Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 487, Issue 1-2, Pages 108-113Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2007.10.007
Keywords
ultra-super-critical rotor steel; hot deformation; dynamic recovery and recrystallization; flow stress; Zener-Hollomon parameter
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The hot deformation behavior of a 12%Cr ultra-super-critical rotor steel was investigated through compression test using Gleeble-3500 thermal-mechanical simulator within the temperature range of 1173-1473K and the strain rate range of 0.01-10s(-1), and the corresponding flow curves were determined. The results showed that the flow stress and the peak strain increase with the drop in the deformation temperature and the rise in the strain rate. The critical Z value, below which the complete dynamic recrystallization may occur, is 3.53 x 10(17). The hot deformation activation energy of the steel is 439 kJ/mol, and the hot deformation equation is (epsilon) = 1.773 x 10(15)[sinh(alpha sigma(p))](4.420) exp (-439, 000/RT). For the convenience of the practical application, the regressed peak stress can be described as sigma(P) = 16.7 ln <(epsilon)over dot> + 881, 802/T - 507.3. (C) 2007 Elsevier B.V. All rights reserved.
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