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 journalArticle

16 Citations (Scopus)

Abstract

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 M<inf>2</inf>N 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
Volume106
DOIs
Publication statusPublished - 2015 Jun 22

Fingerprint

Steel
Microstructural evolution
Creep
steels
heat
carbides
precipitates
degradation
microstructure
temperature
Hot Temperature
Carbides
Precipitates
Degradation
Microstructure

Keywords

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

ASJC Scopus subject areas

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

Cite this

Microstructural evolution and creep-rupture life estimation of high-Cr martensitic heat-resistant steels. / Lee, Kyu Ho; Suh, Jin Yoo; Hong, Sung Min; Huh, Joo Youl; Jung, Woo Sang.

In: Materials Characterization, Vol. 106, 22.06.2015, p. 266-272.

Research output: Contribution to journalArticle

Lee, Kyu Ho ; Suh, Jin Yoo ; Hong, Sung Min ; Huh, Joo Youl ; Jung, Woo Sang. / Microstructural evolution and creep-rupture life estimation of high-Cr martensitic heat-resistant steels. In: Materials Characterization. 2015 ; Vol. 106. pp. 266-272.
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