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 Jul 15

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creep properties
austenitic stainless steels
Austenitic stainless steel
Precipitates
precipitates
Creep
creep strength
Creep resistance
Kinetics
Carbon nitride
Steel
kinetics
Temperature
steels
Thermodynamics
thermodynamics
simulation

Keywords

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

ASJC Scopus subject areas

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

Cite this

Effect of Nb and Cu on the high temperature creep properties of a high Mn-N austenitic stainless steel. / Lee, Kyu Ho; Suh, Jin Yoo; Huh, Joo Youl; Park, Dae Bum; Hong, Sung Min; Shim, Jae Hyeok; Jung, Woo Sang.

In: Materials Characterization, Vol. 83, 15.07.2013, p. 49-57.

Research output: Contribution to journalArticle

Lee, Kyu Ho ; Suh, Jin Yoo ; Huh, Joo Youl ; Park, Dae Bum ; Hong, Sung Min ; Shim, Jae Hyeok ; Jung, Woo Sang. / Effect of Nb and Cu on the high temperature creep properties of a high Mn-N austenitic stainless steel. In: Materials Characterization. 2013 ; Vol. 83. pp. 49-57.
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AU - Lee, Kyu Ho

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AU - Huh, Joo Youl

AU - Park, Dae Bum

AU - Hong, Sung Min

AU - Shim, Jae Hyeok

AU - Jung, Woo Sang

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N2 - 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.

AB - 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.

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