Abstract
The wavy grain boundaries (GBs) in U-700 alloy improve remarkably the creep rupture strain and the resistance to the creep fracture. By comparing the measured and predicted creep crack initiation life at the sharp notch root it is demonstrated that creep J*-integral is the effective parameter controlling the asymptotic field and the damage rate at the tip of the sharp notch (and so the crack). Based on this result a combined analysis using the linear damage model and the HRR singularity is carried out and an expression for creep crack growth rate is derived, which is in good agreement with experimental results of the alloy with smooth and wavy GBs. A microscopic mechanism of the creep damage in the alloy with wavy GBs is proposed from the point of view of the cavitation along the GBs.
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