Abstract
AbstractThis paper describes an experimental investigation of fatigue‐crack growth in an ultra‐high strength maraging steel, with particular attention to the relationship between crack growth rate and microstructural element size. The occurrence of intergranular fracture is shown to be unrelated to any grain size‐plastic zone size equivalence, while inflections in the growth rate vs ΔK relationship are discussed in terms of the interaction between the plastic zone and other microstructural dimensions. The incidence of intergranular fracture and crack surface oxide is shown to decrease with decreasing test frequency.
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