Creep-fatigue life evaluation for weldments of modified 9Cr-1Mo steel at boiler temperatures

Isamu Nonaka, Shoji Torihata, Shigemitu Kihara, Hideo Umaki

Research output: Contribution to journalReview articlepeer-review

12 Citations (Scopus)

Abstract

Creep-fatigue tests were conducted to verify long-term structural integrity for weldments of modified 9Cr-1Mo steel at boiler plants. As a result, it was proved that the weldments were fractured mainly at the HAZ and the fatigue lives were reduced by strain hold. This appeared to be due to acceleration of crack initiation by creep strain concentration and acceleration of crack growth by void generation in the HAZ. A method for predicting the life is proposed based on the fracture mechanism, and its accuracy was confirmed to be within a factor of two.

Original languageEnglish
Pages (from-to)69-73
Number of pages5
JournalMaterials at High Temperatures
Volume15
Issue number2
DOIs
Publication statusPublished - 1998 Jan 1

Keywords

  • Modified 9Cr-1Mo steel

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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