High density tungsten-nickel-iron-cobalt alloys having improved hardness and method for making same

Patent · Tue Aug 09 00:00:00 EDT 1988

OSTI ID:6164236

Penrice, T W; Bost, J

This patent describes the process of making high density alloy containing about 85 to 98 weight percent tungsten and the balance of the alloy being essentially a binder of nickel, iron and cobalt, and wherein the cobalt is present in an amount within the range of about 5 to 47.5 weight percent of the binder, comprising: blending powders of the tungsten, nickel, iron and cobalt into a homogeneous composition, compacting the homogeneous composition into a shaped article, heating the shaped article to a temperature and for a time sufficient to sinter the article, subjecting the sintered article to a temperature sufficient to enable the intermetallic phase formed at the matrix to tungsten interface to diffuse into the gamma austenitic phase whereby the alpha tungsten/gamma austenite boundaries are essentially free of such intermetallic phase, quenching the article, and swaging the article to a reduction in area of about 5 to 40 percent, the article having improved mechanical properties, including improved tensile strength and hardness while maintaining suitable ductility for subsequent working thereof.

• Assignee: Teledyne Industries, Inc., Los Angeles, CA
• Patent Number(s): US 4762559
• Application Number: TRN: 89-009493
• OSTI ID: 6164236
• Resource Relation: Patent File Date: Filed date 30 Jul 1987
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT ALLOYS
IRON ALLOYS
NICKEL ALLOYS
TUNGSTEN ALLOYS
BINDERS
COMPACTING
DENSITY
FABRICATION
HARDNESS
HEATING
POWDER METALLURGY
QUANTITY RATIO
QUENCHING
SINTERING
SYNTHESIS
ALLOYS
MECHANICAL PROPERTIES
METALLURGY
PHYSICAL PROPERTIES
360103* - Metals & Alloys- Mechanical Properties
360101 - Metals & Alloys- Preparation & Fabrication