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7309 |
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Wednesday, May 04, 2022, Hall -2.32/33 11:50 AM Pre- & Post-Treatment |
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Increase in surface strength by hammering and solid rolling of volumes produced by means of Extreme High-Speed Laser Material Deposition |
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Stephan Koss / RWTH Aachen University, Germany Lennart Sayk* / RWTH Aachen University, Germany Christoph Krull/ RWTH Aachen University - Digital Additive Production , Germany Johannes Henrich Schleifenbaum/ RWTH Aachen University - Digital Additive Production , Germany |
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Extreme High-Speed Laser Material Deposition (EHLA) is becoming increasingly used in industry in the field of additive manufacturing. The advantages of the process are high productivity and resource efficiency. For finishing, approx. 20-100 µm must be removed to achieve a polished surface. The process is mostly used for surface refinement by means of corrosion and wear protection coatings. However, it can also be used for the generation of 3D geometries. The greatest cost factor in the production of coatings is the material. With increasing requirements, for example in wear protection, cost-intensive special alloys or materials must be used. This increases production costs and thus reduces economic attractiveness. An opportunity to increase the areas of application in the field of wear resistance as well as increasing material efficiency is offered by combining EHLA with the innovative post-processing methods of hammering, solid as well as smooth rolling. With the aid of hammering as well as the solid and smooth rolling, the surface roughness can be reduced to a value of Rz 1-3 µm on the one hand and the surface hardness can be increased on the other hand. The hammering and solid rolling processes differ in their depth of impact. In the case of hammering, the impact depth can be a few millimeters and in the case of solid rolling only a few tenths of a millimeter. In the context of this study, the influence of hammering and solid rolling on a volume produced by means of EHLA is investigated. For this purpose, a volume of IN718 is built up by means of EHLA and different parameters of hammering and solid rolling and their influence on the increase in hardness as well as surface roughness are analyzed. |