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Comparative Thermal Aging Effects on PM-HIP and Forged Inconel 690

  • Powder Metallurgy of Non-Ferrous Metals
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Abstract

This study compares thermal aging effects in Inconel 690 (IN690) produced by forging and powder metallurgy with hot isostatic pressing (PM-HIP). Isothermal aging is carried out over 400–800°C for up to 1000 h and then metallography and nanoindentation are utilized to relate grain microstructure with hardness and yield strength. The PM-HIP IN690 maintains a constant grain size through all aging conditions, while the forged IN690 exhibits limited grain growth at the highest aging temperature and longest aging time. The PM-HIP IN690 exhibits comparable mechanical integrity as the forged material throughout aging: hardness and yield strength are unchanged with 100 h aging, but increase after 1000 h aging at all temperatures. In both the PM-HIP and forged IN690, the Hall–Petch relationship for Ni-based superalloys predicts yield strength for 0–100 h aged specimens, but underestimates yield strength in the 1000 h aged specimens because of thermally induced precipitation.

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Acknowledgements

This work is supported by the US Department of Energy Office of Nuclear Energy, Nuclear Science User Facilities Project 15-8242. The authors also acknowledge in-kind support from the Electric Power Research Institute. AB and EB acknowledge support from the Purdue Summer Undergraduate Research Fellowship (SURF) and Network for Computational Nanotechnology (NCN) Programs.

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Authors and Affiliations

  1. School of Nuclear Engineering, Purdue University, 400 Central Drive, West Lafayette, IN, 47907, USA

    Alexander L. Bullens, Elizabeth H. Jaye, Nathaniel L. Vas & Janelle P. Wharry

  2. Department of Chemistry and Biochemistry, California State University – Northridge, 18111 Nordhoff Street, Northridge, CA, 91330, USA

    Esteban Bautista

  3. School of Materials Engineering, Purdue University, 701 West Stadium Avenue, West Lafayette, IN, 47907, USA

    Nathan B. Cain & Keyou Mao

  4. Electric Power Research Institute, 1300 West WT Harris Boulevard, Charlotte, NC, 28262, USA

    David W. Gandy

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  1. Alexander L. Bullens
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  2. Esteban Bautista
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  8. Janelle P. Wharry
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Correspondence to Janelle P. Wharry.

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Bullens, A.L., Bautista, E., Jaye, E.H. et al. Comparative Thermal Aging Effects on PM-HIP and Forged Inconel 690. JOM 70, 2218–2223 (2018). https://doi.org/10.1007/s11837-018-2818-z

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  • DOI: https://doi.org/10.1007/s11837-018-2818-z

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