人工海水中での60kgf/mm^2級高張力鋼溶接部材の腐食疲労き裂伝ぱ挙動について

概要

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The corrosion fatigue crack growth behavior in the butt welded joint of high tensile strength steel has been studied in a synthetic sea water and discussed in relation to the welding residual stress and corrosion deposits. For the base metal, the effect of synthetic sea water on da/dN depended on the stress ratio. At a high stress ratio, a little acceleration of da/dN by the synthetic sea water was observed while at a low stress ratio the da/dN tended to be lower than that in air. For the welded joint, the da/dN was affected by a compressive residual stress in both synthetic sea water and air, and was greater in air than in synthetic sea water. Such a crack growth behavior is related to the crack opening and closure behavior which is influenced by the corrosion deposits and the compressive residual stress.
社団法人日本材料学会の論文
1989-05-15