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The Effect of Forging Variables on the Supersolvus Heat-Treatment Response of Powder-Metallurgy Nickel-Base Superalloys

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Abstract

The effect of subsolvus forging temperature and strain rate on the grain size developed during final supersolvus heat treatment (SSHT) of two powder-metallurgy, gamma–gamma prime superalloys, IN-100 and LSHR, was established. For this purpose, isothermal, hot compression tests were performed at temperatures ranging from 1144 K (871 °C) and 22 K (22 °C) below the respective gamma-prime solvus temperatures (T γ′) and strain rates between 0.0003 and 10 s−1. Deformed samples were then heat treated 20 K (20 °C) above the solvus for 1 h with selected additional samples exposed for shorter and longer times. For both alloys, the grain size developed during SSHT was in the range of 15 to 30 μm, except for those processing conditions consisting of pre-deformation at the highest temperature, i.e., T γ′—22 K (T γ′—22 °C), and strain rates in the range of ~0.001 to 0.1 s−1. In these latter instances, the heat-treated grain size was approx. four times as large. The observations were interpreted in terms of the mechanisms of deformation during hot working and their effect on the driving forces for grain-boundary migration which controls the evolution of the gamma-grain size.

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Notes

  1. Compressive strains, strain rates, and stresses are reported as positive quantities here and throughout the balance of this work.

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Acknowledgments

This work was conducted as part of the in-house research of the Metals Branch of the Air Force Research Laboratory’s Materials and Manufacturing Directorate. The support and encouragement of the Laboratory management are gratefully acknowledged. The authors thank P.N. Fagin and T.M. Brown for their yeoman service in conducting the experiments. Technical discussions with T.P. Gabb, A.D. Rollett, and E.J. Payton are also much appreciated. Three of the authors were supported under the auspices of contracts FA8650-08-D-5200 (JMS, ARS) and FA8650-09-2-5800 (WMS).

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Authors and Affiliations

  1. Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RXCM, Wright-Patterson Air Force Base, OH, 45433-7817, USA

    S. L. Semiatin (Senior Scientist, Materials Processing/Processing Science) & A. L. Pilchak (Research Leader, Metallic Materials and Processes)

  2. UES, Inc., 4401 Dayton-Xenia Road, Dayton, OH, 45432, USA

    J. M. Shank (Technician) & A. R. Shiveley (Research Scientist)

  3. Department of Mechanical and Aerospace Engineering, University of Dayton, 300 College Park, Dayton, OH, 45409, USA

    W. M. Saurber (Undergraduate Student) & E. F. Gaussa (Undergraduate Student)

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  1. S. L. Semiatin
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  2. J. M. Shank
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  3. A. R. Shiveley
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  4. W. M. Saurber
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  6. A. L. Pilchak
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Correspondence to S. L. Semiatin.

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Manuscript submitted March 7, 2014.

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Semiatin, S.L., Shank, J.M., Shiveley, A.R. et al. The Effect of Forging Variables on the Supersolvus Heat-Treatment Response of Powder-Metallurgy Nickel-Base Superalloys. Metall Mater Trans A 45, 6231–6251 (2014). https://doi.org/10.1007/s11661-014-2572-y

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