2015 Volume 56 Issue 1 Pages 15-20
The crystallite size and dislocation density in RCF (rolling contact fatigue) affected layers have been identified using X-ray Fourier analyses on serviced rails. The evaluation of the crystallite size and dislocation density is based on modified Williamson-Hall and Warren-Averbach models. This evaluation enables quantification of the microstructure evolution in the RCF layer with the increase of accumulated loading (in terms of MGT - Million Gross Tonnes) as well as the identification of the most deteriorated locations in the RCF layer. In summary, the surface layer experiences the highest deterioration in the evaluated cases.