Phase Transformation and Residual Stress in a Laser Beam Spot-Welded TiAl-Based Alloy
- Liu, Jie
- Staron, Peter
- Riekehr, Stefan
- Stark, Andreas
- Schell, Norbert
- Huber, Norbert
- Schreyer, Andreas
- Müller, Martin
- Kashaev, Nikolai
Publication date
January 2016
DOI Publisher
Springer ISSN
1073-5623 Citation count (estimate)
2Abstract
The microstructure, chemical composition, residual stress, and lattice parameter evolution ofthe welding zone (WZ) and heat-affected zone (HAZ) of a laser-beam-welded TiAl-based alloywere investigated. It was found that both a2 and c phases remain highly restrained in the WZedge, and the stresses are relieved in the HAZ. A grain refinement mechanism is proposed,which works by heating the material to the b or a+b phase field for a short time. The lamellarcolonies are refined by the Nb-enriched segregations
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