Creep-fatigue damage and life evaluation for boiler header stub weldment

Takuya Ito, Isamu Nonaka, Hideo Umaki, Hidetaka Nishida, Shizuma Shintani

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

In order to clarify the creep-fatigue damage process and to evaluate the creep-fatigue life for boiler 2.25Cr-1Mo header stub welds, a series of creep-fatigue tests were performed on partial mock-up specimens of actual plant under simulated plant loading conditions. Creep voids and micro-cracks occurred along the weld toes at an early stage of life and grew to form many short cracks. These short cracks grew both on the surface and through the wall of the stub tube and later coalesced to form one crack. It was proved that there was a correlation between the maximum crack depth and life ratio and also that there was a correlation between the maximum crack depth and the maximum crack length on the surface. A life prediction method was proposed based on these two correlations.

Original languageEnglish
Pages (from-to)162-166
Number of pages5
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume52
Issue number2
DOIs
Publication statusPublished - 2003 Feb

Keywords

  • 2.25Cr-1Mo steel
  • Boiler
  • Creep-fatigue
  • Header stub
  • Life evaluation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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