Fracture Toughness and Stress Corrosion Resistance of U-0.75 wt% Ti
Abstract
As a consequence of the several in-bore failures of the XM774 projectile during low temperature firing, an intensive fracture toughness study of the U-0.75 wt% Ti core material was carried out. Fracture toughness measurements in the temperature range of -100 deg F to +100 deg F were made for the alloy processed by (1) alpha extrusion, gamma vacuum solutionizing, directionally quenching in H2O, aging; (2) gamma rolling, gamma solutionizing in NUSAL. Plunge quenching in oil, aging; (3) resolutionizing in vacuum the material processed in (2), directionally quenching in H2O and re-aging. Two types of fracture toughness specimens were considered. Based on preliminary test data, a slow-bend precracked Charpy specimen was selected for final measurements. Data obtained was compared with the meager fracture toughness data for the alloy reported in the literature. In cooperation with ARDEC, extensive fracture toughness data was obtained for core material supplied by several suppliers of XM774 penetrators. Based on these data, a minimum fracture toughness requirement at -50 deg F was recommended for incorporation in the procurement specification. K(Iscc) measurements were also made and the data compared with previously reported results.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1993
- Accession Number
- ADA271840
Entities
People
- Chester V. Zabielski
- Milton Levy
Organizations
- United States Army Research Laboratory