The characteristic of oxide scales on T91 tube after long-term service in an ultra-supercritical coal power plant

Xiangyu Zhong, Xinqiang Wu, En Hou Han

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

The characteristic of oxide scales on T91 superheater tube after long-term service in an ultra-supercritical coal power plant was investigated using light optical microscopy, stereomicroscope, X-ray diffraction, electron probe micro-analyzer, scanning electron microscopy and energy-dispersive X-ray spectroscopy. It was found that the oxide scale formed on the inner wall of the tube was a multi-layer structure. The outer layer consisted of Fe 3O4 and Fe2O3 with some pores and tended to exfoliate. The inner layer consisted of Cr-rich spinel. The Cr-rich oxide was observed as striations parallel to the oxide/metal interface. The possible mechanisms of oxidation and exfoliation are also discussed.

Original languageEnglish
Pages (from-to)68-77
Number of pages10
JournalJournal of Supercritical Fluids
Volume72
DOIs
Publication statusPublished - 2012 Dec
Externally publishedYes

Keywords

  • Ferritic-martensitic steel
  • High temperature corrosion
  • Oxide exfoliation
  • Supercritical coal power plant
  • Superheater
  • T91 tube

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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