鋼の疲労進行過程の静的ねじり試験法による研究(第4報) : 伸線後低温焼なましした鋼の場合

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In the present report, we have studied on the effect of low temperature annealing at 200 and 400℃ upon the fatigue processes of cold drawn steel, mentioned in the 3rd report. The results obtained are as follows : (1) The fatigue process in case of the repeated stress below the fatigue limit. In low temperature annealed steel with high carbon content, the progress of fatigue does not occur with the increase of number of stress cycles. In low temperature annealed steel with low carbon content, when the repeated stress is small, it does not occur, either. But when the repeated stress is near the fatigue limit, the fatigue progresses up to the stage of formation of submicroscopic cracks. In this case, as the fatigue failure does not occur, it is considered that this process of formation of submicroscopic cracks stops within a certain extent. These results described above have the same tendency with the case of cold drawn steel, mentioned in the 3rd report. (2) The fatigue process in case of the repeated stress above the fatigue limit. In the low temperature annealed steel with either high or low carbon content, the fatigue process is almost the same as in the case of cold drawn steel, mentioned in the 3rd report. But according to the annealed temperatures, the relative duration of fatigue stages differs respectively. (3) The cycle ratio at the time of formation of submicroscopic cracks. (a) In high carbon steel, it has a value of about 85% for cold drawn state, about 60% for annealed state at 200℃ and about 70% for annealed state at 400℃. But in either case, it has no relation to the magnitude of repeated stress and shows a nearly constant value. (b) The low temperature annealing after cold drawing makes it small for high carbon steel, but large for low carbon steel.
社団法人日本材料学会の論文
1962-08-15

鋼の疲労進行過程の静的ねじり試験法による研究(第4報) : 伸線後低温焼なましした鋼の場合

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