206 SUS304 鋼の下限界近傍の真空中高温疲労き裂伝ぱ挙動およびその疲労破面のフラクタル特性

概要

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Fatigue crack growth behaviors at elevated temperatures were investigated for SUS304 stainless steel. Fatigue crack growth tests were conducted in the near-threshold region using single-edge-cracked specimens at 350,550,and 650(℃). Crack growth behaviors of SUS304 in a vacuum were compared with those in air. It was found that the crack growth rate da/dN in a vacuum was as low as one-tenth of that in air. Threshold value, ΔK_<th>, was higher than that in air. The crack growth restarted when the maximum stress intensity factor, K_<max>, was increased for a crack exhibiting threshold behavior. An investigation of the fractal properties of fatigue fracture surfaces in SUS304 steel tested at 550℃ was performed. It was found that measured values of fractal dimension was scarcely dependent on stress intensity factor range ΔK.
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