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Properties of a TiAl turbocharger wheel produced by electron beam melting

: Biamino, S.; Klöden, B.; Weißgärber, T.; Kieback, B.; Ackelid, U.

Demmer, Axel ; Fraunhofer-Institut für Produktionstechnologie -IPT-, Aachen:
DDMC 2014, Fraunhofer Direct Digital Manufacturing Conference. Proceedings : March 12-13 2014, Berlin
Stuttgart: Fraunhofer Verlag, 2014
ISBN: 3-8396-9128-1
ISBN: 978-3-8396-9128-1
Direct Digital Manufacturing Conference (DDMC) <2014, Berlin>
Conference Paper
Fraunhofer IFAM, Institutsteil Pulvermetallurgie und Verbundwerkstoffe Dresden ()

Powder of alloy Ti-48Al-2Cr-2Nb was used to fabricate turbocharger wheel prototypes by electron beam melting. This additive manufacturing technology uses an electron beam to generate parts by selectively melting the powder in a layer-by-layer way based on CAD data. The parts were fully densified with only minor percentages of build flaws. A loss of Al of about 1.4 wt% is observed, while the levels of impurities are comparable between the powder and the part. Furthermore, the microstructure was investigated after EBM and after EBM + heat treatment. It is characterized by equiaxed grains after EBM. An additional heat treatment transformed this microstructure into a fully lamellar one showing that the microstructure was homogenized.