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    Volume 6, Issue 1 (September 2017)

    Synthesis and Comparative Study on Intergranular Corrosion Characteristics of Stabilized 5A Grade Cast Duplex Stainless Steel

    (Received 6 March 2017; accepted 2 May 2017)

    Published Online: 19 September 2017

    CODEN: MPCACD

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    Abstract

    In this paper, stabilization using zirconium and niobium was investigated to reduce the effect of intergranular corrosion (IGC) in 5A grade cast duplex stainless steel. Computational thermodynamic software was used to determine the various heat treatment temperatures according to phase precipitation. Resistance to IGC was investigated by oxalic acid etch test and double-loop electrochemical potentiokinetic reactivation (DL-EPR) technique. The surface of the specimens was observed using optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffractometry to evaluate the presence of various intermetallic phases prone to IGC. Oxalic acid etch test response has indicated the susceptibility, whereas the DL-EPR test has provided the degree of sensitization. The results revealed that zirconium-stabilized samples are more susceptible to IGC compared to the niobium samples. Earlier formation of niobium compounds led to the reduction of intergranular attack in the niobium-stabilized samples.

    Author Information:

    Aneesh Kumar, P.
    Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappali,

    Kumaresh Babu, S. P.
    Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappali,

    Shaji Varghese, Asish
    Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappali,


    Stock #: MPC20170029

    ISSN:2379-1365

    DOI: 10.1520/MPC20170029

    Author
    Title Synthesis and Comparative Study on Intergranular Corrosion Characteristics of Stabilized 5A Grade Cast Duplex Stainless Steel
    Symposium ,
    Committee A01