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Effect of Heat Treatment on Friction Stir Welded Dissimilar Titanium Alloys

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Mechanics of Additive and Advanced Manufacturing, Volume 9

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Abstract

A significant drop in the hardness values have been achieved in the friction stir welded dissimilar titanium alloys after post weld heat treatment. A closer look at the microstructural evolution suggests that the heat treatment at 933 °C changes the microstructure in the weld nugget from globular blocky grains to distinct microstructure with β flakes distributed uniformly in the α phase. With Ti-6242 FG (β transus = 996 °C), and Ti-54 M (β transus = 966 °C) being on the retreating and advancing side respectively, a series of microstructure evolves from retreating to advancing side. With a difference in the composition of the alloys, difference in the diffusion of elements is also responsible for the corresponding microstructure. Diffraction patterns were measured by X-ray diffraction method. Diffraction peaks for ADV side were slightly shifted towards left in comparison with retreating, and center of the weld along with significant difference in the preferred crystal orientation between as welded and post weld heat-treated conditions.

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Acknowledgements

We sincerely thank Dr. Dan Sanders, and The Boeing Company for providing the material and for continuous support. We express our gratitude toward University of Washington for supporting our research.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Washington, Seattle, WA, 98195, USA

    Kapil Gangwar & M. Ramulu

Authors
  1. Kapil Gangwar
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  2. M. Ramulu
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Corresponding author

Correspondence to Kapil Gangwar .

Editor information

Editors and Affiliations

  1. Mechanical Engineering, University of Washington, Seattle, Washington, USA

    Junlan Wang

  2. Sandia National Laboratories, Livermore, California, USA

    Bonnie Antoun

  3. Los Alamos National Laboratory, Los Alamos, New Mexico, USA

    Eric Brown

  4. Neil Armstrong Hall, Purdue University, West Lafayette, Indiana, USA

    Weinong Chen

  5. University of Illinois, Urbana-Champaign, Illinois, USA

    Ioannis Chasiotis

  6. United States Naval Academy, Annapolis, Maryland, USA

    Emily Huskins-Retzlaff

  7. Sandia National Laboratories, Albuquerque, New Mexico, USA

    Sharlotte Kramer

  8. Dow Chemical Company, Lake Jackson, Texas, USA

    Piyush R. Thakre

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Gangwar, K., Ramulu, M. (2018). Effect of Heat Treatment on Friction Stir Welded Dissimilar Titanium Alloys. In: Wang, J., et al. Mechanics of Additive and Advanced Manufacturing, Volume 9. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-62834-9_7

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  • DOI: https://doi.org/10.1007/978-3-319-62834-9_7

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-62833-2

  • Online ISBN: 978-3-319-62834-9

  • eBook Packages: EngineeringEngineering (R0)

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