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    STP1020

    Influence of Cathodic Charging on the Tensile and Fracture Properties of Three High-Strength Steels

    Published: 01 January 1989


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    Abstract

    The influence of cathodic charging in sulfuric acid solution on mechanical properties of AISI 4340, AISI 300M, and AMS 6340 steels was studied for different tempering temperatures. Cathodic charging decreased the tensile elongation, the reduction in area, and the ultimate tensile stress as a result of hydrogen-induced surface cracks having brittle features, which then transformed into cracks propagating by microvoid nucleation and coalescence along planes of maximum shear stress.

    The curves of the J-integral as a function of the crack advance Δa presented a change in slope at a small Δa value. For the lower tempering temperatures, this Δa value was relatively large and similar to that required to obtain a single crack propagating across the thickness. Cathodic charging decreased JIc as a result of bands of brittle cracking near each lateral surface and of facilitated initiation of cracking, in an alternating fashion along planes of maximum shear stress.

    Keywords:

    J-integral, hydrogen embrittlement, steel


    Author Information:

    Tremblay, V
    Research assistant and senior scientist, Institut de Recherche d'Hydro-Québec (IREQ), Varennes, PQ

    Graduate student and professor, École Polytechnique, Montreal,

    Nguyen-Duy, P
    Research assistant and senior scientist, Institut de Recherche d'Hydro-Québec (IREQ), Varennes, PQ

    Dickson, JI
    Graduate student and professor, École Polytechnique, Montreal,


    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP18847S