Abstract
The selective laser melting (SLM) is an additive manufacturing process applied to fabricate the metal parts owing to the melting of the metal powder in a layer by layer approach. The combined thermo-mechanical techniques for the post-processing of Ni-Cr-Fe alloy parts fabricated by the SLM process are proposed. In this study, the flat parts were fabricated using a nickel-based pre-alloyed Inconel 718 powder. The hot isostatic pressing (HIP) followed by homogenization (H) and/or aging (A) was carried out to modify the structure of the material and reduce the porosity. The shot peening (SP) and ultrasonic impact treatment (UIT) using a seven-pin impact head were applied to improve the surface texture parameters and stress state. The surface texture and hardness of the SLM-built and thermo-mechanical post-processed Inconel 718 specimens are studied and compared. Results indicated that the used mechanical surface treatments after heat treatments led to a further increase in the surface hardness and formation of a new surface microrelief. As compared to the SP process, the UIT process forms regular microrelief with smoother surface roughness and lower height profile parameters while the SP-induced surface hardness is higher than that of the UIT-processed specimen.
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Acknowledgments
The authors would like to acknowledge S. Faust (Otto von Guericke University Magdeburg, Germany) for the surface topography measurements.
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Lesyk, D., Martinez, S., Pedash, O., Dzhemelinskyi, V., Mordyuk, B. (2020). Combined Thermo-Mechanical Techniques for Post-processing of the SLM-Printed Ni-Cr-Fe Alloy Parts. In: Ivanov, V., Trojanowska, J., Pavlenko, I., Zajac, J., Peraković, D. (eds) Advances in Design, Simulation and Manufacturing III. DSMIE 2020. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-50794-7_29
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