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Environmentally Assisted Cracking of High Strength Beta Titanium Alloys.
Final rept. 15 Sep 91-15 Sep 94,
VIRGINIA UNIV CHARLOTTESVILLE SCHOOL OF ENGINEERING AND APPLIED SCIENCE
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The objective of this integrated research program is to define the conditions under which high strength Beta-titanium alloys resist environmentally assisted cracking EAC in marine environments. Specific goals are to 1 characterize EAC for metallurgical. chemical and mechanical conditions that could - destabilize crack tip passive films to promote local dissolution and hydrogen uptake, 2 test the hydrogen embrittlement mechanism for EAC, and 3 develop a mechanism-based model of EAC by integrating crack chemistry. surface dissolution and repassivation kinetics. hydrogen uptake to trap sites, and crack tip process zone micromechanics and damage. This final report presents a summary of the results and includes papers published during the period of this grant from September, 1951 to September, 1994.
APPROVED FOR PUBLIC RELEASE