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A Preliminary Study of Deformation Behavior of Friction Stir Welded Ti-6Al-4V

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Abstract

A preliminary study of deformation behavior of friction stir welded (FSW) Ti-6Al-4V was performed using two different tools with cylindrical and stepped spiral pin design for the welding process. The nugget regions experienced temperature above β transus and the matrix transformed to fine acicular α during cooling of the nugget. By using stepped spiral pin design, a local region with much refined grain structure and significant tool debris particles were observed. Room temperature tensile test showed increased strength and decreased ductility in the material from this region. Fractographic analysis revealed that tool debris particles served as void nucleation sites. Tensile tests of FSW material were carried out at 625 °C in the strain rates of 3 × 10−4 and 1 × 10−3 s−1. The strength was higher as compared to the as-received material. Microstructural evolution during tensile test was also investigated. Results showed that dynamic globularization occurred during the high temperature tensile test.

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Acknowledgment

The authors gratefully acknowledge the Center for Aerospace Manufacturing Technology funding through the CAMT Industrial Consortium whose active members currently consist of Boeing, Rolls Royce, Spirit AeroSystems, GKN Aerospace, Bell Helicopters, Siemens, KMT Waterjet, and Steelville Manufacturing.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, MO, 65409, USA

    Jiye Wang

  2. Department of Materials Science and Engineering, University of North Texas, Denton, TX, 76203, USA

    Jianqing Su & Rajiv S. Mishra

  3. Rolls-Royce Corporation, Indianapolis, IN, 46241, USA

    Ray Xu

  4. The Boeing Company, St. Louis, MO, 63166, USA

    John A. Baumann

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  1. Jiye Wang
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  2. Jianqing Su
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  3. Rajiv S. Mishra
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Correspondence to Rajiv S. Mishra.

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Wang, J., Su, J., Mishra, R.S. et al. A Preliminary Study of Deformation Behavior of Friction Stir Welded Ti-6Al-4V. J. of Materi Eng and Perform 23, 3027–3033 (2014). https://doi.org/10.1007/s11665-014-1075-8

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  • DOI: https://doi.org/10.1007/s11665-014-1075-8

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