Abstract
AbstractThe modern understanding of the strength of bodies with cracks under statically and cyclically varying loads makes it possible to calculate the residual life of a structure, however, the specific conditions of deformation of a railway rail require the development of new methods for studying the initiation and development of fatigue cracks. herefore, the analysis of the laws of crack development is of great importance. Cracks begin to develop long before complete failure during fatigue, plastic, and even brittle failure. The duration of the destruction process, i.e. crack growth until complete destruction takes up a significant part of the “life” of the part, reaching 90% and more. The main thing during the operation of a part is not the presence of a crack, but the rate of its growth. In this work, a microstructural analysis of the cross-sectional surface of five rails with internal cracks, longitudinal and transverse, is carried out. Rail samples taken out of operation after many years of service. Fractographic analysis of the crack surface and the surrounding material indicates a significant degradation of the physical and mechanical properties of the rail steel.KeywordsRail steelMetallographyFatigue crackMetal microstructureFracture surface
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