FURTHER INVESTIGATION OF NOTCH SENSITIVITY OF REFRACTORY METALS.
Abstract
The effects of commercially available coatings on the fracture toughness of a columbium alloy, D43, and a molybdenum alloy, TZM, were studied in Phase I. The 30-mil sheet alloys TZM and D43 were coated with Chromalloy W-3 and TRW (Cr-Ti-Si), respectively. Test results on as-coated specimens and specimens that were coated and exposed in air at elevated temperature revealed that there was no serious deterioration in notch strength or fracture toughness. The notch sensitivity and brittleness of molybdenum sheet were studied in Phase II by the following related investigations: (1) the effect of strain rate on the flow and fracture of molybdenum; (2) determination of the limiting temperature for the propagation of a brittle crack, by use of a modified Robertson 'crack arrest' test; and (3) application of the Moire technique to study local strains at the root of a notch. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1965
- Accession Number
- AD0475016
Entities
People
- A. Gilbert
- B. A. Wilcox
- C. W. Marschall
- F. C. Holden
Organizations
- Battelle Memorial Institute