高温における低炭素鋼の動クリープ特性

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  • Dynamic Creep Characteristics of Low Carbon Steel at Elevated Temperature
  • コウオン ニ オケル テイタンソ コウ ノ ドウ クリープ トクセイ

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Dynamic creep and rupture tests were made with annealed low carbon steel. The test temperature was 450°C and the frequencies of alternating stress were 1800 and 5600 cpm. As the results of the tests, it is clarified that the creep strain is increased significantly by alternating stress superimposed over static stress. Allowable mean stress is reduced to about 86 or 63 percent or static Creep strength when stress ratio (alternating stress/mean stress) is increased from 0 (static) to 0.23 or to 0.70, respectively. On the other hand, the dynamic creep strength was analysed on the basis of mechanical equation of state and the results of static creep tests. The results of analysis agree well with the experimental ones. It was also indicated that both the results experimented and calculated show a fair agreement for the values of dynamic creep rupture strength.

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