SEDL / STP / STP755-EB / STP28412S

Fatigue Crack Propagation in the Heat-Affected Zone of 2¼Cr-1Mo Steel and ERNiCr-3 Weldments

Weerasooriya, T
Associate Research Engineer, Aerospace Mechanics Division, University of Dayton Research Institute, Dayton, Ohio

Pages: 18    Published: Jan 1982

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Abstract

The fatigue crack growth rate at 510°C in the heat-affected zone (HAZ) of a 2¼Cr-1Mo steel weldment was examined as a function of frequency and stress-intensity factor. The weldment was made of isothermally annealed 2¼Cr-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 ERNiCr3 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 MPam<ΔK<35MPam.