表層超細粒鋼板の海水中疲労強度とその評価(その2)

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In this paper, observations on the initiating and propagating behaviors of a corrosion pit and a corrosion fatigue crack in artificial sea water were made, in order to grasp the difference of fatigue strength in artificial sea water between surface layer and mid-section of a SUF plate. The boundary section specimens (one side is surface layer, and the other side is mid-section), which were cut off from the boundary between surface layer and mid-section of the SUF plate, were used for tests. As a result of quantitative considerations on the things described above, the following conclusions were obtained: (1) It becomes clear that there is a great difference in the initiating and propagating behaviors of a corrosion pit and a corrosion fatigue crack between surface layer side and mid-section side. That is, when a stress range (Δσ) is 31.6kgf/mm^2, on the surface layer side, a corrosion pit grows with its inner surface dissolved little by little, and a corrosion fatigue crack is not initiated although the corrosion pit grows up to about 230μm long. However, on the mid-section side, a corrosion pit grows as crystal grains are wrested due prior to intergranular corrosion, and a corrosion fatigue crack is initiated when the diameter of the corrosion pit is about 40μm. (2) The corrosion fatigue crack initiation life (N_c) of surface layer is more than 30 times longer by comparison with that of mid-section when a stress range (Δσ) is 31.6kgf/mm^2.
社団法人日本船舶海洋工学会の論文
1999-03-29

表層超細粒鋼板の海水中疲労強度とその評価(その2)

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