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Phase Identification and Internal Stress Analysis of Steamside Oxides on Plant Exposed Superheater Tubes

  • Symposium: Neutron and X-Ray Studies of Advanced Materials IV
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Abstract

During long-term, high-temperature exposure of superheater tubes in thermal power plants, various oxides are formed on the inner side (steamside) of the tubes, and oxide spallation is a serious problem for the power plant industry. Most often, oxidation in a steam atmosphere is investigated in laboratory experiments just mimicking the actual conditions in the power plant for simplified samples. On real plant-exposed superheater tubes, the steamside oxides are solely investigated microscopically. The feasibility of X-ray diffraction for the characterization of steamside oxidation on real plant-exposed superheater tubes was proven in the current work; the challenges for depth-resolved phase analysis and phase-specific residual stress analysis at the inner side of the tubes with concave surface curvature are discussed. Essential differences between the steamside oxides formed on two different steels typically applied for superheaters, ferritic-martensitic X20CrMoV12-1 and lean austenitic stainless steel TP347H, respectively, are revealed by X-ray diffraction.

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Acknowledgment

The authors thank Värmeforsk (Thermal Engineering Research Association) Sweden, for financial support (project M4-312).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Technical University of Denmark, Kemitorvet, Building 204, DK-2800, Kgs. Lyngby, Denmark

    Karen Pantleon (Associate Professor) & Melanie Montgomery (Senior Scientist)

  2. Vattenfall A/S, Thermal Engineering Denmark, Stoeberigade 14, 2450, Copenhagen, Denmark

    Melanie Montgomery (Senior Scientist)

Authors
  1. Karen Pantleon
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  2. Melanie Montgomery
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Correspondence to Karen Pantleon.

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Manuscript submitted June 21, 2011.

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Pantleon, K., Montgomery, M. Phase Identification and Internal Stress Analysis of Steamside Oxides on Plant Exposed Superheater Tubes. Metall Mater Trans A 43, 1477–1486 (2012). https://doi.org/10.1007/s11661-011-0874-x

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  • DOI: https://doi.org/10.1007/s11661-011-0874-x

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