STP665

    A Review of the Constant Strain-Rate Stress Corrosion Cracking Test

    Published: Jan 1979


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    Abstract

    A review of six years operational experience in using the slow strain test procedure has indicated several unique advantages associated with dynamic strain techniques and also identified an area of limitation.

    The chief advantage of the dynamic slow strain test procedure is that it is much more aggressive in producing stress corrosion cracking (SCC) than conventional constant-strain or constant-load tests, so that the testing time is considerably reduced. The procedure reduces the incubation period for crack nucleation by virtue of continuous straining above the elastic limit on smooth surfaces, and avoids the pitfalls associated with reducing incubation times by means of precracking and other methods. With the latter methods, marked chemical inhomogeneities in an environment have been observed so that spurious results are obtained.

    The slow strain test is also ideally suited, on a “go-no-go” basis, for rapid sorting or screening of environment/metal or environment/metallurgical-condition combinations which can produce SCC. However, the test is not suitable for ranking materials with regard to their resistance to SCC when the strength levels and microstructure vary widely. Furthermore, because of the test severity, discretion must be exercised in translating susceptibility to SCC observed in the laboratory to anticipated performance in service.

    Keywords:

    stress corrosion cracking, hydrogen-induced cracking, strain rate, steels, ammonia, nitrate, caustic, carbonate-bicarbonate


    Author Information:

    Kim, CD
    Associate research consultant and section supervisor, Research Laboratory, United States Steel Corporation, Monroeville, Pa.

    Wilde, BE
    Associate research consultant and section supervisor, Research Laboratory, United States Steel Corporation, Monroeville, Pa.


    Paper ID: STP38111S

    Committee/Subcommittee: G01.06

    DOI: 10.1520/STP38111S


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