Abstract
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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