Resumo

DE LOS REYES-RODRIGUEZ, Frank; CAPO-SANCHEZ, Julio; FRANCO-FIDALGO, Eduardo  e  DE DIEGO-VELASCO, Gonzalo. Caracterización del envejecimiento de tuberías de vapor de centrales térmicas empleando el efecto BarkhausenCharacterization of steam pipes ageing degree from power plants using magnetic Barkhausen noise. Ingeniería Mecánica [online]. 2012, vol.15, n.2, pp. 123-133. ISSN 1815-5944.

In this paper, an ageing degree characterization of 12Cr1MoV steel using two method of magnetic Barkhausen noise is developed. A study of the microstructural evolution during ageing at operated conditions (15MPa, 550ºC) from 100000 h up to 150000 h was carried out using optic and scanning electron microscopy techniques. In the first method the experiments reveal a decreasing of root mean square of voltage with the ageing time, which is attributed to the decreasing of domain walls number per area units with the grain size increasing. In the second method the spheroidization level/average size of carbides was analyzed too with the total second peak height, determining a decreasing due to the change of the shape, size and acicularity of carbides phase.

Palavras-chave : ageing degree; barkhausen noise; steam pipes; carbides.

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