Microstructural and Mechanical Characterization of Postweld Heat-Treated Thermite Weld in Rails

This paper describes a comparative study of the hardness characteristics, mechanical properties, microstructures, and fracture mechanisms of the thermite welded rail steel joints before and after heat treatment. It has been found that heat treatment of the welded joint improves the mechanical proper...

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Bibliographic Details
Published in:Materials characterization 1999-10, Vol.43 (4), p.243-250
Main Authors: Ilić, Nenad, Jovanović, Milan T, Todorović, Miša, Trtanj, Milan, Šaponjić, Petar
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
Exact sciences and technology
Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure
Fatigue, embrittlement, and fracture
FERRITE
HEAT TREATMENTS
INCLUSIONS
MATERIALS SCIENCE
MECHANICAL PROPERTIES
Metals. Metallurgy
MICROSTRUCTURE
PEARLITE
Physics
POROSITY
RAILWAYS
STEELS
Treatment of materials and its effects on microstructure and properties
WELDED JOINTS
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Summary:This paper describes a comparative study of the hardness characteristics, mechanical properties, microstructures, and fracture mechanisms of the thermite welded rail steel joints before and after heat treatment. It has been found that heat treatment of the welded joint improves the mechanical properties (UTS and elongation), and changes the fracture mechanism from brittle to ductile. Improved strength and elongation are attributed to the finer ferrite–pearlite microstructure and the different fracture mechanism. Microporosity and numerous inclusions were seen on the fracture surface of the welded joint. The chemical composition of the inclusions indicated that the molten thermite mixture had reacted with the magnesite lining of the ladle and the feeder.
ISSN:1044-5803
1873-4189
DOI:10.1016/S1044-5803(99)00006-6