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2 2017

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Napawanie laserowe tarcz zderzaków kolejowych brązem aluminiowym

Sitarz M., Kurc-Lisiecka A., Gamon W.

Stal, Metale & Nowe Technologie

2017

nr 9-10

80--84

W artykule opisano wyniki badań procesu napawania laserowego powierzchni tarcz zderzaków kolejowych ze stali S355J2 proszkiem na bazie brązu aluminiowego. Próby napawania wykonano za pomocą lasera diodowego dużej mocy (HPDL) LDF 4000-30 firmy LaserLine o mocy maksymalnej 4,0 kW. Badania obejmowały również obserwacje metalograficzne wytworzonych warstw, badania ich odporności na zużycie ścierne i pomiary twardości. Stwierdzono, że w wyniku napawania laserowego tarcz zderzaków kolejowych ze stali S355J2 proszkiem brązu CuAl9Fe3 i laserem diodowym HPDL możliwe jest wykonanie wysokiej jakości napoin bez nieciągłości strukturalnych i o korzystnej, drobnoziarnistej strukturze dendrytycznej w obszarze napoiny. Wykazano również, że napawanie laserowe brązem aluminiowym zapewnia znaczący wzrost odporności na zużycie ścierne powierzchni czołowych tarcz zderzaków kolejowych i pozwala na wyeliminowanie konieczności okresowego ich smarowania.

The paper presents the results of the study of the laser powder cladding of railway buffers heads made of the S355J2 steel by aluminium bronze-based powder. The high power diode laser (HPDL) LDF 4000-30, produced by LaserLine, with the maximum output power of 4.0 kW, was used for the cladding trials. The investigations included also the metallographic observations of the clad layers, wear behaviour and hardness measurements. It was found that it is possible to produce high-quality clad layers of the aluminium bronze CuAl9Fe3 on the steel substrate, without any internal imperfections, such as voids or structural discontinuities, and characterized by fine-grained dendritic structure in the fusion zone of the clad. It was also shown that the laser cladding of aluminium bronze provides a significant increase of wear resistance of buffer working surfaces and can also eliminate the need of periodical greasing of these surfaces.

Surface Analysis of Railway Buffers Heads Covered with Bronze Using Laser Cladding

Sitarz M., Kurc-Lisiecka A., Gamon W.

Archives of Foundry Engineering

2017

Vol. 17, iss. 2

89--94

Railway buffers during the operation are staying in almost permanent contact with each other, creating friction node in the point of contact of two railway buffer heads. In consequence of overcoming track curves, turnouts and unevenness of track, the railway buffer heads moves relative to each other causing friction, which results in its wear. When the wear is excessive, it might be a reason to withdrawn vehicle from service, it causes flattening of buffer head, and in consequence its abnormal cooperation. To avoid this phenomenon the buffer heads should be covered with graphitized grease, but this method has many disadvantages. Accordingly, it was found that it would be beneficial to cover the buffer head with bronze using laser cladding. In this article the metallographic and mechanical analysis of the newly created top layer of railway buffer head are presented. In article the results from tribological tests conducted on Amsler test bench are also presented. Based on test results described in article concluded that the layer of bronze coat on working surface of railway buffer head can be beneficial from operational point of view.