工業用純チタンの疲労切欠感度に及ぼす結晶粒径の影響

概要

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The effect of a grain size on notch sensitivity in fatigue and crack growth of commercially pure titanium has been studied under push-pull loads, using mainly a two-stage replica technique with particular emphasis on the initiation of fatigue cracks at the notch root. Pure titanium has no non-propagating cracks even for a sharp notch with notch radius of 0.02 mm. It also shows the lowest sensitivity compared to mild steel and other metals. Notch sensitivity becomes lower as grain size increases, however, crack growth rates were not affected by grain size. It is concluded that the above-mentioned fatigue phenomenon of a pure titanium can be ascribed to a considerably high grain boundary constraint for the initial growth of a crack the size of one grain, due to the scarcity of slip systems.
一般社団法人日本機械学会の論文
1986-12-25