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- W4385833483 abstract "For rail wear problems after long-term use, laser cladding technology has attracted more attention in the field of rail repair. At the present stage, the research mainly focuses on continuous laser and rectangular pulse laser cladding or forming. There are few research on other laser shape. In this study, the effects of pulse shape (ramp up, hybrid ramp, rectangular) on the geometry characteristics (width, depth, height, and dilution) of single-track cladding layer as well as the microstructure and properties of cobalt-based multi-track laser cladding layers on rail steel were investigated. The results show that the main factor affecting the melting width and height was the laser power and scanning speed, respectively. The pulse waveform has the greatest influence on the dilution rate. The overall microhardness of the cobalt-based coating was higher than that of the substrate due to the generation of carbides during the multi-pass cladding process. A large number of coarse acicular martensite appeared in the heat-affected zone of the high-carbon steel substrate after the rapid heating and cooling process of laser cladding, which resulted in increasing hugely in the microhardness of the zone. The cladding layer with the most severe oxidation, the smallest grain size, the highest microhardness and the best corrosion resistance was formed under rectangular laser shape. Due to the limitation of cooling rate, the cladding layer created by hybrid ramp laser produced rough grain structure and lowest microhardness. The best overall morphology of the clad layer was achieved under ramp up laser conditions. Due to the lower energy input and lowest cooling rate, the grain size was the coarsest and the corrosion resistance was poor." @default.
- W4385833483 created "2023-08-16" @default.
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- W4385833483 date "2024-01-01" @default.
- W4385833483 modified "2023-10-17" @default.
- W4385833483 title "Macroscopic morphology and properties of cobalt-based laser cladding layers on rail steel based on pulse shaping" @default.
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- W4385833483 doi "https://doi.org/10.1016/j.optlastec.2023.109940" @default.
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