二段二重重複繰返し応力を受ける18-8オーステナイト鋼の高温疲労における変形と温度上昇について

概要

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The double-repeated rotating bending fatigue tests of 18-8 austenitic steel were carried out an room temperature, 400℃, 500℃ and 600℃. The main conclusions arrived at are as follows. (1) Remarkable surface temperature rise is measured during the fatigue tests of solution-treated 18-8 austenitic steel. Its behavior has the same tendency as that of the deflection of the specimens during the fatigue tests. (2) Generally, cumulative cycle ratio Σ(n/N) is larger than one when the secondary stress level σ_2 is higher than the primary stress level σ_1. However, the effect of stress sequence on Σ(n/N) is not observed at 600℃, nor is it observed at any temperature when the cycle ratio of the primary stress level n_1/N_1 is 0.25. (3) The relation between Σ(n/N) and the surface temperature and deflection during the double-repeated fatigue tests are as follows. When σ_1<σ_2, the surface temperature and deflection under the secondary stress level σ_2 are smalle r than those under the constant stress σ_2 of the same level. When σ_1>σ_2, the former is larger than the latter. When the stress sequence have not an effect on Σ(n/N), the former is much the same as the latter.
社団法人日本材料学会の論文
1968-11-15