Abstract
The fatigue crack growth rate at 510°C in the heat-affected zone (HAZ) of a 2 1 / 4 Cr-1Mo steel weldment was examined as a function of frequency and stress-intensity factor. The weldment was made of isothermally annealed 2 1 / 4 Cr-1Mo steel base metal and ERNiCr-3 weld metal. Fatigue crack growth rate data for thermally aged HAZ material lie between the two scatter bands of data for the base metal and ERNiCr-3 filler metal at 510°C. Prior thermal aging up to 2000 h at 566°C does not substantially change the fatigue crack growth rate of HAZ material at 510°C. Fatigue crack growth rate of HAZ material increases with decreasing frequency at 510°C and stress ratio of 0.05 for 20 MPa√m < ΔK <35 MPa√m.
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