Abstract
Small fatigue crack growth tests in 3%NaCl solution were conducted on a solution-treated and aged material and two kinds of annealed materials of Ti-6Al-4V alloy. The crack growth rate in 3%NaCl solution was enhanced above a certain value of δK compared with that in air. The difference in crack growth rate between small and long cracks was not observed for all the microstructures studied, and so no specific chemical behavior appeared in short cracks. The effect of specimen orientation on crack growth was not found in air, while in 3%NaCl solution the crack growth rate in T-orientation for which load was applied normal to the rolling direction was faster than that in L-orientation. From fractographic observations, cleavage fracture was observed remarkably with increasing crack growth rate.
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