Abstract
Fatigue crack growth behavior of SUS 304 stainless steel when one slow-fast strain cycle was introduced to the fast-fast strain cycles was investigated at 600 °C. It was found that the fatigue crack growth rate in the fast-fast strain cycles was accelerated by the introduction of one slow-fast strain cycle. It was also found that there was a linear relationship between the size of the region where the acceleration occurred and the value of creepJ-integral range, ΔJC, which was produced just when one slow-fast strain cycle was introduced. To investigate the above acceleration, the longitudinal section through the specimen was observed. It was shown that the wedge-type cracks were produced at the grain boundaries and that they contributed to the above acceleration. Based on the results thus obtained, the predicting procedure of crack growth curve when one slow-fast strain cycle was introduced to the fast-fast strain cycles was proposed. As the result, it was shown that the predicted crack growth curve was in good agreement with the experimental one.
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