Environmentally assisted cracking of high strength beta titanium alloys. Annual report, 15 September 1992-15 September 1993

Technical Report · Mon Nov 01 04:00:00 EST 1993

OSTI ID:5454241

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 (H) 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. The following conclusions were established in FY 93 based on rising load fracture mechanics experiments with solution treated and peak aged Ti-15-3 (15V-3Cr-3A1-3Sn; wt%) and Beta 21S (Ti- 15Mo-3Nb-3Al; wt%) in aqueous NaCl.

• Research Organization: Virginia Univ., Charlottesville, VA (United States). Dept. of Materials Science and Engineering
• OSTI ID: 5454241
• Report Number(s): AD-A-273598/3/XAB; CNN: N00014-91-J-4164
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CORROSION
DOCUMENT TYPES
EMBRITTLEMENT
FRACTURE MECHANICS
HYDROGEN EMBRITTLEMENT
MECHANICS
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
PROGRESS REPORT
TIN ALLOYS
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
VANADIUM ALLOYS