各種ステンレス鋼の高温回転曲げ疲労特性に関する研究

概要

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The rotating bending fatigue tests were carried out at room temperature, 200℃, 400℃, 600℃ and 800℃ with a frequency of 1200 cycles/min. using SUS 304 solution treatment material and SUS 304-1/2 H 10% cold working material, and were carried out at room temperature, 300℃ and 600℃ using SUS 430 and SUS 403. The cold working material showed higher strength at finite life and fatigue limit in every temperature than the other materials did, although the difference of fatigue limit above 400℃ between the cold working material and the other materials were a little. The relationships between the fatigue limit σ_W and the tensile strength σ_B were obtained as σ_W=0.44σ_B for SUS 304 at every temperature and SUS 304-1/2H over 200℃, and σ_W=0.58σ_B for SUS 430, SUS 403 at every temperature and SUS 304-1/2H below 200℃. Besides, the relationship between the stress ratio σ_a/σ_<wR.T.> and the parameter P=(10-log N_f)/T was proposed to estimate the fatigue strength at finite life, where σ_a is the bending stress amplitude, σ_<wR.T.> is the fatigue limit at room temperature, N_f is the cycles to failure and T is the absolute temperature.
2006-01-25