Abstract
Fatigue tests of 0.08% C Steel were made on in-plane bending at elevated temperatures up to 450°C (Room temperature, 200°C, 375°C and 450°C). the threshold stress intensity factor ΔKth was determined by the critical condition of whether specimens broke or not at 107 cycles. The threshold stress intensity factor reached a maximum at 375°C. The value of Kop/Kmax increased with increasing temperature up to 450°C. Both ΔKeff th and ΔKeff th/E showed the same temperature dependence as described above. The oxide at 375°C was thinner than that at 450°C. The value of ΔKth at 375°C, however, was larger than that at 450°C. It is concluded that the maximum ΔKth is caused by strain aging rather than thick oxide induced closure.
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