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Kontaktné únavové poškozování v závislosti na strukturních variantách kolejnicových ocelí
Authors: Schmidová Eva
Year: 2006
Type of publication: kapitola v odborné knize
Name of source: Quality Engineering in Practice
Publisher name: Wydawnivtwo Menedzerskie PTM
Place: Varšava
Page from-to: 17-22
Titles:
Language Name Abstract Keywords
cze Kontaktné únavové poškozování v závislosti na strukturních variantách kolejnicových ocelí Příspěvek prezentuje současný stav vývoje nových kolejnicových materiálů. Předkládá výsledky analýz specifik degradačního mechanizmu vývojové bainitické lité oceli při srovnání se standardními kolejnicovými materiály, rovněž aktuální poznatky z ověřování v laboratorních i provozních podmínkách. bainitické oceli, provozní poškozování, metalurgie, metalografie
eng DEPENDENCE OF THE CONTACT-FATIGUE DAMAGE AT THE STRUCTURE TYPES OF THE RAILWAY STEELS In this article the readings have been evaluated primarily to analyse work loaded sections with the aim to define the actual degradation causing mechanism of the travel area ? for perlitic and bainitic railway steel. Purpose of the presented analysis was to put forward a meaningful picture of internal reaction of material, at a particular work load, on which typical signs of surface damage are noticed. Findings of actual degradation mechanism at macroscopic scale deriving from signs of wear at contact area, are directed towards prediction of service life in real conditions. Results of analysis performed on operational wear show in reality that the steel used leads to significant reduction of surface wear of rails; one of the consequences of suppressing abrasive elements of wear resulted in the fact that surface initiated contact fatigue has become significant. This report shows the difference between wear at the head of travel area of the rail and at its travel edge. Changes occur at the intensity of individual mechanisms ? reason being difference in intensity of contact pressure, impact load and extent of slide. bainitic steel, railway steels, rolling-contact fatigue, crossings, plastic deformation.

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