The prospects for additive manufacturing of bulk TiAl alloy

M. Thomas (1) , T. Malot (2) , P. Aubry (3) , C. Colin (4) , T. Vilaro (5) , Pierre Bertrand (6)

1 ONERA - The French Aerospace Lab [Châtillon]
2 ENSAM - École Nationale Supérieure d'Arts et Métiers
3 SEARS - Service d'études analytiques et de réactivité des surfaces
4 Mines Paris - PSL (École nationale supérieure des mines de Paris)
5 Airbus Saint Eloi
6 ENISE - Ecole Nationale d'Ingénieurs de Saint Etienne

This paper deals with the prospects for additive manufacturing (AM) of bulk TiAl alloys. A number of AM processes have already been explored in the literature for these intermetallic alloys. The main trend developed in published works concerns a strong crack sensitivity of this relatively brittle material due to rapid successive heating and cooling cycles. Optimized processing conditions have already been achieved for producing sound and crack-free TiAl materials by means of EBM and LMD processes. This experimental work was particularly focused on the third process, i.e. SLM, to produce fully dense TiAl parts. A series of beads, surface layers and cubes have been manufactured to investigate the microstructural evolution. Post heat treatments allowed a uniform microstructure to be restored for the intermetallic TiAl alloy.

Mots clés: GAMMA TITANIUM ALUMINIDE; SELECTIVE LASER MELTING; LASER METAL DEPOSITION; ELECTRON BEAM MELTING; HEAT TREATMENTS

Mots clés: ALUMINIURE DE TITANE; FUSION LASER SÉLECTIVE; PROJECTION LASER MÉTALLIQUE; FUSION PAR FAISCEAUX D’ÉLECTRONS; TRAITEMENTS THERMIQUES

Domaines: Matériaux

M. Thomas, T. Malot, P. Aubry, C. Colin, T. Vilaro, et al.. The prospects for additive manufacturing of bulk TiAl alloy. Materials at High Temperatures, 2016, 33 (4 et 5), p. 571-577. ⟨10.1080/09603409.2016.1171510⟩. ⟨hal-01401714⟩