Stress Corrosion Cracking Susceptibility of Beta Titanium Alloy 38-6-44:Candidate Alloy for Scout Torsion Bar.

摘要

The threshold stress itensities for stress corrosion crack propagation in beta titanium alloy 38-6-44,Ti-3Al-8V-6Cr-4Mo-4Zr,has been determined in salt water and methanolic solutions. The alloy was immune to stress corrosion cracking in aqueous sodium chloride solutions (marine environment). However,in methanolic solutions,the alloy was very susceptible to SCC. This marked susceptibility in methanolic solutions can be mitigated by the addition of sodium nitrate as an inhibitor. Crack extension in the alloy was transgranular and failure occurred by brittle quasicleavage in methanolic solutions. (Author)