US 11,806,799 B1
Sinter brazing of powdered metal sinter hard matertial component to a wrought steel component
Peter G. Imbrogno, Dubois, PA (US); and Kevin A. Bauer, St. Marys, PA (US)
Assigned to Keystone Powdered Metal Company, St. Marys, PA (US)
Filed by Keystone Powdered Metal Company, St. Marys, PA (US)
Filed on Apr. 15, 2021, as Appl. No. 17/231,362.
Claims priority of provisional application 63/011,238, filed on Apr. 16, 2020.
Int. Cl. B23K 1/19 (2006.01); C22C 30/02 (2006.01); C22C 38/22 (2006.01); C22C 38/20 (2006.01); C22C 38/04 (2006.01); B23K 35/30 (2006.01); C21D 6/00 (2006.01); C22C 38/08 (2006.01); B23K 103/04 (2006.01)
CPC B23K 1/19 (2013.01) [B23K 35/302 (2013.01); B23K 35/3033 (2013.01); C21D 6/001 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C22C 30/02 (2013.01); C22C 38/04 (2013.01); C22C 38/08 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); B23K 2103/04 (2018.08)] 20 Claims
 
1. A method of manufacturing a desired metal part which comprises (1) providing a powder metal sinter hard steel component and a wrought steel stamping component; (2) affixing the powder metal sinter hard steel component and the wrought steel stamping component together with a brazing filler metal being alloyed at the interface between the powder metal sinter hard steel component and the wrought steel stamping component; (3) sinter brazing and sinter hardening the powder metal sinter hard steel component and the wrought steel stamping component together to produce an in-process
metal part, wherein the sinter brazing and sinter hardening is carried out under conditions that include a preheating step, a main heating step, and a rapid cooling step, wherein the preheating step is carried out at a temperature which is within the range of 1550° F. to 1750° F., wherein the main heating step is carried out at a temperature which is above the melting point of the brazing filler metal at a temperature which is within the range of 2040° F. to 2100° F.; and (4) tempering the in-process metal part to produce the desired metal part.