Environmentally Assisted Cracking of High Strength Beta Titanium Alloys
Abstract
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. This work is detailed in the attached paper: L.M. Young, G.A. Young, Jr., J.R. Scully and R.P. Gangloff, 'Aqueous Environment Enhanced Crack Propagation in High Strength Beta Titanium Alloys', Metall. Trans. A, in review, 1993. Titanium alloys, Hydrogen embrittlement, Mechanical properties, Intergranular cracking, Cracking, Microstructure, Alpha precipitates, Beta phase, hydrides, Passive film, Beta titanium alloys, Fracture threshold.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1993
- Accession Number
- ADA273598
Entities
Organizations
- University of Virginia