Abstract
The high-temperature fatigue crack growth rate and progressive damage region around the crack tip were investigated for the range of f=1 Hz0.001 7 Hz under a vacuum condition (1.3 MPa) and 650°C using SUS 304 stainless steel. A creep test was also carried out under the same conditions. From these experimental results, the fatigue crack growth mechanism is found to be different from the creep crack growth mechanism by the observation of the frequency characteristics and the behavior of the progressive damage region. The stress increasing and decreasing processes for fatigue crack growth do not saturate the stress holding process for creep crack growth even though the stress increasing and decreasing rates decreases. The crack growth rate is found to be controlled by the progressive damage rjgion around the crack tip.
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