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

Personal Author(s) : Begley, R. T. ; Godshall, J. L. ; Harrod, D. L.

Report Date : JAN 1966

Pagination or Media Count : 139

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)

Descriptors :   (*NIOBIUM ALLOYS, GAS TURBINE BLADES), NITROGEN, CARBON ALLOYS, TANTALUM ALLOYS, RHENIUM, TUNGSTEN, MECHANICAL PROPERTIES, HARDNESS, TENSILE PROPERTIES, LOW TEMPERATURE, HIGH TEMPERATURE, HEAT TREATMENT, ANNEALING, DEFORMATION, EXTRUSION, METALLOGRAPHY, HELIUM, ALLOYS, OXIDATION, RUPTURE, REFRACTORY METAL ALLOYS, SHOCK RESISTANCE, FATIGUE(MECHANICS), STRESSES, COATINGS.

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE