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

Authors
Lee, Kyu-HoSuh, Jin-YooHuh, Joo-YoulPark, Dae-BumHong, Sung-MinShim, Jae-HyeokJung, Woo-Sang
Issue Date
2013-09
Publisher
ELSEVIER SCIENCE INC
Citation
MATERIALS CHARACTERIZATION, v.83, pp.49 - 57
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.
Keywords
HEAT-RESISTANT STEEL; STRENGTHENING MECHANISMS; CAVITATION; BEHAVIOR; MICROSTRUCTURE; DEFORMATION; STABILITY; ALLOY; PHASE; HEAT-RESISTANT STEEL; STRENGTHENING MECHANISMS; CAVITATION; BEHAVIOR; MICROSTRUCTURE; DEFORMATION; STABILITY; ALLOY; PHASE; High Mn-N austenitic steel; Creep strength; Precipitates; Z-phase; Cu particle; Coarsening
ISSN
1044-5803
URI
https://pubs.kist.re.kr/handle/201004/127719
DOI
10.1016/j.matchar.2013.05.015
Appears in Collections:
KIST Article > 2013
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