0.78 0.79 0.80 0.81 0.82 2.25Cr-1Mo(610MPa) 3ppm, tested in air R.T. 3.5T-CT,J-factor=96 Potential Drop (V) Elapsed time (hr.) 4 8 12 16 200 300 400 500 600 KIH C.D. Crack Load R.L. R.L. R.L. C.D. Load (kN) 0 5 10 15 20 25 30 0 1 2 3 4 Δa H (mm) Crack Extention Load (kN) Elapsed Time (hr) Load 0 10 20 30 2.25Cr-1Mo(610MPa) 5ppm, tested in air R.T. 1T-CT,J-factor=154 RL CD Figure3 Typical crack growth behavior of RL+CD test Figure 4 Crack growth behavior of repetitional RL and CD loading 20 40 60 80 100 10-9 10-8 10-7 10-6 1x10-5 1x10-4 10-3 10-2 2.25Cr-1Mo(610MPa) 5ppm, tested in air R.T. 1T-CT,J-factor=96 KIH Kth CD RL KI(MPa m1/2) da/dt (mm/sec.) Figure 5 K and da/dt relationship of a RL+CD test 0 2 4 6 8 10 12 40 80 120 160 200 KIC-H KIH Low J Mid J Δa (mm) K total (MPa√m) -80 -40 0 40 80 120 0 100 200 300 400 500 3-5ppm 1.5ppm Half solid: Unstable Fracture KIH(J) KIC(J) KIH(J) (MPa√m) FATT ( ℃) Figure 7 K-curves of Mid J and Low J heats Figure6 KIH and KIC for a variety of temper embrittled steels
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