High strength, high hardness tungsten heavy alloys with molybden

Details High strength, high hardness tungsten heavy alloys with molybden High strength, high hardness tungsten heavy alloys with molybden

1987-05-12

1989-01-31

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

419 47, 419 58, 420430, B22F 100

Patent

active

048013307

ABSTRACT:
A tungsten heavy alloy system is modified by partial replacement of the tungsten with substantial amounts of molybdenum ranging from 2% to 16% by weight to produce a new alloy with greater strength and hardness and moderate ductility. This new alloy is particularly useful for kinetic energy penetrators. The process involved is liquid phase sintering in an atmosphere of dry hydrogen, then wet hydrogen, then argon, followed by heat treament at 1100.degree. C. with a water quench. The resulting alloy is further hardened by swaging and strain aging which, at certain levels of molybdenum, produces a material having hardness in excess of HRC 45.

REFERENCES:
patent: 2793951 (1957-05-01), Green et al.
patent: 2843921 (1958-07-01), Ang
patent: 3656731 (1972-04-01), Larsen
patent: 3888636 (1975-06-01), Sczerzenie et al.
patent: 3929424 (1975-12-01), Krock et al.
patent: 3988118 (1976-10-01), Grierson
Canadian Mining and Metallurgical Bulletin for Apr. 1965, Montreal, Canada, E. I. Larsen and P. C. Murphy, Characteristics and Applications of High-Density Tungsten-Based Composites, pp. 413-421.
Powder Metallurgy International, vol. 5, No. 3, 197, Preparation and Properties of Heavy Metals, E. Ariel, J. Barta and D. Brandon, pp. 126-127.

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