公开(公告)号：US20230226585A1

公开(公告)日：2023-07-20

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 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C21D6/00

CPC classification number: B21D22/022 ,  C21D1/19 ,  C21D1/673 ,  C21D1/76 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C21D6/005 ,  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：US20220356540A1

公开(公告)日：2022-11-10

申请号：US17556183

申请日：2021-12-20

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Qi LU ,  Jianfeng WANG ,  Congjie WANG ,  Qingquan LAI

IPC: C21D1/18 ,  C21D8/00

Abstract: A steel composition is provided. The steel composition includes 0.02-0.45 wt. % carbon (C), 0-8 wt. % manganese (Mn), 0-8 wt. % nickel (Ni), 11-17 wt. % chromium (Cr), 1-3 wt. % silicon (Si), and a balance of iron (Fe). The combined concentration of the Mn and Ni is 2-8 wt. %. The steel composition is configured to form a surface oxide layer including oxides of at least one of the Cr or the Si after being subjected to press hardening. Press-hardened steel (PHS) fabricated from the steel composition and a method of fabricating a (PHS) component from the steel composition are also provided.

公开(公告)号：US20210222265A1

公开(公告)日：2021-07-22

申请号：US17153848

申请日：2021-01-20

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Qi LU ,  Jianfeng WANG ,  Shane M. ANDERSON ,  Curt D. HORVATH ,  Jason J. CORYELL

IPC: C21D6/00 ,  C22C38/38 ,  C22C38/34 ,  C22C38/20 ,  C21D1/18 ,  C21D9/46 ,  C21D8/00

Abstract: A steel composition is provided. The steel composition includes 0.1-0.45 wt. % carbon (C), greater than 0-4.5 wt. % manganese (Mn), 0.5-5 wt. % chromium (Cr), 0.5-2.5 wt. % silicon (Si), greater than 0-2 wt. % copper (Cu), and a balance of iron (Fe). The combined concentration of the Mn, Cr, and Cu is greater than about 2 wt. %. The steel composition is configured to form a surface oxide layer comprising oxides of Cr, Si, and Cu after being subjected to press hardening. Press-hardened steel fabricated from the steel composition and a method of fabricating a press-hardened steel component from the steel composition are also provided.

公开(公告)号：US20210198760A1

公开(公告)日：2021-07-01

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.

公开(公告)号：US20200063232A1

公开(公告)日：2020-02-27

申请号：US16461650

申请日：2016-12-16

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Qi LU ,  Jianfeng WANG

IPC: C21D9/46 ,  C23C8/10 ,  C22C38/38 ,  C22C38/32 ,  C22C38/06 ,  C22C38/02 ,  C21D6/00

Abstract: An alloy composition comprises that carbon at a concentration of from greater than or equal to about 0.15% by weight to less than or equal to about 0.5% by weight of the alloy composition, manganese at a concentration of from greater than or equal to about 0.1% by weight to less than or equal to about 3% by weight of the alloy composition; silicon at a concentration of from greater than or equal to about 0.1% by weight to less than or equal to about 0.5% by weight of the alloy composition; either: chromium at a concentration of from greater than or equal to about 2% by weight to less than or equal to about 10% by weight of the alloy composition and aluminum at a concentration of from greater than or equal to about 0% by weight to less than or equal to about 5% by weight of the alloy composition, or aluminum at a concentration of from greater than or equal to about 2% by weight to less than or equal to about 10% by weight of the alloy composition and chromium at a concentration of from greater than or equal to about 0% by weight to less than or equal to about 5% by weight of the alloy composition; and a balance of the alloy composition being iron. Also discloses an alloy composition and a method of producing a press hardening steel object.

公开(公告)号：US20230317966A1

公开(公告)日：2023-10-05

申请号：US17853690

申请日：2022-06-29

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Zhe LI ,  Qi LU ,  Yong LU ,  Meiyuan WU ,  Qili SU ,  Haijing LIU

IPC: H01M4/76 ,  H01M10/0525 ,  H01M10/0562 ,  H01M10/44 ,  H01M4/62 ,  H01M4/134

CPC classification number: H01M4/762 ,  H01M10/0525 ,  H01M10/0562 ,  H01M2004/027 ,  H01M4/626 ,  H01M4/625 ,  H01M4/134 ,  H01M10/44

Abstract: An electrochemical cell that cycles lithium ions includes a positive electrode, a negative electrode current collector spaced apart from the positive electrode, and an ionically conductive electrolyte disposed between the positive electrode and the negative electrode current collector. The negative electrode current collector is of unitary one-piece construction and has a three-dimensional porous structure that defines an interconnected network of open pores. During charging of the electrochemical cell, lithium metal is deposited within the open pores of the negative electrode current collector.

