K-0509 塩水中におけるフェライト系ステンレス鋼SUS444の微小疲労き裂成長挙動(G03-5 環境強度)(G03 材料力学部門一般講演)

概要

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The influence of specimen orientation on crack initiation and early crack growth behavior in 3%NaCl solution was studied in a ferritic stainless steel, JIS SUS444. Plate specimens with two different orientations, ie. L and T direction, were prepared. In both orientations, cracks were generated from slip bands in ferrite grains. The anisotropy in fatigue strength was not recognized in laboratory air and 3%NaCl solution. Fatigue lives were shorter in 3%NaCl solution than in laboratory air, but the fatigue limit at 10^7 cycles was almost similar in both environments. While no perceptible differences in early crack growth region were seen between both directions, crack growth rates were faster in 3%NaCl solution than in laboratory air.
2001-08-22