US 11,725,262 B2
Cemented carbide containing tungsten carbide and fine grained iron alloy binder
John J. Pittari, III, Nottingham, MD (US); Steven M. Kilczewski, Belcamp, MD (US); Jeffrey J. Swab, Fallston, MD (US); Kristopher A. Darling, Havre De Grace, MD (US); Billy C. Hornbuckle, Aberdeen, MD (US); Heather A. Murdoch, Baltimore, MD (US); and Robert J. Dowding, Abingdon, MD (US)
Assigned to The United States of America as represented by the Secretary of the Army, Washington, DC (US)
Filed by U.S. Army Research Laboratory ATTN: RDRL-LOC-I, Adelphi, MD (US)
Filed on Aug. 12, 2022, as Appl. No. 17/886,949.
Application 17/886,949 is a division of application No. 15/807,604, filed on Nov. 9, 2017, granted, now 11,434,549.
Claims priority of provisional application 62/420,332, filed on Nov. 10, 2016.
Prior Publication US 2023/0160042 A1, May 25, 2023
Int. Cl. C22C 29/02 (2006.01); B22F 3/105 (2006.01); C22C 29/08 (2006.01); B22F 3/14 (2006.01); C22C 29/06 (2006.01); C22C 1/051 (2023.01)
CPC C22C 29/02 (2013.01) [B22F 3/105 (2013.01); B22F 3/14 (2013.01); C22C 1/051 (2013.01); C22C 29/067 (2013.01); C22C 29/08 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of forming a tungsten carbide cemented body, the method comprising:
providing tungsten carbide; and
sintering a substantially cobalt-free binder comprising a dispersion strengthened, iron-based alloy that comprises iron, nickel and zirconium, wherein said cobalt-free binder is sintered with, and uniformly distributed around, the tungsten carbide,
wherein the sintered tungsten carbide and iron-based alloy comprises a hardness value of at least 15 GPa and a fracture toughness value of at least 11 MPa√m
and further wherein the iron-based alloy comprises a solid solution phase without a graphite.