profile parameters is analyzed. The microstructure, material compositions, material phases, porosity, and hardness in the near-surface layers are also addressed. Microstructural studies were performed by the X-ray diffraction analysis, optical microscopy, and scanning electron microscopy. Results indicated that partially melted powder particles, balling, and signs of the laser tracks are formed on the side surfaces of SLM-built turbine blades. The columnar dendritic microstructure mainly consists of a base γ-phase matrix and \( \gamma^{||} \)-phase precipitates. The SLM-built turbine blade parts show the accumulation of porosity close to the surface.
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Lesyk, D., Martinez, S., Dzhemelinkyi, V., Lamikiz, A. (2020). Additive Manufacturing of the Superalloy Turbine Blades by Selective Laser Melting: Surface Quality, Microstructure and Porosity. In: Karabegović, I. (eds) New Technologies, Development and Application III. NT 2020. Lecture Notes in Networks and Systems, vol 128. Springer, Cham. https://doi.org/10.1007/978-3-030-46817-0_30
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DOI: https://doi.org/10.1007/978-3-030-46817-0_30
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