Investigation of the Kinetics and Mechanism of Subcritical Crack Growth by Delayed Failure of Titanium Alloys In and Out of Corrosive Environments

The kinetics of crack growth by SCC of titanium alloys in some solutions have been studied by the electrical resistivity method. The effect of cathodic polarization on crack growth rate was used for investigation of the mechanism of SCC of titanium alloys in different conditions. The hydrogen diffusion model is proposed to describe the kinetics of delayed failure of titanium alloys in the absence of a corrosive environment. According to this model, it is possible to determine D_H from kinetic data. The subcriticai crack growth mechanism in the absence of a corrosive environment is shown to be internal hydrogen embrittlement.