Accession Number:

AD0477795

Title:

DEVELOPMENT OF COLUMBIUM BASE ALLOYS.

Descriptive Note:

Summary rept. 15 May 64-15 Aug 65,

Corporate Author:

WESTINGHOUSE ASTRONUCLEAR LAB PITTSBURGH PA

Report Date:

1966-01-01

Pagination or Media Count:

139.0

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

Subject Categories:

  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE