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Laser gas alloying of TiAl6V4 with high power CO2-laser radiation

: Gasser, A.; Gillner, A.; Wissenbach, K.; Bieler, H.W.; Kreutz, E.W.; Schwarz, M.

ICALEO '87. 6th International Congress on Applications of Lasers and Electro-Optics. Proceedings
6 S. : Abb.,Lit.
International Congress on Applications of Lasers and Electro Optics (ICALEO) <6, 1987, San Diego/Calif.>
Fraunhofer ILT ()

Gaseous alloying of TiAl6V4 in a mixture of Nitrogen and Argon in order to produce TiN-rich remolten surface layers was investigated with cw and pulsed CO2-laser radiation as a function of processing parameters. The variation of laser power, beam distribution, beam diameter, and traverse speed results in different power densities, interaction times, and heating times in order to achieve different case depths with respect to surface finish, cracking, and overlapping effects of alloyed tracks covering substantial surface areas. During alloying the interaction zone is probed by a HeNe-laser to get on-line information on the dynamic fluid mechanics. The flow characteristics and the composition of the alloying gas are varied to relate processing conditions to dimension and solute content of the alloyed zone, and resultant metallurgical and mechanical properties. (ILT)