FEASIBILITY STUDY OF COLUMBIUM ALLOY CASTINGS.
Abstract
The quarterly progress report is the second in a series describing a program to determine the feasibility of investment-casting columbium alloys. Thirty-four castings are scheduled to be produced using consumable arc remelting and tungsten-lined molds to prevent mold-metal reaction. The Phase I program objective is to optimize the mold design and mold preheat temperature in preparation for the Phase II production of usable castings for mechanical and environmental testing. Five fluidity molds of alloy B-66 were produced, all in unheated molds with two, three, and four tungsten interface layers. In all cases the fluidity was poor, and obvious surface contamination was observed in the downsprues of the four-layer molds. The downsprue of the two-layer B-66 mold was contaminated throughout. Six fluidity castings of alloy WC-3015 were made with heated and unheated molds with two and three tungsten layers. Fluidity was improved by heating the molds and by reducing the number of tungsten layers. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1970
- Accession Number
- AD0708920
Entities
People
- J. J. Walters