Abstract
The behavior of fatigue cracks propagating along the weld interface of friction welded butt joint plate specimens with a single side edge notch and/or with a center notch composed of a free cutting stainless steel JIS. SUS303 was observed under a repeated tension load condition with a stress ratio of R=0 and with a frequency of 30Hz. Reference data were also obtained by using diffusion welded butt joint plate specimens with a single side edge notch, where the base metal was the same as the above.The experimental results indicated that the crack growth rate in the friction welded joints was much lower than that in the base metal for the cracks propagating the side edge of the specimen, despite that the crack growth rate from the center of the joints was much higher in comparison with that of the base metal.This suggests that the residual stress distributed along the crack growth path, together with the microstructure, gave a great influence on the crack growth behavior of the friction welded joint. To verify this points, the crack growth rate was evaluated against the modified stess intensity factor K' which was calculated numerically in considering both of the applied stress and the residual stress.The da/dN-ΔK' relation showed the similar tendency to that of the base metal in the case of the cracks propagating from the side edge.Furthermore, the diffusion welded joint plate specimen with a single side edge notch showed much higher crack growth rate than the base metal. This is attributed to the difference in the metallurgical feature at the welded interface between the friction welded and diffusion welded joints.
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