Effect of vanadium addition on the creep resistance of 18Cr9Ni3CuNbN austenitic stainless heat resistant steel

Dae Bum Park, Moo Young Huh, Woo Sang Jung, Jin Yoo Suh, Jae Hyeok Shim, Seung Cheol Lee

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The effect of vanadium addition on the creep property of niobium-containing 18Cr-9Ni austenitic heat-resistant steel was studied. After solution treatment, the MX precipitates of vanadium-free steel contained Nb only. On the contrary, high Nb and low V contents were detected from the MX precipitates in the steel with 0.3 wt% of vanadium. Vanadium-rich MX carbo-nitride was not observed in the matrix and at the grain boundaries after solution treatment. The vanadium precipitated as a form of Z-phase during early-stage creep deformation was attributed to the improvement in creep strength at 700 °C with applied stress higher than 150 MPa. And metallic Cu precipitates were confirmed in the nanometer scale using TEM and EDS technique. The Cu precipitates are believed to contribute to the strengthening of austenitic heat resistant steel independently. The precipitation behavior is discussed using transmission electron microscopy and thermo-kinetics simulation technique.

Original languageEnglish
Pages (from-to)532-538
Number of pages7
JournalJournal of Alloys and Compounds
Volume574
DOIs
Publication statusPublished - 2013

Keywords

  • Austenitic stainless steel
  • Creep strength
  • Z-phase

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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