BERYLLIUM CASTING--PHASE II. Interim Technical Engineering Report No. 5 for Period September 20 to December 19, 1959

Technical Report · Mon Oct 31 04:00:00 EST 1960

OSTI ID:4144942

Cohen, P M; Harris, R C

The effects of superheat and the rate of cooling on beryllium ingot structure were investigated. This was done by pouring a series of heats, each with a varying degree of superheat, into a composite preheated mold. The results indicate tbat the columnar grain size was reduced appreciably from that exhibited by ingots made in previously completed portions of this program. The grain size of the former ingots seems to be unaffected, on a macrographic scale at least, by the thermal conditions imposed. The grain size does not appear to be sensitive to the different mold materials employed, although a slight structure gradient was observed from top to bottom of the ingots cast. Hardness readings were found to be unreliable due to metal cracking near the test indentation. Research on the effects of germanium as an alloying addition and tantalum nitride and tungsten carbide as inoculants was initiated during this quarter. Extensive equipment modifications were undertaken to facilitate these areas of study. (auth)

• Research Organization: Beryllium Corp., Reading, Penna.
• NSA Number: NSA-14-012895
• OSTI ID: 4144942
• Report Number(s): NP-8552
• Country of Publication: United States
• Language: English

Related Subjects

BERYLLIUM
CASTING
GERMANIUM ALLOYS
GRAIN SIZE
HARDNESS
HEAT TREATMENTS
MELTING
METALS, CERAMICS, AND MATERIALS
MIXING
TANTALUM NITRIDES
TUNGSTEN CARBIDES