Abstract
A study is made of crack initiation under high cycle fatigue loading for the metastable beta alloy Ti-8 Mo-8V-2Fe-3Al, focusing on the influence of beta grain size. It was shown that cracks initiate and grow in the beta grain boundary by a void formation and coalescence process. Comparison of S-N fatigue curves for materials of different reduction and grain size suggests that beta grain size is very influential in determining fatigue strength of metastable beta Ti alloys. (SDF)
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