In this study, the surface layer of a serviced rail used in a conventional line for 16 years was subjected to the crystallographic orientation analyses by means of inverse pole figure method at a macroscopic level and FESEM-EBSP method at a microscopic level. TEM observations of microstructures were also carried out. The followings were confirmed. A large part of crystals in the surface layer of the serviced rail arrayed their {111} crystallographic plane parallel to the rail surface and that the ratio of the arrayed crystals changed with the increase of the depth of measurement. Each crystallographic axis had own pattern of variation of axis density with the depth from the surface. It is important to construct a proper interpretation which can explain the individual pattern consistently. The EBSP measurement showed that the serviced rail consisted of small, relatively homogeneous size grains while there were also indistinct dark areas, whereas the new rail consisted of large grains with inhomogeneous sizes. It was considered based on the results obtained by means of EBSP that the repeated rolling contact of wheels on the rail surface gave rise to the fractionating of the constituent crystals, which were relatively large in the new rail into smaller, distorted ones with accumulated dislocations. It was shown in this study that it was very effective to apply the recently developed analysis method such as EBSP into the investigations of materials damaged by rolling contact.
Crystal orientation analysis of serviced rail with rolling contact fatigue damage
2003
7 Seiten, 12 Bilder, 2 Tabellen, 2 Quellen
Aufsatz (Konferenz)
Englisch
Crystal orientation analysis of serviced rail with rolling contact fatigue damage
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