公开(公告)号：US20240052445A1

公开(公告)日：2024-02-15

申请号：US17965312

申请日：2022-10-13

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC ,  NORTHEASTERN UNIVERSITY

Inventor： Zhisong CHAI ,  Tingdong REN ,  JinLong ZHU ,  Wei XU ,  Jianfeng WANG

IPC: C21D1/673 ,  C21D1/18 ,  B21D22/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18

CPC classification number: C21D1/673 ,  C21D1/18 ,  B21D22/022 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18 ,  C21D2211/008 ,  C21D2211/001

Abstract: A method for preparing a press-hardened steel component is provided. The method includes forming a heated blank by heating a steel alloy blank to a first temperature in a first zone of a furnace having two or more zones, and after the heating of the steel alloy blank to the first temperature, heating the steel alloy blank to a second temperature in a second zone of the furnace. The second temperature is greater than the first temperature. The first zone has a first flow rate for a protective gas, and the second zone has a second flow rate for the protective gas that is greater than the first flow rate. The method further includes stamping and quenching the heated blank at a constant rate to a temperature between a martensite finish temperature of the steel alloy defining the steel alloy blank and room temperature to form the press-hardened steel component.