Precracked center notch specimens of 18% Ni maraging steel (250) and (300) were preloaded in dry argon and air, respectively, to various percentages of KIc, unloaded, and then threshold stress intensity KISCC was measured in dry hydrogen. Permanent, approximately linear increase of KISCC with KI preload was observed. Fractography shows changes of a straight crack path in the location of a plastic zone developed due to crack preloading.

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© 1973 National Association of Corrosion Engineers
1973
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