公开(公告)号：US20220195550A1

公开(公告)日：2022-06-23

申请号：US17133251

申请日：2020-12-23

Applicant: Caterpillar Inc.

Inventor： Matthew Thomas Kiser ,  Lindsey S. Cavanaugh ,  Thomas Marshall Congdon ,  Susan Marie Graham ,  Tianjun Liu ,  Mark David Veliz ,  Thomas John Yaniak

IPC: C21D9/04 ,  C21D8/00 ,  B62D55/205 ,  C21D6/00 ,  C21D1/84 ,  C21D7/13 ,  C22C38/02 ,  C22C38/04

Abstract: An example track shoe, cutting edge, or other component of a machine is formed in a heated process, such as hot-rolling followed by air-hardening. The air-hardening process involves cooling the component by flowing air over the component (e.g., air cooling), such that the component is cooled at a controlled rate. During the air-cooling process, such as in the range of about 250° C. to about 1100° C., the component may be machined, such as by shearing, punching, drilling, etc. The machining may form the final shape of the component. As the air-hardening process is completed, and the component approaches room temperature, the component may have at least 5% bainitic crystal composition, and as high as greater than 80% bainitic crystal composition, resulting in relatively high hardness and fracture toughness. The final track shoe may have a hardness between about 40 HRC and 55 HRC.