STP665

    Slow Strain-Rate Technique: Application to Caustic Stress Corrosion Cracking Studies

    Published: Jan 1979


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    Abstract

    This paper describes slow strain-rate test equipment, operable at elevated temperatures and pressures, that includes electrochemical potential control capability. Applications in caustic stress corrosion cracking (SCC) studies of both nuclear steam generator and fossil boiler materials are presented. Electrochemical potential regions for stress corrosion cracking of Inconel alloy 600, Incoloy alloy 800, and Type 304 stainless steel are compared to results obtained using constant load specimens. Tests with titanium stabilized Alloy 800 (Sanicro 30) tubular specimens also demonstrate the effect of potential on cracking mode. A comparison of SCC test results, using both long term exposure tests and short term straining electrode tests, is made between a mild steel and its weld metal. In these examples, favorable comparisons are obtained with tests using conventional methods, proving the value and usefulness of the slow straining device in accelerating SCC studies and in defining more accurately conditions under which SCC can occur.

    Keywords:

    stress corrosion cracking, alloys, stainless steels, carbon steels, basemetal, weld metal, slow strain-rate tests, electrochemical potential


    Author Information:

    Theus, GJ
    Corrosion group supervisor and research specialist, Babcock & Wilcox, Research and Development, Alliance, Ohio

    Cels, JR
    Corrosion group supervisor and research specialist, Babcock & Wilcox, Research and Development, Alliance, Ohio


    Paper ID: STP38110S

    Committee/Subcommittee: G01.06

    DOI: 10.1520/STP38110S


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