Accession Number : AD0815504

Title :   DEVELOPMENT OF BAR PROCESS FOR TD NICKEL-MOLYBDENUM ALLOY.

Descriptive Note : Summary rept. 1 Jul 65-31 Dec 66,

Corporate Author : DU PONT DE NEMOURS (E I) AND CO WILMINGTON DE

Personal Author(s) : Barnett, William J.

Report Date : MAR 1967

Pagination or Media Count : 141

Abstract : A manufacturing process was developed for the production of 1-in.-diam. TDNiM (Ni-20%Mo-3%ThO2-0.30%Zr-0.01%C) alloy bar. The product bar was sound, uniform in quality and properties, and exhibited the highest intermediate temperature strength obtained to date in dispersion hardened alloy bar products of similar size. The bar process developed was the hot rotary GFM forging of as-extruded bar. The major factors which contributed to strength reproducibility were control of minor element chemistry, product purity and uniformity of microstructure. Rupture strength was influenced by thoria size, matrix grain size, and carbon level. Manufacturing changes adopted to achieve property reproducibility caused both thoria growth and carbon loss which reduced strength below the target properties.

Descriptors :   (*NICKEL ALLOYS, FORGING), (*FORGING, RODS), POWDER METALLURGY, MOLYBDENUM ALLOYS, THORIUM COMPOUNDS, DIOXIDES, ZIRCONIUM ALLOYS, CARBON ALLOYS, ROLLING(METALLURGY), EXTRUSION, RUPTURE, MICROSTRUCTURE, HARDNESS, TENSILE PROPERTIES, DUCTILITY.

Subject Categories : Properties of Metals and Alloys
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE