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    Experimental Methods for the Evaluation of Environmentally Assisted Cracking of Steel in Caustic

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    This paper explores several popular test types and techniques used to study environmentally assisted cracking (EAC) with a view to identifying those tests that yield consistent data for purposes of materials screening and design data development. Test types considered include corrosion fatigue, stress corrosion, and potentiodynamic polarization. The influence of mechanical variables (such as strain rate, frequency, stress ratio, magnitude of stress, and stress intensity) and environmental parameters (such as electrochemical potential) on EAC is discussed in light of slow-strain-rate and precracked specimen test methods. The data generated by these various test methods are evaluated for their utility in designing structures. Throughout, the vehicle for discussion is test results developed with these test methods in iron-caustic and steel-caustic systems. It is concluded that much remains to be done in regard to the development of standards that couple the influence of both mechanical and electrochemical parameters in a manner which reflects the range of possible service experience.


    environment, iron, steel, caustic, stress corrosion, corrosion fatigue, fatigue, test methods, standards

    Author Information:

    Rungta, R
    Battelle Columbus Laboratories, Columbus, Ohio

    Leis, BN
    Battelle Columbus Laboratories, Columbus, Ohio

    Committee/Subcommittee: G01.06

    DOI: 10.1520/STP34442S