Mechanisms for the Hydrogen Environment Embrittlement Resistance of High StrengthAlloys

摘要

The objectives of this research are to: (1) identify conditions under which highstrength beta titanium alloys and Fe-Ni-based superalloys resist environment assisted cracking (EAC) in marine environments; (2) characterize EAC initiation and propagation versus metallurgical, chemical, and mechanical variables that may destabilize the crack tip passive film to promote both dissolution and hydrogen uptake; (3) test the hydrogen embrittlement mechanism; and (4) model EAC by integrating crack chemistry, surface repassivation kinetics, hydrogen uptake to trap sites, and crack tip process zone damage. This report summarizes the results obtained for FY 96 and includes papers published or prepared during the period from September, 1995 to September 1996.