Effect of Nb and Cu on the high temperature creep properties of a high Mn-N austenitic stainless steel

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

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The effect of Nb and Cu addition on the creep properties of a high Mn-N austenitic stainless steel was investigated at 600 and 650 C. In the original high Mn-N steel, which was initially precipitate-free, the precipitation of M23C6 (M = Cr, Fe) and Cr2N took place mostly on grain boudaries during creep deformation. On the other hand, the minor addition of Nb resulted in high number density of Z-phases (CrNbN) and MX (M = Nb; X = C, N) carbonitrides inside grains by combining with a high content of N, while suppressing the formation of Cr2N. The addition of Cu gave rise to the independent precipitation of nanometer-sized metallic Cu particles. The combination of the different precipitate-forming mechanisms associated with Z-phase, MX and Cu-rich precipitates turned out to improve the creep-resistance significantly. The thermodynamics and kinetics of the precipitation were discussed using thermo-kinetic simulations.

Original languageEnglish
Pages (from-to)49-57
Number of pages9
JournalMaterials Characterization
Volume83
DOIs
Publication statusPublished - 2013

Keywords

  • Coarsening
  • Creep strength
  • Cu particle
  • High Mn-N austenitic steel
  • Precipitates
  • Z-phase

ASJC Scopus subject areas

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

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