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7735 |
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Wednesday, September 13, 2023, Mailand 3:30 PM Additive Fertigung - Laserstrahlschweißen |
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Laserstrahlauftragschweißen im Vakuum. Mikrostruktur und mechanische Eigenschaften von in-situ legierten Titanaluminid-Bauteilen |
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Kim Schmidt* / Neue Materialien Bayreuth GmbH, Deutschland Haneen Daoud / Neue Materialien Bayreuth GmbH, Deutschland Uwe Glatzel/ University of Bayreuth - Metals and Alloys, Deutschland Johannes Weiser/ Evobeam GmbH, Deutschland |
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Titanium aluminide (TiAl) alloys have enormous potentials for high temperature applications due to their good combination between low density and high heat resistance. During the last years, several additive manufacturing processes have been developed to produce TiAl Alloys [1-5]. However, the main problem is still the manufacturing of crack-free, large-sized components with promising thermomechanical properties by a highly efficient process. In this presentation, the results of an in-situ alloying process using a double-wire laser metal deposition (LMD-w) process in vacuum with substrate heating up to 800°C will be described. High building rates up to 1kg/h combined with a pre-heating of the wires were used to additively manufacture different TiAl alloys such as Ti48Al, Ti6Al4V and TiAl3. The LMD-w process was performed under pre-vacuum (<10-3 mbar) to minimize oxidation. Heating the substrate was helpful in preventing cracking and minimizing stresses during the process. The effect of the substrate heating as well as process parameters on the microstructure will be discussed. Finally, the mechanical properties at room and high temperatures will be presented. Reference: [1] C. Körner; International Materials Reviews, 2016, 61, 361-377. [2] Bewlay, B.P. et al.; Materials at High Temperatures, 2016, 33, 1-11. [3] Thomas, M. et al.; Metall and Mat Trans, 2017, A 48 (6), 3143–3158 [4] Ma, Y. et al.; Materials Science and Engineering, 2015, A 631, 230–240 [5] Wang, L. et al.; Materials Science and Engineering; 2021; A 812, 1-13 |