ステンレス鋼における腐食疲労き裂の発生と初期成長挙動

概要

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Fatigue tests have been performed on a dual-phase stainless steel, SUS 329 J 4L, and an austenitic stainless steel, SUS 304,in order to clarify the crack initiation and early crack growth behavior in 3% NaCl. Crack initiation in room air occurred due to ductile transgranular slip in both stainless steels. In contrast, cracks were generated at the austenite-ferrite phase boundary of SUS 329 J 4L and at the corrosion pit of SUS 304 in 3% NaCl. Early crack growth in the microstructurally small crack region seemed to be enhanced in 3% NaCl for both stainless steels. In larger regions, the crack growth behavior for SUS 329 J 4L was coincident with the da/dN-ΔK_<eff> relationships for long cracks, while a breakdown in ΔK similitude was found for SUS 304. Environmental effects were less evident for long cracks, except for a slight increase in da/dN at high ΔK region in both stainless steels.
1997-03-25