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Powder Metallurgy HIP Process Study and Mechanical Property Evaluations for IN740H

  • High Temperature Alloys: Manufacturing, Processing, and Repair
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A Correction to this article was published on 19 April 2023

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Abstract

The effects of hot isostatic pressing (HIP) parameters and powder size distribution (PSD) on the resulting microstructure and properties of powder metallurgy (P/M) IN740H have been investigated. Properties can be substantially tailored through the appropriate management of these parameters. Applying a thermal presoak to the input powder prior to the sintering stage of HIP can significantly increase average grain size and coarse grain fraction, enabling a trade for improved creep resistance at the expense of tensile strength. Powder thermal presoak was found to have a larger impact on microstructure and properties than the use of a coarser PSD alone. Additionally, substantial grain growth and grain boundary migration is observed in P/M IN740H at HIP temperatures above 1260°C. Given its inherently finer grain size, P/M HIP IN740H typically outperforms its cast and wrought counterparts in tensile response. Creep life at 700–800°C was inferior to wrought due to PPBs coincident with grain boundaries which served as cavity nucleation sites, leading to lower creep ductility. The ability to adjust the microstructure toward a more balanced creep and tensile behavior allows P/M HIP IN740H to be considered for high-temperature applications in advanced ultra-supercritical steam and supercritical carbon dioxide power cycles.

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Acknowledgements

This work was funded by US Department of Energy, Office of Fossil Energy, under Award Number DE-FE0031818 with Program Manager Vito Cedro. Yali Su and Chris Perlee at GE Research are acknowledged for LECO analysis and powder HIP preparation. Beth Lewis and Andrew Marshall at Wyman-Gordon are acknowledged for providing high quality IN740H powder. The authors would like to thank technical discussion and collaboration with Victor Samarov, Alex Bissikalov at Synertech PM Inc., Jack deBarbadillo at Special Metals, Jason Mortzheim at GE Research, and Alex Bridges at EPRI.

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Authors and Affiliations

  1. GE Research, Niskayuna, NY, 12309, USA

    Shenyan Huang, Timothy Hanlon, Ian Spinelli, Marija Drobnjak, Kevin Shoemaker & Cole Crawford

  2. Electric Power Research Institute, Charlotte, NC, 28262, USA

    John Shingledecker

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  1. Shenyan Huang
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  2. Timothy Hanlon
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Correspondence to Shenyan Huang.

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This article was updated to correct Fig. 5C.

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Huang, S., Hanlon, T., Shingledecker, J. et al. Powder Metallurgy HIP Process Study and Mechanical Property Evaluations for IN740H. JOM 74, 3289–3302 (2022). https://doi.org/10.1007/s11837-022-05385-y

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