Effect of Nb and Cu on the high temperature creep properties of a high Mn-N austenitic stainless steel
- Authors
- Lee, Kyu-Ho; Suh, Jin-Yoo; Huh, Joo-Youl; Park, Dae-Bum; Hong, Sung-Min; Shim, Jae-Hyeok; Jung, Woo-Sang
- Issue Date
- 9월-2013
- Publisher
- ELSEVIER SCIENCE INC
- Keywords
- High Mn-N austenitic steel; Creep strength; Precipitates; Z-phase; Cu particle; Coarsening
- Citation
- MATERIALS CHARACTERIZATION, v.83, pp.49 - 57
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS CHARACTERIZATION
- Volume
- 83
- Start Page
- 49
- End Page
- 57
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/102260
- DOI
- 10.1016/j.matchar.2013.05.015
- ISSN
- 1044-5803
- 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 degrees C. In the original high Mn-N steel, which was initially precipitate-free, the precipitation of M(23)G(6) = 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. (C) 2013 Elsevier Inc. All rights reserved.
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