公开(公告)号：US20220213584A1

公开(公告)日：2022-07-07

申请号：US17602605

申请日：2020-03-26

Applicant: GKN Sinter Metals, LLC

Inventor： David E. Lenhart, JR.

IPC: C23C8/22 ,  B22F3/17 ,  B22F3/10 ,  B22F5/08

Abstract: A method of carburizing a powder metal part involving more than one carburizing step. In a pre-forging carburizing step, a powder metal part that is less than fully dense is carburized to establish a pre-forging carburization profile. After the pre-forging carburizing step, the powder metal part is forged so that the powder metal part is increased in density and the pre-forging carburization profile is transformed into an as-forged carburization profile. In a post-forging carburizing step following the forging step, the powder metal part is again carburized, thereby resulting in both further diffusion of carbon from the as-forged carburization profile into the powder metal part and further introduction of carbon into the powder metal part at a surface of the powder metal part.