Resumo

SANABRIA BECERRA, William Mauricio; PARDO CUERVO, Oscar Hernando  e  TORRES GOMEZ, Robinson de Jesús. Limit to corrosion fatigue strength evaluation of sae 1020 steel in acidic environment. Tecnura [online]. 2015, vol.19, n.43, pp.84-92. ISSN 0123-921X.  https://doi.org/10.14483/udistrital.jour.tecnura.2015.1.a06.

This paper shows the results of the research in terms of the evaluation of corrosion fatigue resistance of SAE 1020 steel in acidic conditions, using as corrosive substance: acetate buffer with pH 2, 4 and 6. The fatigue tests were performed according to the model of cantilever rotating bending. The results were compared with the limit of fatigue resistance of the material tested in air. It was observed a significantly reduced limit with increasing acidity of the substance. Likewise, localized corrosion type filiform corrosion was observed on the surface material, caused by the effect of the specimen aerated to be partially submerged in rotation. Limits fatigue strength determined using staircase method recommended by standard ISO 1143 and ISO 12107, with confidence level of 50% and a probability of failure of 10%. Finally, the surfaces were analyzed to find multiple origins of fracture and crack propagation lengths related to the acidity of the medium.

Palavras-chave : corrosion fatigue; fatigue resistance; filiform corrosion; rotating bending.

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