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The Effect of Friction Stir Processing on the Mechanical Properties of Investment Cast and Hot Isostatically Pressed Ti-6Al-4V

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Abstract

Friction-stir (FS) processing was used to modify the coarse, fully lamellar microstructure of investment cast and hot isostatically pressed (HIP’ed) Ti-6Al-4V. The effect of FS processing on mechanical properties was investigated using microtensile and four-point bend fatigue testing. The tensile results showed a typical microstructure dependence where yield strength and ultimate tensile strength both increased with decreasing slip length. Depending on the processing parameters, fatigue strength at 107 cycles was increased by 20 pct or 60 pct over that of the investment cast and HIP’ed base material. These improvements have been verified with a statistically significant number of tests. The results have been discussed in terms of the resistance of each microstructure fatigue crack initiation and small crack propagation. For comparison, a limited number of fatigue tests was performed on α + β forged Ti-6Al-4V with varying primary α volume fraction and also on investment cast material heat treated to produce a bi-lamellar condition.

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Acknowledgments

This work was supported by the Office of Naval Research (N00014-06-1-0089). The authors are grateful to J. Ault (Precision Castparts Corp., Portland, OR) for providing the investment cast material and to Professor A.P. Reynolds and Dr. W. Tang (University of South Carolina, Columbia, SC) for subtransus FS processing. Dr. Z.T. Li and The Edison Welding Institute (EWI) are acknowledged for performing supertransus FS processing. The authors also acknowledge Dr. A.H. Rosenberger (Air Force Research Laboratory, Wright Patterson Air Force Base, OH) for his assistance with all aspects of developing a robust fatigue testing method. K. May and Professor M.J. Mills (The Ohio State University, Columbus, OH) are acknowledged for technical assistance with the microtensile experiments and for useful discussions. One author (A.L.P.) is grateful to the Air Force Research Laboratory management for encouragement and support from Air Force contract FA8650-07-D-5800 during the preparation of this manuscript.

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  1. A. L. Pilchak (Graduate Research Associate, Visiting Scientist, Research Scientist)

    Present address: Materials and Manufacturing Directorate, Metals Processing Group, Air Force Research Laboratory, Wright-Patterson Air Force Base, Columbus, OH, 45433, USA

Authors and Affiliations

  1. Department of Materials Science and Engineering, The Ohio State University, Columbus, OH, 43210, USA

    A. L. Pilchak (Graduate Research Associate, Visiting Scientist, Research Scientist) & J. C. Williams (Professor and Honda Chair Emeritus)

  2. Universal Technology Corporation, Dayton, OH, 45432, USA

    A. L. Pilchak (Graduate Research Associate, Visiting Scientist, Research Scientist)

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  1. A. L. Pilchak
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Manuscript submitted July 13, 2010.

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Pilchak, A.L., Williams, J.C. The Effect of Friction Stir Processing on the Mechanical Properties of Investment Cast and Hot Isostatically Pressed Ti-6Al-4V. Metall Mater Trans A 42, 1630–1645 (2011). https://doi.org/10.1007/s11661-010-0547-1

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