Original scientific paper

https://doi.org/10.14256/JCE.816.2012

Hardness distribution over cross-section of grooved rails

Stjepan Lakušić ; veučilište u Zagrebu, Građevinski fakultet, Zavod za prometnice
Maja Ahac ; veučilište u Zagrebu, Građevinski fakultet, Zavod za prometnice

Abstract

Head hardened rails have been introduced In order to extend the rail-replacement cycles for Zagreb tram tracks. During their precurving, the rail cracking occurred. Hardness tests were performed and tensile strength was calculated to establish whether unusual mechanical properties of rail steel are responsible for the cracking. Tests have shown that hardness values, despite significant variation over the rail cross-section, are higher than the prescribed minimum. It is assumed that rail problems encountered may be due to changes in rail steel microstructure resulting from an increase in rail head hardness during its thermal treatment.

Keywords

grooved rails; rail head hardening; hardness measurements; tensile strength

Hrčak ID:

95144

URI

https://hrcak.srce.hr/95144

Publication date:

10.1.2013.

Article data in other languages: croatian

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