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 journalArticlepeer-review

24 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 M2N precipitates during creep exposure.

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

Bibliographical note

Funding Information:
The authors gratefully acknowledge the financial support provided by the Korea Government Ministry of Knowledge Economy through the Korea Institute of Energy Technology Evaluation and Planning ( Grant No. 2012T100201597 ) and the Korea Institute of Science and Technology ( Grant No. 2E24692 ). The authors also thank Doosan Heavy Industries & Construction Co., Ltd. for providing the materials.

Keywords

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

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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