Agradecimentos: The authors acknowledge the financial support provide by CNPq (National Research Council),
Capes (Coordination for the Improvement of Higher Education), Fapesp (São Paulo Research
Foundation), LME at the Brazilian Nanotechnology National Laboratory (LNNano), Faepex
/Unicamp, MWL...

Agradecimentos: The authors acknowledge the financial support provide by CNPq (National Research Council),
Capes (Coordination for the Improvement of Higher Education), Fapesp (São Paulo Research
Foundation), LME at the Brazilian Nanotechnology National Laboratory (LNNano), Faepex
/Unicamp, MWL Brasil, Rodas e Eixos Ltda. and Vale S. A

To verify the effect of 0.13 % vanadium addition (% in weight) on the wear resistance of a railroad wheel steel with 0.7 % carbon, twin-disc rolling-sliding test were performed. These two steels were named 7V and 7C. The test discs were analyzed to verify the superficial conditions and wear...

To verify the effect of 0.13 % vanadium addition (% in weight) on the wear resistance of a railroad wheel steel with 0.7 % carbon, twin-disc rolling-sliding test were performed. These two steels were named 7V and 7C. The test discs were analyzed to verify the superficial conditions and wear mechanisms using SEM (Scanning Electron Microscopy) and roughness measurements. After 100,000 cycles running it was concluded that without the presence of debris, the 7V steel presented a reduction in 35 % the mass loss compared to 7C steel. For the 7V steel, in the test without debris, the discs presented small cracks (10 μm long), very near (3 μm deep) the surface, but in the test with the presence of debris, the disc surfaces presented delaminated material and long cracks (100 μm long) faraway from surface (up to 72 μm deep). The presence of debris also increased the roughness parameters in 7V steel: average Rz jumped from near 6 μm in the steel without debris to near 26 μm in the steel with debris

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ

COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP

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