Abstract
Significant crack branching was observed in constant amplitude fatigue crack growth test of laser melting deposited Ti–55511 alloy. Fracture microscopic observations indicate that the orderly distributed αp laths is the most important factor as it contributes a lot to the initiation of secondary cracks and coalescence of microcracks. Propagation of subsurface secondary cracks led to remarkable crack branching observed on the specimen surface. The crack tip strain fields were measured by digital image correlation method, which gave a good monitoring of the crack branching process and helps a lot to understand the mechanism of crack branching behavior.
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