Patterns of the Formation of Reduced Hardness Zones in a Welded Joint of Railway Rails

The research investigates the structure of a welded joint of a railway rail after local heat treatment and without it. Macro- and microstructural analyses of rail samples were performed using optical microscopy methods. The hardness of the rail running surface in the heat-affected zone of butt welds...

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Bibliographic Details
Published in:Metal science and heat treatment 2022-09, Vol.64 (5-6), p.332-337
Main Authors: Shevchenko, R. A., Yur’ev, A. B., Kozyrev, N. A., Mikhno, A. R.
Format: Article
Language:English
Subjects:
Analysis
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Engineering Thermodynamics
Hardness
Heat affected zone
Heat and Mass Transfer
Heat treatment
Induction heating
Materials Science
Mechanical properties
Metallic Materials
Optical microscopy
Railroads
Welded joints
Welding
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Summary:The research investigates the structure of a welded joint of a railway rail after local heat treatment and without it. Macro- and microstructural analyses of rail samples were performed using optical microscopy methods. The hardness of the rail running surface in the heat-affected zone of butt welds was measured. It has been found that the formation of zones with reduced hardness is inevitable due to the temperature gradient created during the welding process. Moreover, using local induction heat treatment results in the formation of new, more extended zones with reduced hardness. It has been determined that the only solution to this problem is to reduce the extent of heat-affected zones to sizes that do not lead to increased wear and local crushing.
ISSN:0026-0673
1573-8973
DOI:10.1007/s11041-022-00810-0