Publication detail

Structural Degradation of Heterogeneous Welded Joints

Authors: Hanus Petr | Schmidová Eva

Year: 2012

Type of publication: článek v odborném periodiku

Name of source: Materiálové inžinierstvo / Materials Engineering

Publisher name: Žilinská univerzita

Place: Žilina

Page from-to: 149-156

Titles:

Language	Name	Abstract	Keywords
cze	Strukturní degradace heterogenních svarových spojů	Byl zkoumán vliv technologie heterogenních svarů celí na degradaci struktury materiálu.	heterogenní svary; navařování kolejnic; dendritické odníšení;
eng	Structural Degradation of Heterogeneous Welded Joints	Developing the techniques of welding materials with higher dynamic strength onto the rolling surfaces of rails is one of the options for increasing their operational endurance. The subject of this paper is an analysis of heterogeneous weld joints experimentally manufactured by welding medium-carbon austenitic steels onto high-carbon unalloyed pearlitic steels. The analyses focus on examinations of the marginal mixing of the materials at the fusion line and the circumstances under which intercrystalline cracks form in the weld deposit layers. Structural analyses, chemical microanalyses and a hardness assessment were performed in order to identify the corresponding structural changes. The proportion of zonal vs. interdendritic segregation of the alloying elements in the degradation of the welded joint was distinguished. We described the nature of the structural heterogeneities produced, locally connected with the martensitic transformation. The chemical heterogeneity leading to the formation of martensite at grain boundaries was identified as the limiting effect.	Heterogeneous welded joints; Overlaying welding of rails; Dendritic segregation.

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