Publikace detail

Structural Degradation of Heterogeneous Welded Joints

Autoři: Hanus Petr | Schmidová Eva

Rok: 2012

Druh publikace: článek v odborném periodiku

Název zdroje: Materiálové inžinierstvo / Materials Engineering

Název nakladatele: Žilinská univerzita

Místo vydání: Žilina

Strana od-do: 149-156

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
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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