DEVELOPMENT OF TUNGSTEN-BASE ALLOYS
Abstract
Arc-cast W-base binary alloy ingots were prepared with 0.0 to 2.7% Co; 0.0 to 11.7% Nb; 0.0 to 3.6% Hf; 0.0 to 18.1% Ta; 0.0 to 9.3% V; and 0.0 to 3.8% Zr. Studies were made of the effects of alloy additions on the lattice parameter, macrostructure, microstructure, hardness, oxidation resistance at 2000F, and forgeability. Vanadium caused a contraction of the W lattice, Co causedA SLIGHT EXPANSION, AND THE OTHER ELEMENTS CAUSED A MARKED EXPANSION OF LATTICE. The limit of solid solubility of Zr in W was about 0.75 wt-%; limited solid solubility of Co and Hf was indicated by metallographic examination, but was not confirmed by lattice parameter measurements. In descending order of effect on elevated temperature hardness are Co, Zr, Hf, V, Nb, and Ta. Co and V additions increased the oxidation rate of W, while insignificant rate reductions were observed for additions of Nv, Hf, Ta, and Zr. None of the forging test specimens were completely crack free.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 20, 1961
- Accession Number
- AD0259132
Entities
People
- M. Semchyshen.
- Robert Q. Barr