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In situ X-ray diffraction on bearing steel under rolling contact fatigue conditions
2002 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

When a bearing steel is under rolling contact fatigue conditions, characterised by certain contact pressure and temperature, material decay will occur. This decay can be measured in various ways. One manifestation of the material decay is the change in the width of a specific diffraction peak. For a few years, SKF has investigated how the line width and material decay change for the subsurface material with increasing numbers of revolutions. A model, the Thermo Mechanical Response model, has been developed by J. Slycke to predict the behavior and relate it to the remaining life of a bearing. To get a complete picture of the material behavior of the bearing, surface material fatigue observation has been started in SKF-ERC. So far the results are very promising but there is still a lot of investigations left to do. In this thesis smooth and pre-damaged surfaces under rolling contact fatigue conditions have been observed and investigated. This investigation has been carried out with a combined two-disc test rig and a D5000 diffractometer. Surface measurements were performed before and after the test to characterize and calculate the surface roughness. During testing with the two-disc test rig several diffraction line width profile measurements and residual stress measurements were preformed with the D5000, in order to see their evolution in function of increasing numbers of revolutions. The result obtained is compared with the TMR-model for the subsurface.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Rolling contact fatigue, bearings, surfaces fatigue, x-ray
Keyword [sv]
URN: urn:nbn:se:ltu:diva-59437ISRN: LTU-EX--02/275--SELocal ID: ff60560e-0cca-492f-ae46-2b600df742e0OAI: diva2:1032825
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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