Abstract

DE LOS REYES-RODRIGUEZ, Frank; CAPO-SANCHEZ, Julio  and  FRANCO-FIDALGO, Eduardo. Mathematical model to characterize the ageing on over aged 12Cr1MoV steel starting from Barkhausen effect. Ingeniería Mecánica [online]. 2012, vol.15, n.1, pp. 66-72. ISSN 1815-5944.

In this work, a mathematical model to characterize the ageing degree on 12Cr1MoV steel used on main steam pipes from power plants is developed. This model start from Bertotti´s model about the variation of magnetic flux with the time, obtaining different mathematics expressions which relate the induced voltage on the coil and known as Magnetic Barkhausen Noise (MBN) with grain and carbides size, which constitute, among others parameters, one that can be used to evaluate the ageing process on the analyzed steel, with the developed model a decreasing and increasing later of voltage with the increasing of grain and carbide size respectively for the same magnetic field applied is verified, with this result it is possible to corroborate the magnetic measurements which be developed using MBN on practice applications.

Keywords : non destructives testing; magnetic Barkhausen noise; aging steels.

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