Fracture Toughness and Stress Corrosion Resistance of U-O.75 wt% Ti.
Abstract
Late in 1978, ARL-MD, Watertown was asked to participate in an investigation of several failures on launch of depleted-uranium cored XM774 rounds during low temperature firing. Failure occurred in the vicinity of the rear-most buttress groove of the core where the fillet stress approximates the yield strength of the U-0.75 wt% Ti core alloy. A simple fracture mechanics approach suggested that poor low temperature fracture toughness of the core alloy was contributory. As a consequence, a systematic investigation of the fracture toughness of the currently produced U-0.75 wt% Ti core alloy was carried out. The U-0.75 wt% Ti alloy was provided by National Lead of Ohio (NLO) and Battelle Northwest (BNW). The failed cores were processed by NLO. The XM833 U-0.75 wt% Ti core material was also obtained from Rocky Flats (RF) for comparison. Representative cores from each source were fully characterized and Processing parameters, mechanical properties, microstructure, and test temperature were correlated with fracture toughness.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 23, 1994
- Accession Number
- ADA331074
Entities
People
- Chester V. Zabielski
- Milton Levy
Organizations
- United States Army Research Laboratory