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：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.