公开(公告)号：US20230140215A1

公开(公告)日：2023-05-04

申请号：US17740472

申请日：2022-05-10

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Qi LU ,  Jianfeng WANG ,  Zhisong CHAI ,  Wei XU

IPC: C21D9/46 ,  C21D1/673 ,  C22C38/48 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C21D6/00 ,  B21D22/02

Abstract: Methods include pressing and quenching a heated blank in a die to form the shaped steel object. A first portion of the heated blank is selectively cooled at a first cooling rate and a second portion of the heated blank selectively cooled at a lower second cooling rate. The shaped steel object has an alloy with wt. % of chromium at ≥about 0.5 to ≤about 6; carbon at ≥about 0.01 to ≤about 0.5; manganese at ≥about 0 to ≤about 3; silicon at ≥about 0.5 to ≤about 2; nitrogen at ≥0 to ≤about 0.01; nickel at ≥0 to ≤about 5; copper at ≥0 to ≤about 5; molybdenum at ≥0 to ≤about 5; vanadium at ≥0 to ≤about 1%; niobium at ≥0 to ≤about 0.1; and a balance being iron.

公开(公告)号：US20220407079A1

公开(公告)日：2022-12-22

申请号：US17698865

申请日：2022-03-18

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Qi LU ,  Zhe LI

IPC: H01M4/66 ,  H01M4/04

Abstract: The present disclosure provides a method for forming a bipolar current collector. The method may include heating a first current collector material having a first melting point to form a molten metal or metal alloy and disposing the molten metal or metal alloy on one or more surfaces of a second current collector material having a second melting point greater than the first melting point to form the bipolar current collector. The molten metal or metal alloy may be disposed on the one or more surfaces of the second current collector material using a twin-roll casting method or a spraying method. The bipolar current collector may include a first current collector including the first current collector material, a second current collector including the second current collector material, and an inter-diffusion layer that connects the first current collector and the second current collector.

公开(公告)号：US20230111725A1

公开(公告)日：2023-04-13

申请号：US17725813

申请日：2022-04-21

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Mingfeng SHI ,  Sarah TEDESCO ,  Qi LU ,  Jason J. CORYELL ,  Jianfeng WANG

IPC: B23K26/26 ,  C21D9/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/04 ,  C22C38/02 ,  C21D6/00 ,  B21D22/02

Abstract: A hot formed joined blank includes a first metal blank having an ultimate tensile strength of ≥about 1300 MPa to ≤about 2000 MPa and defining a first surface, a second metal blank having an ultimate tensile strength of ≥about 400 MPa to ≤about 1200 MPa and defining a second coated surface having a coating disposed thereon. The coating includes aluminum and silicon or in alternative variations, zinc. A third surface of the second metal blank is joined to the first surface of the first metal blank to form the hot formed joined blank. A weld nugget is disposed along a boundary between the first and second metal blanks that is configured to join the first and second metal blanks, where the weld nugget optionally includes less than or equal to about 1.5 weight percent aluminum or a microstructure comprising austenite and delta-ferrite.

公开(公告)号：US20210087661A1

公开(公告)日：2021-03-25

申请号：US16958362

申请日：2017-12-28

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Qi LU ,  Jiachen PANG ,  Jianfeng WANG

IPC: C22C38/54 ,  C22C38/46 ,  C22C38/44 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/48 ,  B21D22/02 ,  C21D9/00

Abstract: An alloy composition is provided. The alloy composition includes chromium (Cr) at a concentration of greater than or equal to about 0.5 wt. % to less than or equal to about 9 wt. %, carbon (C) at a concentration of greater than or equal to about 0.15 wt. % to less than or equal to about 0.5 wt. %, manganese (Mn) at a concentration of greater than or equal to about 0 wt. % to less than or equal to about 3 wt. %, silicon (Si) at a concentration of greater than or equal to about 0.5 wt. % to less than or equal to about 2 wt. %, and a balance of the alloy composition being iron. Methods of making shaped steel objects from the alloy composition are also provided.