Microstructural evolution and creep-rupture life estimation of high-Cr martensitic heat-resistant steels

Kyu Ho Lee, Jin Yoo Suh, Sung Min Hong, Joo Youl Huh, Woo Sang Jung

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


The creep behavior of high-Cr martensitic heat-resistant steels was investigated to discuss the dominant factors determining the creep-rupture life in the temperature range from 839 to 894 K. Variation in the content of Nb, a carbide former, induced a difference in creep-degradation at the long-term creep condition, which was attributed to the formation of a Z-phase at the expense of M2N precipitates. Due to the continuous evolution of the microstructure during creep service, a simple form of the Monkman-Grant equation could not properly describe the creep-rupture life of the alloys; however, the modified Monkman-Grant equation, which incorporates the creep rate at the tertiary creep region, resulted in a reasonable estimation of creep-rupture life.

Original languageEnglish
Pages (from-to)266-272
Number of pages7
JournalMaterials Characterization
Publication statusPublished - 2015 Jun 22


  • Creep-rupture life
  • Heat-resistant steels
  • Monkman-Grant equation
  • Precipitation
  • Z-phase

ASJC Scopus subject areas

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


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