Effect of specimen size and oxygen partial pressure on creep characteristics for Mod. 9Cr-1Mo steel

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

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


This study presents creep characteristics of Mod. 9Cr-1Mo steel with various sized specimens and environment. Tensile creep tests were performed using three different sizes of specimen and three different types of testing environment. Creep specimens are a bulk specimen which has φ 6mm and 30mm in gage length, a miniature specimen which has φ 2mm and 10mm in gage length and a thin plate specimen which has 0.76mm in thickness, 1.5mm in width and 7.62mm in gage length. Three different types of testing environment are air, 99.99% Ar gas and vacuum. In the same environmental condition, there was no effect of specimen size on time to rupture. Time to rupture of Mod. 9Cr-1Mo steel in Ar gas was shorter than that in air and vacuum. Oxide thickness is not dominant factor in time to rupture. Fracture mode at specimen surface in Ar gas might be dominant factor in shorter time to rupture. Effect of specimen size and environment on creep strength of Mod. 9Cr-1Mo steel was evaluated on the basis of thinning effect.

Original languageEnglish
Pages (from-to)86-92
Number of pages7
JournalZairyo/Journal of the Society of Materials Science, Japan
Issue number2
Publication statusPublished - 2017 Feb
Externally publishedYes


  • Creep
  • Effect of oxygen
  • Effect of specimen size
  • Miniature specimen
  • Mod. 9Cr-1Mo steel
  • Partial pressure

ASJC Scopus subject areas

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


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