Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 303, Issue 1-2, Pages 150-157Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(00)01842-6
Keywords
cross-sectional transmission electron microscopy; white etching layers; X-ray diffraction
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Patches of white etching layers on rail surfaces were investigated using sophisticated techniques like cross-sectional transmission electron microscopy (XTEM) and synchroton X-ray diffraction. Optical microscopy failed to resolve the microstructure, but in the TEM submicron grains with high dislocation densities and occasional twins, which are characteristic features of high carbon martensite, were observed. The martensitic structure was confirmed by evaluation of synchroton X-ray diffraction line profiles. The latter technique also allowed to determine dislocation densities of the order of 10(12) cm(-2) and residual compressive stresses of about 200 MPa. (C) 2001 Elsevier Science B.V. All rights reserved.
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