51313-02691-Comparative Study Using DL-EPR and Eddy Current to Determine Sigma Phase in Super Duplex SS

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Product Number: 51313-02691-SG

ISBN: 02691 2013 CP

Author: Kioshy Assis

Publication Date: 2013

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The quantification of intermetallic phases (? ? and Cr2N mainly) and the influence on susceptibility to localized corrosion of super duplex stainless steels has a strong scientific and practical appeal. Mainly enable the reduction of costs in terms of unwanted stops preventing failures of equipment and facilitate the estimated of remaining life of a component whose corrosive process is an imminent risk. Currently the techniques of electrochemical potentiodynamic reactivation with double loop (DL-EPR following the ISO 12732) and eddy current (EC) are presented as potentials tooling for characterization of the susceptibility to localized corrosion and materials characterization of stainless steels respectively in laboratory scale. The application of these techniques in welded joints of stainless steels is a technical challenge which basically involves the development of a methodology where aspects related to the limits of detection and characterization are best analyzed. In this sense this paper firstly presents a comparison between the techniques of DL-EPR and EC to quantification of intermetallic deleterious phases in samples of a super duplex stainless steel (UNS S32750) under different isothermal treatments (annealing and aging). Then we apply the different methodologies (DL-EPR and EC) in two welded joints with different heat inputs for evaluating the applicability of the techniques in real operating conditions.