Phase Transformation and Residual Stress in a Laser Beam Spot-Welded TiAl-Based Alloy

Liu, J.; Staron, P.; Riekehr, S.; Stark, A.; Schell, N.; Huber, N.; Schreyer, A.; Mueller, M.; Kashaev, N.

Journalpaper

Phase Transformation and Residual Stress in a Laser Beam Spot-Welded TiAl-Based Alloy

Abstract

The microstructure, chemical composition, residual stress, and lattice parameter evolution of the welding zone (WZ) and heat-affected zone (HAZ) of a laser-beam-welded TiAl-based alloy were investigated. It was found that both α2 and γ phases remain highly restrained in the WZ edge, and the stresses are relieved in the HAZ. A grain refinement mechanism is proposed, which works by heating the material to the β or α + β phase field for a short time. The lamellar colonies are refined by the Nb-enriched segregations.

DOI Link to Publication

URL: https://publications.hereon.de/id/34668/
Authors:Liu, J., Staron, P., Riekehr, S., Stark, A., Schell, N., Huber, N., Schreyer, A., Mueller, M., Kashaev, N.
Year:2016
In: Metallurgical and Materials Transactions A
Volume:47
Issue:12
Pages:5750 - 5760
Publisher:Springer, Warrendale, PA
Type:Journalpaper
ISSN: 1073-5623
Cite as: Liu, J.; Staron, P.; Riekehr, S.; Stark, A.; Schell, N.; Huber, N.; Schreyer, A.; Mueller, M.; Kashaev, N.: Phase Transformation and Residual Stress in a Laser Beam Spot-Welded TiAl-Based Alloy. In: Metallurgical and Materials Transactions A. Vol. 47 (2016) 12, 5750 - 5760. (DOI: 10.1007/s11661-016-3745-7)