Environment-induced crack growth can lead to premature failure of structural titanium alloys. In many cases, subcritical cracking is due to hydrogen. As a consequence, understanding the effects of hydrogen on crack growth susceptibility is important for the proper selection of alloys to be used in hydrogen and hydrogen-producing gaseous and aqueous environments. Of particular importance is the effect of microstructure. As the studies cited in this review consistently show, microstructure has a
strong effect on crack growth susceptibility of structural titanium alloys. This is most apparent when Ti3Al precipitation in...