公开(公告)号：US11612926B2

公开(公告)日：2023-03-28

申请号：US17251655

申请日：2018-06-19

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Jiachen Pang ,  Qi Lu ,  Jianfeng Wang

IPC: B21D22/02 ,  C21D1/673 ,  C21D1/19 ,  C21D1/76 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C21D6/00

Abstract: A method of forming a shaped steel object is provided. The method includes cutting a blank from an alloy composition including 0.05-0.5 wt. % carbon, 4-12 wt. % manganese, 1-8 wt. % aluminum, 0-0.4 wt. % vanadium, and a remainder balance of iron. The method also includes heating the blank until the blank is austenitized to form a heated blank, transferring the heated blank to a press, forming the heating blank into a predetermined shape to form a stamped object, and decreasing the temperature of the stamped object to a temperature between a martensite start (Ms) temperature of the alloy composition and a martensite final (Mf) temperature of the alloy composition to form a shaped steel object comprising martensite and retained austenite.

公开(公告)号：US20250066868A1

公开(公告)日：2025-02-27

申请号：US18468256

申请日：2023-09-15

Applicant: GM Global Technology Operations LLC

Inventor： Sarah Tedesco ,  Mingfeng Shi ,  Jianfeng Wang ,  Zhou Wang ,  Jason J. Coryell ,  Jiachen Pang ,  Zhen Chen ,  Shane Michael Anderson ,  Daniel Baker

IPC: C21D1/42 ,  C21D6/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/18

Abstract: A method to achieve variable properties of a component using a coating free press hardened steel comprises: transferring a blank of a coating free press hardened steel (CFPHS) material having base blank properties into a heating unit having multiple induction heating coils; heating the blank within the heating unit to create a modified blank having differing modified blank properties throughout the modified blank compared to base blank properties; moving the modified blank out of the heating unit into a die; and forming a shaped part by operation of the die creating a finished CFPHS part.

公开(公告)号：US20250154635A1

公开(公告)日：2025-05-15

申请号：US18906347

申请日：2024-10-04

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Henry ZHAN ,  Jiachen Pang ,  Michael Bugeaud

IPC: C22F1/047 ,  B22D11/00 ,  B22D11/06 ,  C22C1/02 ,  C22C1/03 ,  C22C21/08

Abstract: A method of manufacturing aluminum sheet material includes melting secondary aluminum and adding primary aluminum and other alloying elements to the melt to achieve an alloy composition of from 2.5 wt % to 6.3 wt % Mg, from 0.6 wt % to 2.5 wt % Si, from 0.2 wt % to 0.4 wt % Fe, from 0.05 wt % to 0.2 wt % Cr, up to 0.6 wt % Mn, up to 0.1 wt % Cu, up to 0.1 wt % Zn, the balance being Al and unavoidable impurities, wherein the Si and Mg contents satisfy the relationship (Si wt. %>0.5*Mg wt. %-0.65 wt. %). The alloy is then continuously cast into an aluminum sheet. Aluminum sheet material made according to the process, and an aluminum alloy adapted for the process are also disclosed.

公开(公告)号：US11951522B2

公开(公告)日：2024-04-09

申请号：US18123592

申请日：2023-03-20

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Jiachen Pang ,  Qi Lu ,  Jianfeng Wang

IPC: B21D22/02 ,  C21D1/19 ,  C21D1/673 ,  C21D1/76 ,  C21D6/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14

CPC classification number: B21D22/022 ,  C21D1/19 ,  C21D1/673 ,  C21D1/76 ,  C21D6/005 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C21D2211/001 ,  C21D2211/008

Abstract: A method of forming a shaped steel object is provided. The method includes cutting a blank from an alloy composition including 0.05-0.5 wt. % carbon, 4-12 wt. % manganese, 1-8 wt. % aluminum, 0-0.4 wt. % vanadium, and a remainder balance of iron. The method also includes heating the blank until the blank is austenitized to form a heated blank, transferring the heated blank to a press, forming the heating blank into a predetermined shape to form a stamped object, and decreasing the temperature of the stamped object to a temperature between a martensite start (Ms) temperature of the alloy composition and a martensite final (Mf) temperature of the alloy composition to form a shaped steel object comprising martensite and retained austenite.

公开(公告)号：US11613789B2

公开(公告)日：2023-03-28

申请号：US17058464

申请日：2018-05-24

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Qi Lu ,  Jiachen Pang

IPC: C21D1/673 ,  C21D1/74 ,  C21D9/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  B21D22/02

Abstract: A method of forming a shaped steel object, includes cutting a blank from an alloy composition. The alloy composition includes 0.1-1 wt. % carbon, 0.1-3 wt. % manganese, 0.1-3 wt. % silicon, 1-10 wt. % aluminum, and a balance being iron. The method also includes heating the blank to a temperature above a temperature at which austenite begins to form to generate a heated blank, transferring the heated blank to a die, forming the heated blank into a predetermined shape defined by the die to generate a shaped steel object, and decreasing the temperature of the shaped steel object to ambient temperature. The heating is performed under an atmosphere comprising at least one of an inert gas, a carbon (C)-based gas, and nitrogen (N2) gas.