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Proceedings Paper

Effects of the laser beam superficial heat treatment on the gas Tungsten arc Ti-6al-4v welded metal microstructure
Author(s): I. Voiculescu; Octavian Dontu; V. Geanta; S. Ganatsios
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Paper Abstract

The microstructure of the weld and the extent to which it is different from the thermo-mechanically processed base material is strongly influenced by the thermal cycle of welding. The mechanical properties of composite weld structures in titanium alloys depend on structural characteristics of each region (weld, base material and heat affected area), influenced by the specific thermal cycle imposed during welding and the subsequent post-weld heat treatment. In order to improve the as-welded metal toughness and ductility, the welded metal was subjected to various post weld laser heat treatments, above and below beta transus temperature in a shielding atmosphere of pure argon. Standard micro-hardness measurements and tensile strength techniques showed higher mechanical properties of the heat treated samples in different conditions with respect to the base metal. Metallographic investigations attribute this to the formation of α'phases in heat treated material, especially in the weld metal.

Paper Details

Date Published: 29 April 2008
PDF: 6 pages
Proc. SPIE 7007, INDLAS 2007: Industrial Laser Applications, 70070M (29 April 2008); doi: 10.1117/12.801972
Show Author Affiliations
I. Voiculescu, Polytechnical Univ. of Bucharest (Romania)
Octavian Dontu, Polytechnical Univ. of Bucharest (Romania)
V. Geanta, Polytechnical Univ. of Bucharest (Romania)
S. Ganatsios, West-Macedonia Univ. (Greece)

Published in SPIE Proceedings Vol. 7007:
INDLAS 2007: Industrial Laser Applications
Mircea Udrea, Editor(s)

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