Study on creep damage assessment method for mod. 9Cr-1Mo steel by sampling creep testing with thin plate specimen

Hideyuki Kanayama, Noritake Hiyoshi, Fumio Ogawa, Mie Kawabata, Takamoto Itoh, Takashi Wakai

Research output: Contribution to journalArticlepeer-review

Abstract

This study presents creep damage assessment method for Mod. 9Cr-1Mo steel by sampling creep testing with thin plate specimen. Tensile creep rupture tests were performed using three different sizes of specimen under two different test environments to verify the creep testing with the thin plate specimen. Time to rupture of Mod. 9Cr-1Mo steel using three different sizes were almost same. In addition, there was no effect of environment on time to rupture. Pre-damaged thin plate specimens were machined from a bulk specimen's gage section that pre-damage test was performed with. Predamage based on life fraction rule were 8%, 16% and 25%. No effect of the process of machining pre-damaged specimen on time to rupture was confirmed by verification tests in same test condition as pre-damage test. Stress acceleration creep rupture tests were performed to estimate creep damage assessment. Creep damage assessment by stress acceleration creep rupture tests was sufficiently accurate estimate. Creep damage assessments by Vickers hardness and lath width were compared with the assessment by stress acceleration creep rupture tests to study applicability of these methods.

Original languageEnglish
Pages (from-to)421-428
Number of pages8
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume68
Issue number5
DOIs
Publication statusPublished - 2019 May
Externally publishedYes

Keywords

  • Creep
  • Creep damage assessment
  • Miniature specimen
  • Mod. 9cr-1mo steel
  • Sample testing

ASJC Scopus subject areas

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

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