Effect of Nb addition on Z-phase formation and creep strength in high-Cr martensitic heat-resistant steels

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

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The effect of Nb addition on the creep strength of high-Cr martensitic heat-resistant steel was investigated at temperatures ranging from 839 to 894 K. The short-term creep properties were improved by Nb addition due to the enhanced MX precipitation. However, Nb addition deteriorated the steel's long-term stability resulting in an even shorter creep-rupture life than the original alloy. Onset of the accelerated degradation in Nb-containing steel was attributed to the gradual formation of Z-phase at the expense of M<inf>2</inf>N precipitates during creep exposure.

Original languageEnglish
Pages (from-to)79-84
Number of pages6
JournalMaterials Characterization
Volume102
DOIs
Publication statusPublished - 2015 Apr 1

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creep strength
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Keywords

  • Creep strength
  • Heat-resistant steels
  • Precipitation
  • XRD
  • Z-phase

ASJC Scopus subject areas

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

Cite this

Effect of Nb addition on Z-phase formation and creep strength in high-Cr martensitic heat-resistant steels. / Lee, Kyu Ho; Hong, Sung Min; Shim, Jae Hyeok; Suh, Jin Yoo; Huh, Joo Youl; Jung, Woo Sang.

In: Materials Characterization, Vol. 102, 01.04.2015, p. 79-84.

Research output: Contribution to journalArticle

Lee, Kyu Ho ; Hong, Sung Min ; Shim, Jae Hyeok ; Suh, Jin Yoo ; Huh, Joo Youl ; Jung, Woo Sang. / Effect of Nb addition on Z-phase formation and creep strength in high-Cr martensitic heat-resistant steels. In: Materials Characterization. 2015 ; Vol. 102. pp. 79-84.
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