Publication detail

Study of Structural Heterogenity on Railway Wheel in Connection with Operational Degradation

Authors: Švanda Pavel | Beneš Libor | Schmidová Eva

Year: 2006

Type of publication: ostatní - přednáška nebo poster

Name of source: Proceedings of 23rd International Colloquium

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Titles:

Language	Name	Abstract	Keywords
cze	Strukturní nehomogenity železnich kol ve vztahu k provoznímu opotřebení	Byl studován vztah mezi strukturními změnami jízní plochy železničních kol v souvlislosti s provozním opotřebením. Vyhoznocení na základě měření profilu mikrotvrdostí a metalografických analýz.	phase structure;metallography;wheel treads
eng	Study of Structural Heterogenity on Railway Wheel in Connection with Operational Degradation	Due to extreme forces application on the tread surface, crystalic grains are distorted and crushed. This surface changes induce microcracking, that can concentrate stress and accelerate damage. Obtained results show considerable deformation of surface layers (up to approx. 5 mm) as well as initialization of cracks. Microhardness (HV 0.5) proved marked strain hardening up to depth of several tenths of millimeters. Our study characterized two basic mechanisms of cracking formation - thermal initialization and contact-fatigue damage. These two mechanisms can generate different structures, but both contribute to irreversible degradation on the surface of railways wheels.	phase structure;metallography;wheel treads

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