Near-Net-Shape HIP Manufacturing for sCO2 Turbomachinery Cost Reduction

Near-Net-Shape HIP Manufacturing for sCO2 Turbomachinery Cost Reduction

Shenyan Huang, Victor Samarov, Dmitry Seliverstov, Jason Mortzheim, Evgeny Khomyakov

Abstract. sCO2 turbomachinery that operates above 650°C requires the use of γ′ strengthened Ni-based superalloys, leading to high cost and barrier of market adoption. Near-net-shape (NNS) HIP manufacturing with 282® alloy powder is being developed for sCO2 turbine components, with a significant estimated cost reduction. Tensile, creep, low cycle fatigue properties of argon gas atomized and plasma atomized powders were evaluated and compared to sand cast HAYNES® 282®. While tensile strength and fatigue life outperformed sand cast material, a 10~25% debit in the creep stress capability was observed due to the fine grain size and presence of prior particle boundaries (PPBs). Finite element model calibrated by powder rheological properties accurately predicted the nonuniform shrinkage during HIP, providing HIP tooling design to achieve the target dimension. A 20 lbs. turbine nozzle ring was successfully demonstrated within 0.01 inch dimensional tolerance at the vanes. A 1700lbs. turbine casing with complex internal struts and manifolds was also demonstrated being close to the target dimension.

Keywords
Near-Net-Shape HIP, Superalloy, sCO2 Turbomachinery, Mechanical Property

Published online 12/8/2023, 6 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: Shenyan Huang, Victor Samarov, Dmitry Seliverstov, Jason Mortzheim, Evgeny Khomyakov, Near-Net-Shape HIP Manufacturing for sCO2 Turbomachinery Cost Reduction, Materials Research Proceedings, Vol. 38, pp 11-16, 2023

DOI: https://doi.org/10.21741/9781644902837-2

The article was published as article 2 of the book Hot Isostatic Pressing

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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