転造Vみぞ付き丸棒の疲れ強さ : 続報人工時効による疲れ強さの向上

概要

論文の詳細を見る
In the previous papers, the authors reported the results that there exists a considerable increase in fatigue limit of the specimens of 2 sorts of steel with V-notch formed by coldrolling compared with the one of the specimens with V-notch formed by cutting off. In this paper, they tried to explain the extent to which the fatigue strength is effected by the low temperature annealing by experiment on the round steel (S 25 C) bar with rolled V-notch. That is to say, when the duration of annealing was taken to be 24 hours, the best results was acquired at the annealing temperature of 80℃, increasing the fatigue limit by 20% compared with those which are not annealed, and when the aging was done at 200℃, 30 minutes, the fatigue limit was increased as almost high as that annealed 24 hours at 80℃. The variation in hardness due to aging ressembles to the variation in fatigue limit due to aging, and the aging condition giving the maximum fatigue limit is the same with the condition by which the maximum hardness is given.
一般社団法人日本機械学会の論文
1957-03-25