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Mechanical properties and fatigue behavior of railway wheel steels as influenced by mechanical and thermal loadings
Chalmers University of Technology.ORCID iD: 0000-0001-5140-9074
Chalmers University of Technology.
Chalmers University of Technology.
2015 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, no 366-367, p. 407-415Article in journal (Other academic) Published
Abstract [en]

In the current work the deterioration of mechanical properties of railway wheel steels (UIC ER7T and ER8T) is in focus. These are medium carbon steels (∼0.55 wt.% C) heat treated to a near pearlitic microstructure with some 5-10% pro-eutectoid ferrite. During operation of trains, high thermal loads are evolved because of recurring acceleration, braking, curving and occasional slippage. It is thus relevant to examine the high temperature performance of wheel material and evaluate the decrease in strength after thermal exposure as well as the degradation of fatigue properties. Samples were extracted from virgin wheels and pre-strained to around 6.5% strain as well as cyclically deformed, to also account for the change in properties that is induced by plastic deformation inherent in the wheel tread surface. Both un-deformed and pre-strained material was heat treated for different times in the temperature range of interest, from 250°C to 600-700°C. Hardening was observed in both conditions around 300°C followed by softening at higher temperatures. Spheroidization of the pearlite started to become visible at 450°C for the un-deformed material and at around 400°C for the pre-strained.

Place, publisher, year, edition, pages
Elsevier, 2015. no 366-367, p. 407-415
Keywords [en]
Low cycle fatigue, LCFHardness, Thermal effects, Steel, Railway wheels
National Category
Materials Engineering
Research subject
Materials Engineering
Identifiers
URN: urn:nbn:se:kau:diva-86885DOI: 10.1016/j.wear.2016.04.009Scopus ID: 2-s2.0-84964701623OAI: oai:DiVA.org:kau-86885DiVA, id: diva2:1608845
Available from: 2021-11-04 Created: 2021-11-04 Last updated: 2021-11-09Bibliographically approved

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Dimitrios, Nikas

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