プロペラ軸用Ti-6Al-4V合金の性質

概要

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The corrosion behavior of such materials composing a ship as Ti-6Al-4V for propeller shaft, an Al-Mg alloy for body and Al-bronze for propeller are investigated. A kind of Al-Zn-Ga alloy is found out to be a good sacrificial anode. The good properties are proved by a corrosion test in real sea water for a year, too.<BR>A crevice corrosion test is carried out to check the corrosion behavior of propeller shaft coupled with a kind of stainless steel, and proved to be no problem.<BR>The effects of hydrogen absorption on the mechanical properties of Ti-6Al-4V is examined, and it shows no change up to about 1000ppm in the case of specimen absorbing it uniformly.<BR>The size effect of fatigue strength of Ti-6Al-4V is proved to be no more than that of steels.<BR>The propagation rate of fatigue crack in synthetic sea water is proved to be equal to that in air, if Ti-6Al-4V is applied under cathodic protection.
社団法人日本マリンエンジニアリング学会の論文