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

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

研究成果: Article査読

3 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)162-166
ページ数5
ジャーナルZairyo/Journal of the Society of Materials Science, Japan
52
2
DOI
出版ステータスPublished - 2003 2

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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