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Title
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Effect of plastic deformation on the carbon internal friction peak in austenitic steels
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Author
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Abstract
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| Experimental data on the effect of plastic deformation on the carbon internal friction peak in austenitic steels (Finkelshtein-Rosin peak) were analyzed and it was shown that the general trend is that the peak height increases whereas the peak temperature is rather stable, or decreases. To explain this effect a computer simulation of the temperature dependence of the internal friction was performed using a model crystal without a dislocation or containing one screw dislocation taking into account long-range C-C and C-Ni interactions and C-dislocation interactions. The C-dislocation interaction was calculated by the so-called "hybrid" method. It was shown that the elastic field around a dislocation enhances the asymmetry of the displacements of metal atoms neighbouring interstitial atoms and, thus, increases the height of the peak. On the other hand, the weak energy for carbon-dislocation interaction in the f.c.c. lattice does not lead to significant changes in carbon atom energies. Thus, the corresponding value of the activation energy for "diffusion under stress" of carbon atoms remains nearly the same as for the undeformed alloy. For the same reason, there is no additional internal friction peak in austenite, in contrast with the Snoek-Koester peak in ferrite. |
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Language
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English
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Source (journal)
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Physica status solidi: A: applied research. - Berlin
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Publication
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Berlin
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2000
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ISSN
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0031-8965
[print]
1521-396X
[online]
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DOI
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10.1002/1521-396X(200004)178:2<621::AID-PSSA621>3.3.CO;2-R
10.1002/1521-396X(200004)178:2<621::AID-PSSA621>3.0.CO;2-#
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Volume/pages
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178
:2
(2000)
, p. 621-632
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ISI
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000087029400002
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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