High-temperature creep behavior and microstructural evolution of an 18Cr9Ni3CuNbVN austenitic stainless steel

Dae Bum Park; Sung Min Hong; Kyu Ho Lee; Moo Young Huh; Jin Yoo Suh; Seung Cheol Lee; Woo Sang Jung

doi:10.1016/j.matchar.2014.03.012

High-temperature creep behavior and microstructural evolution of an 18Cr9Ni3CuNbVN austenitic stainless steel

Dae Bum Park, Sung Min Hong, Kyu Ho Lee, Moo Young Huh, Jin Yoo Suh, Seung Cheol Lee, Woo Sang Jung

Honorary professors

Research output: Contribution to journal › Article

30 Citations (Scopus)

Abstract

The creep properties of an 18Cr9Ni3CuNbVN austenitic stainless steel have been investigated at temperatures ranging from 923 to 1073 K and stresses from 120 to 250 MPa. The rupture lives ranged from 10 to 20,105 h. The stress dependence of the minimum creep rate obeyed a power law, with stress exponents ranging from 6 to 8.6. The activation energy was determined to be 460 to 485 kJ/mol/K. The microstructural evolution during the creep test was investigated. The V-rich Z-phase and metallic Cu precipitates began to precipitate in the middle of the creep deformation, resulting in an increase of the creep strength, while only Nb-based MX precipitates were present from the beginning of the high-temperature creep test.

Original language	English
Pages (from-to)	52-61
Number of pages	10
Journal	Materials Characterization
Volume	93
DOIs	https://doi.org/10.1016/j.matchar.2014.03.012
Publication status	Published - 2014 Jul

Keywords

Austenitic stainless steel
Creep strength
Cu precipitates
Z-phase

ASJC Scopus subject areas

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

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Park, D. B., Hong, S. M., Lee, K. H., Huh, M. Y., Suh, J. Y., Lee, S. C., & Jung, W. S. (2014). High-temperature creep behavior and microstructural evolution of an 18Cr9Ni3CuNbVN austenitic stainless steel. Materials Characterization, 93, 52-61. https://doi.org/10.1016/j.matchar.2014.03.012

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title = "High-temperature creep behavior and microstructural evolution of an 18Cr9Ni3CuNbVN austenitic stainless steel",

abstract = "The creep properties of an 18Cr9Ni3CuNbVN austenitic stainless steel have been investigated at temperatures ranging from 923 to 1073 K and stresses from 120 to 250 MPa. The rupture lives ranged from 10 to 20,105 h. The stress dependence of the minimum creep rate obeyed a power law, with stress exponents ranging from 6 to 8.6. The activation energy was determined to be 460 to 485 kJ/mol/K. The microstructural evolution during the creep test was investigated. The V-rich Z-phase and metallic Cu precipitates began to precipitate in the middle of the creep deformation, resulting in an increase of the creep strength, while only Nb-based MX precipitates were present from the beginning of the high-temperature creep test.",

keywords = "Austenitic stainless steel, Creep strength, Cu precipitates, Z-phase",

author = "Park, {Dae Bum} and Hong, {Sung Min} and Lee, {Kyu Ho} and Huh, {Moo Young} and Suh, {Jin Yoo} and Lee, {Seung Cheol} and Jung, {Woo Sang}",

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AU - Park, Dae Bum

AU - Hong, Sung Min

AU - Lee, Kyu Ho

AU - Huh, Moo Young

AU - Suh, Jin Yoo

AU - Lee, Seung Cheol

AU - Jung, Woo Sang

PY - 2014/7

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N2 - The creep properties of an 18Cr9Ni3CuNbVN austenitic stainless steel have been investigated at temperatures ranging from 923 to 1073 K and stresses from 120 to 250 MPa. The rupture lives ranged from 10 to 20,105 h. The stress dependence of the minimum creep rate obeyed a power law, with stress exponents ranging from 6 to 8.6. The activation energy was determined to be 460 to 485 kJ/mol/K. The microstructural evolution during the creep test was investigated. The V-rich Z-phase and metallic Cu precipitates began to precipitate in the middle of the creep deformation, resulting in an increase of the creep strength, while only Nb-based MX precipitates were present from the beginning of the high-temperature creep test.

AB - The creep properties of an 18Cr9Ni3CuNbVN austenitic stainless steel have been investigated at temperatures ranging from 923 to 1073 K and stresses from 120 to 250 MPa. The rupture lives ranged from 10 to 20,105 h. The stress dependence of the minimum creep rate obeyed a power law, with stress exponents ranging from 6 to 8.6. The activation energy was determined to be 460 to 485 kJ/mol/K. The microstructural evolution during the creep test was investigated. The V-rich Z-phase and metallic Cu precipitates began to precipitate in the middle of the creep deformation, resulting in an increase of the creep strength, while only Nb-based MX precipitates were present from the beginning of the high-temperature creep test.

KW - Austenitic stainless steel

KW - Creep strength

KW - Cu precipitates

KW - Z-phase

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