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Formation of new phases and local high temperatures in nanoscaled areals during cyclic fracture of steel

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Author(s): L.A. Gorbachov | A.D. Pogrebnjak | О.S. Kuzema

Journal: Journal of Nano- and Electronic Physics
ISSN 2077-6772

Volume: 1;
Issue: 4;
Date: 2009;
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Keywords: LOW-CARBON STEEL | FATIGUE DEFORMATION | AUGER SPECTROSCOPY | INNER FRICTION | X-RAY STRUCTURE ANALYSIS | NANOHARDNESS

ABSTRACT
The first results allowing new understanding of physical processes occurring under fatigue deformation in low-carbon steels are reported. After every stage of fatigue deformation, samples were investigated using Auger electron spectroscopy, optical and scanning electron microscopy, atomic-force microscopy, measurements of internal friction, x-ray diffraction analysis (XRD), x-ray fluorescent analysis, measurements of nanohardness, and plotted fatigue kinetic curves. We found formation of “dark spots”, slip bands, and new phases as FeCO3 (iron carbonate), as well as iron oxalate C2FeO4. They seemed to be conditioned either by the process of cyclic friction occurring in slip planes of intensively deformed grains, which possibly resulted in separation of individual submicron structured metal particles, or by action of high temperatures arising in submicrovolume local regions, in which chemical reactions are initiated.
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