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High-temperature creep behavior and microstructural evolution of an 18Cr9Ni3CuNbVN austenitic stainless steel
- Authors
- Park, Dae-Bum; Hong, Sung-Min; Lee, Kyu-Ho; Huh, Moo-Young; Suh, Jin-Yoo; Lee, Seung-Cheol; Jung, Woo-Sang
- Issue Date
- 7월-2014
- Publisher
- ELSEVIER SCIENCE INC
- Keywords
- Austenitic stainless steel; Creep strength; Z-phase; Cu precipitates
- Citation
- MATERIALS CHARACTERIZATION, v.93, pp.52 - 61
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS CHARACTERIZATION
- Volume
- 93
- Start Page
- 52
- End Page
- 61
- ISSN
- 1044-5803
- 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. (C) 2014 Elsevier Inc. All rights reserved.
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