Fatigue Crack (b) Fatigue Crack (a) Figure 8 Fractography of Low J (a) and Mid J (b) heats 0 5 1015202530 0 1 2 3 4 5 2.25Cr-1Mo 5ppm, tested in air R.T. 1T-CT Enhanced (TS=680MPa) Annealed (TS=453MPa) Low J (TS=610MPa) RL CD Δa (mm) Elapsed Time (hr.) Figure 9 Crack growth measurement of RL+CD tests for various strength steel KIH Kth KIC-H Log da/dt Effect of temper embrittlement Effect of strength Log K Rising Load Constant Disp. Figure 10 Schematical illustration of I.H.E. crack growth curve of 2.25Cr-1Mo steel
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