Effects of the laser beam superficial heat treatment on the gas Tungsten arc Ti-6al-4v welded metal microstructure

I. Voiculescu; Octavian Dontu; V. Geanta; S. Ganatsios

doi:10.1117/12.801972

29 April 2008 Effects of the laser beam superficial heat treatment on the gas Tungsten arc Ti-6al-4v welded metal microstructure

I. Voiculescu, Octavian Dontu, V. Geanta, S. Ganatsios

Author Affiliations +

Proceedings Volume 7007, INDLAS 2007: Industrial Laser Applications; 70070M (2008) https://doi.org/10.1117/12.801972
Event: INDLAS 2007: Industrial Laser Applications, 2007, Bran, Romania

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.

Citation Download Citation

I. Voiculescu, Octavian Dontu, V. Geanta, and S. Ganatsios "Effects of the laser beam superficial heat treatment on the gas Tungsten arc Ti-6al-4v welded metal microstructure", Proc. SPIE 7007, INDLAS 2007: Industrial Laser Applications, 70070M (29 April 2008); https://doi.org/10.1117/12.801972

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