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Alpha/Beta Heat Treatment of a Titanium Alloy with a Nonuniform Microstructure

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The effect of alpha/beta solution temperature and cooling rate on the evolution of microstructure during the heat treatment of Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti6242Si) with a partially spheroidized starting microstructure of equiaxed + remnant lamellar alpha was established. Experiments comprising induction heating to a peak temperature of 971 °C or 982 °C followed by cooling at a rate of 11 °C/min or 42 °C/min revealed that the volume fraction of the equiaxed alpha grew much more rapidly than the lamellar constituent. These results were explained semiquantitatively using simple diffusion analyses of the growth of either spherical or elliptical particles, taking into account the soft impingement of the concentration fields. Despite the much lower diffusivity of molybdenum, which appears to control the growth of primary alpha in Ti6242Si, the similarity of the overall kinetics compared to those measured previously for Ti-6Al-4V was explained on the basis of the higher supersaturations developed during cooldown in the present alloy.

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Notes

  1. FoveaPro is a trademark of Reindeer Games, Asheville, North Carolina, USA.

  2. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

  3. Model calculations based on the diffusional thickening of a semi-infinite plate[13] were also performed, but yielded predictions inferior to those from the ellipsoidal-particle analysis.

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ACKNOWLEDGMENTS

This work was conducted as part of the in-house research of the Metals Processing Group of the Air Force Research Laboratory’s Materials and Manufacturing Directorate. The support and encouragement of the laboratory management and the Air Force Office of Scientific Research (Dr. J.S. Tiley, program manager) are gratefully acknowledged. The project effort was also partly supported by the Air Force Metals Affordability Initiative program on Microstructure and Mechanical Property Modeling for Wrought Titanium Alloys being led by Ladish Company (Cudahy, WI). Two of the authors were supported under the auspices of Contract Nos. F33615-02-2-5800 (TML) and F33615-99-2-5215, Project No. LAD-2 (DUF). The assistance of P. Fagin, T. Brown, and T. Goff in conducting the experiments is gratefully acknowledged.

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Authors and Affiliations

  1. Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/MLLM, Wright-Patterson Air Force Base, Ohio, OH, 45433, USA

    S. L. Semiatin (Senior Scientist) & J. D. Miller (Materials Research Engineer)

  2. Department of Mechanical Engineering, University of Dayton, Dayton, OH, 45409, USA

    T. M. Lehner (Undergraduate Student)

  3. Department of Materials Science and Engineering, Drexel University, Philadelphia, PA, 19104, USA

    R. D. Doherty (A.W. Grosvenor Professor of Materials Engineering)

  4. Rolls-Royce Corporation, Indianapolis, IN, 46206, USA

    D. U. Furrer (Senior Staff Specialist)

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  1. S. L. Semiatin
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  2. T. M. Lehner
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  3. J. D. Miller
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  4. R. D. Doherty
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  5. D. U. Furrer
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Correspondence to S. L. Semiatin.

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Manuscript submitted August 8, 2006.

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Semiatin, S.L., Lehner, T.M., Miller, J.D. et al. Alpha/Beta Heat Treatment of a Titanium Alloy with a Nonuniform Microstructure. Metall Mater Trans A 38, 910–921 (2007). https://doi.org/10.1007/s11661-007-9088-7

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