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.

公开(公告)号：US20240033816A1

公开(公告)日：2024-02-01

申请号：US17947769

申请日：2022-09-19

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC ,  Easyforming Steel Technology Co Ltd

Inventor： Zhou WANG ,  Hongliang YI ,  Jianfeng WANG ,  Lianqian LIU

IPC: B22D17/22 ,  B22D17/08 ,  C22C38/16 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04

CPC classification number: B22D17/2209 ,  B22D17/08 ,  C22C38/16 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04

Abstract: A die casting mold may be made of an iron alloy including, by mass: about 1% to about 6% nickel, about 0.1% to about 5% copper, about 0.2% to about 2.5% aluminum, about 0.5% to about 2% manganese, and about 0.05% to about 0.2% carbon. The iron alloy may be formed into an initial shape of the die casting mold, heated to a temperature greater than or equal to about 900° C. and then cooled to form a supersaturated solid solution of iron and dissolved alloying elements. Then, the iron alloy may be heated at a temperature sufficient to precipitate intermetallic nanoparticles from the supersaturated solid solution to form an intermetallic precipitate phase dispersed throughout an iron-based matrix phase. A layer of iron alloy material disposed at and along a surface of the iron alloy may exhibit a deformed microstructure indicative of a machining direction.

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：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：US20250075301A1

公开(公告)日：2025-03-06

申请号：US18788958

申请日：2024-07-30

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Zhou WANG ,  Jiachen PANG ,  Lianqian LIU ,  Hongliang YI ,  Jianfeng WANG

IPC: C22C38/42 ,  C21D1/18 ,  C21D6/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/48 ,  C23C8/28

Abstract: A tool steel comprises iron (Fe); carbon (C) in a range from 0.001 wt % to 0.1 wt %; copper (Cu) in a range from 0.2 wt % to 2.0 wt %; nickel (Ni) in a range from 3 wt % to 10 wt %; aluminum (Al) in a range from 0.5 wt % to 3 wt %; manganese (Mn) in a range from 0.2 wt % to 1.5 wt %; chromium (Cr) in a range from 0 to 1.5 wt %; molybdenum (Mo) in a range from 0 to 1.5 wt %; tungsten (W) in a range from 0 to 1.5 wt %; and niobium (Nb) in a range from 0 to 0.2 wt %. A transition layer is arranged on the steel substrate. Metal of the transition layer includes Ni in a range from 5 to 20 wt % copper in a range from 1 to 5 wt %. One of an oxide layer and an oxide/nitride layer is arranged on the transition layer.

公开(公告)号：US20250073770A1

公开(公告)日：2025-03-06

申请号：US18777243

申请日：2024-07-18

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Zhou WANG ,  MingFeng SHI ,  Sarah TEDESCO ,  Shane Michael ANDERSON ,  Jason J. CORYELL ,  Daniel BAKER ,  Jianfeng WANG ,  Jiachen PANG ,  Zhen CHEN

IPC: B21D22/02 ,  C21D9/00

Abstract: A method for manufacturing a coating-free press hardening steel (CFPHS) component comprises heating a CFPHS blank at a first predetermined heating rate to a first predetermined temperature in a first predetermined temperature range using a heater; transferring the CFPHS blank to a furnace; soaking the CFPHS blank in the furnace at a second predetermined temperature in a second predetermined temperature range for a predetermined period; and pressing and forming the CFPHS blank in a stamp/press to form a CFPHS component.

公开(公告)号：US20240227433A1

公开(公告)日：2024-07-11

申请号：US18358577

申请日：2023-07-25

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Henry ZHAN ,  Libing LIU ,  Jianfeng WANG ,  Yunhu ZHANG

IPC: B60B3/06 ,  B22D18/04 ,  B22D21/00 ,  B22D21/04 ,  C22B21/00 ,  C22C1/02 ,  C22C1/03 ,  C22C21/02

CPC classification number: B60B3/06 ,  B22D18/04 ,  B22D21/007 ,  B22D21/04 ,  C22B21/0092 ,  C22C1/026 ,  C22C1/03 ,  C22C21/02 ,  B60B2310/202 ,  B60B2360/104

Abstract: A method for casting an aluminum wheel comprises preparing a melt having a predetermined chemistry and including silicon in a range from 8.5 to 10% mass and aluminum; degassing and refining the melt; adding a grain refiner including aluminum-titanium-vanadium-boron (Al—Ti—V—B) and a master alloy to the melt; and casting the aluminum wheel.

公开(公告)号：US20230407446A1

公开(公告)日：2023-12-21

申请号：US17901289

申请日：2022-09-01

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Henry ZHAN ,  Pan WANG ,  Jianfeng WANG

IPC: C22F1/043 ,  C22F1/00 ,  C22C21/02

CPC classification number: C22F1/043 ,  C22F1/002 ,  C22C21/02

Abstract: Methods and heat-treated cast aluminum alloy components for a vehicle formed from an aluminum alloy having high levels of recycled aluminum scrap are provided. The alloy may have, by mass, silicon at ≥5% to ≤11%, magnesium at ≤0.5%, iron at ≥0.2% to ≤1.1%, copper at ≤0.5%, zinc at ≤0.5%, titanium at ≤0.2%, chromium at ≤0.02%, manganese at ≤0.05%, strontium at ≤200 ppm; an alloying element at ≥50 ppm to ≤500 ppm selected from the group consisting of: barium, lanthanum, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and combinations thereof, and a balance aluminum. The heat-treated cast aluminum alloy component is substantially free of faceted iron-containing intermetallics having a platelet shape and at least one region has a yield strength of ≥180 MPa and an elongation of ≥7%.

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.