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Título: | Superplastic Behavior of Fe-8.0 mass%Al-2.0 mass%Cr-1.3 mass%C Alloy |
Autor: | Hernández, D.; Jiménez, José Antonio CSIC ORCID ; Frommeyer, G. | Palabras clave: | Superplasticity Ultra-high carbon steels Thermomechanical process Fine grained microstructure Grain boundary sliding Slip creep |
Fecha de publicación: | 1996 | Editor: | Japan Institute of Metals | Citación: | Materials Transactions - JIM 37(12) : 1758-1762 (1996) | Resumen: | An ultra high carbon steel containing 8.0 mass%Al-2.0 mass%Cr-1.3 mass%C was processed to obtain a fine grained microstructure and superplastic behavior. Thermomechanical processing consists of warm rolling from 1373 to 1023 K (η≈90%) and then continuous rolling (η≈25%) around the Ac1 transformation temperature. The final microstructure consists of a bimodal distribution of large proeutectoid and small κ-carbides in a ferritic matrix with a grain size of about 7 µm. Two different stress exponent regimes in the temperature range from 1023 to 1193 K as a function of the strain rate have been found. At strain rates up to ≈5×10m3s-1, the alloy was superplastic with stress exponents, n, of about 2 and tensile elongations as high as 865% at 1153 K. The plastic flow data in this regimen are in agreement with grain boundary sliding creep model. As the applied stress is increased, the stress exponent increased to about 4-5. The creep behavior is explained in this regimen by a single dislocation climb mechanism. The activation energy for creep is in both regimens comparable with that for lattice diffusion of Fe in ferrite. | Versión del editor: | http://www.jim.or.jp/journal/e/37/12/1758.html | URI: | http://hdl.handle.net/10261/56759 | ISSN: | 1345-9678 | E-ISSN: | 1347-5320 |
Aparece en las colecciones: | (CENIM) Artículos |
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