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

Karen Pantleon, Melanie Montgomery

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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.
Original languageEnglish
JournalMetallurgical and Materials Transactions A - Physical Metallurgy and Materials Science
Volume43A
Issue number5
Pages (from-to)1477-1486
ISSN1073-5623
DOIs
Publication statusPublished - 2012
EventNeutron and X-Ray Studies of Advanced Materials IV. 2011 TMS Annual Meeting & Exhibition - San Diego, CA, United States
Duration: 27 Feb 20113 Mar 2011

Conference

ConferenceNeutron and X-Ray Studies of Advanced Materials IV. 2011 TMS Annual Meeting & Exhibition
CountryUnited States
CitySan Diego, CA
Period27/02/201103/03/2011

Keywords

  • MATERIALS
  • METALLURGY
  • OXIDATION-KINETICS
  • FERRITIC STEELS
  • WATER-VAPOR
  • POWER-PLANT
  • TEMPERATURE
  • BEHAVIOR
  • GROWTH
  • STRAIN
  • MICROSTRUCTURE
  • DISTRIBUTIONS

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