Abstract
Room temperature fatigue crack initiation and propagation in the wrought nickel-base superalloy Udimet 700 were investigated with electropolished and glass bead blasted material. Cracks were found to initiate at the surface along coherent annealing twin boundaries oriented for maximum in-plane shear stress in both the electropolished and glass bead blasted conditions even though bead blasting more than doubled the fatigue strength. This increase was found to result from an enhanced crack initiation resistance, but even more importantly from a very pronounced retardation of early Stage I crack propagation by the residual compressive surface stress induced in glass bead blasting.
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Burck, L.H., Sullivan, C.P. & Wells, C.H. Fatigue of a glass bead blasted nickel-base superalloy. Metall Trans 1, 1595–1600 (1970). https://doi.org/10.1007/BF02642005
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DOI: https://doi.org/10.1007/BF02642005