DEVELOPMENT OF COLUMBIUM BASE ALLOYS.
Abstract
An experimental program was carried out aimed at developing high strength Nb-base alloys for possible gas turbine bucket applications. The Nb-W-Hf-C system was selected for evaluation. Alloys in the high temperature annealed condition provided the best creep rupture strength over the temperature range investigated 1095 C (2000 F) to 1315 C (2400 F). Material in the wrought plus stress-relieved condition had much lower creep strength. Alloy VAM-80 (Nb-28W-2Hf-0.13C) exhibited the best creep-rupture properties at 1315 C (2400 F). This alloy had a 100-hour rupture strength of 27,500 psi, corresponding to a strength-density ratio of 74,000 inches. Ultimate tensile strength at 1315 C (2400 F) was 55,000 psi. Detailed metallographic and phase identification studies were carried out in an attempt to correlate structure with observed mechanical properties. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1966
- Accession Number
- AD0477795
Entities
People
- D. L. Harrod
- J. L. Godshall
- R. T. Begley