Ni-Cr-Mo鋼の常温および高温(350℃)におけるねじり塑性疲れ試験結果について

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  • Torsiona1 Fatigue Test of Ni-Cr-Mo Steel at Room Temperature and High Temperature (350°C)
  • Ni-Cr-Mo コウ ノ ジョウオン オヨビ コウオン 350ドC ニ オケル ネジリ ソセイ ツカレ シケン ケッカ ニ ツイテ

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In this paper, both the cyclic straining test and the cyclic stressing test of the Ni-Cr-Mo steel were carried out completely reversed in torsion, at room temperature and at high temperature (350°C), for the investigation of the plastic fatigue phenomena. At room temperature, the stress amplitude decreases with the number of cyclic straining, and the strain amplitude increases with the number of cyclic stressing. The fatigue lives of both tests were compared on common setting-up cycle. Then the fatigue lives of cyclic straining test are longer than those of cyclic stressing test. On the other hand, the same phenomena were amplitude observed, at high temperature, but the changing aspect of the strain amplitude and the stress are not so large as in case of room temperature. The difference of the temperature influences the fatigue life so much. That is, for the same setting-up stress, the fatigue lives at room temperature are longer than those at 350°C, due to the lower stress-strain curve at 350°C, but for the same setting-up strain, the fatigue lives at 350°C are longer than those at room temperature, due to the annealing effect.

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