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

  • Symposium: Neutron and X-Ray Studies of Advanced Materials VIII
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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 α 2 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.

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Acknowledgments

The authors thank Dr. Michael Oehring for the discussion about the results and Mr. Falk Dorn for the specimen preparation.

Author information

Author notes

  1. Jie Liu (Post doctoral Researcher, Researcher of Laser welding process)

    Present address: Robert Bosch GmbHAm Börstig 2, 96052, Bamberg, Germany

Authors and Affiliations

  1. Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Straße 1, 21502, Geesthacht, Germany

    Jie Liu (Post doctoral Researcher, Researcher of Laser welding process), Peter Staron (Head of Department X-ray Diffraction with Synchrotron Radiation), Stefan Riekehr (Scientist of Department Joining and Assessment), Andreas Stark (Scientist of Department Metal Physics), Norbert Schell (Scientist of Department X-ray Diffraction with Synchrotron Radiation), Norbert Huber (Head of the Division “Materials Mechanics,” Spokesman of the Helmholtz-Programme “Advanced Engineering Materials”), Andreas Schreyer (Professor, Director for Science), Martin Müller (Director of Materials Physics) & Nikolai Kashaev (Head of Department Joining and Assessment)

  2. European Spallation Source ERIC, P.O. Box 176, 221 00, Lund, Sweden

    Andreas Schreyer (Professor, Director for Science)

Authors
  1. Jie Liu
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  2. Peter Staron
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Corresponding authors

Correspondence to Jie Liu or Nikolai Kashaev.

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Manuscript submitted January 27, 2015.

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Liu, J., Staron, P., Riekehr, S. et al. Phase Transformation and Residual Stress in a Laser Beam Spot-Welded TiAl-Based Alloy. Metall Mater Trans A 47, 5750–5760 (2016). https://doi.org/10.1007/s11661-016-3745-7

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  • DOI: https://doi.org/10.1007/s11661-016-3745-7

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