STP645

    Fractographic Observation of Stress-Corrosion Cracking of AISI 304 Stainless Steel in Boiling 42 Percent Magnesium-Chloride Solution

    Published: Jan 1978


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    Abstract

    The fracture surface of AISI 304 stainless steel in stress corrosion cracking (SCC) in boiling 42 percent magnesium-chloride (MgCl2) solution was investigated fractographically by scanning electron microscopy. To determine the orientation of fracture surface, etch pits were formed on fracture surface by the electroetching method in 1 N sulfuric acid (H2SO4) + 100 mg/litre ammonium thiocyanate (NH4SCN) solution. It was made clear from morphology of etch pit that fracture surface in SCC was almost everywhere on the {100} plane, namely, the path of the crack was determined by crystal orientation and direction of stress. In addition, a striation-like pattern was often found by careful observation on the flat surface.

    Keywords:

    fractography, orientation, fan-shaped pattern, step, tear ridge, striations, etch pit, facet, corrosion tunnel, stress intensity factor


    Author Information:

    Mukai, Y
    Doctor and professor, Faculty of Engineering; doctor and professor, Welding Research Institute; and Research associate, Faculty of Engineering, Osaka University, Osaka,

    Watanabe, M
    Doctor and professor, Faculty of Engineering; doctor and professor, Welding Research Institute; and Research associate, Faculty of Engineering, Osaka University, Osaka,

    Murata, M
    Doctor and professor, Faculty of Engineering; doctor and professor, Welding Research Institute; and Research associate, Faculty of Engineering, Osaka University, Osaka,


    Paper ID: STP38091S

    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP38091S


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