公开(公告)号：US20250114837A1

公开(公告)日：2025-04-10

申请号：US18757440

申请日：2024-02-09

Applicant: ArcelorMittal

Inventor： Clément PHILIPPOT ,  Doriane SERRS ,  Hubert SALMON LEGAGNEUR ,  David DUSSAUSSOIS

IPC: B21D22/02 ,  C21D8/02 ,  C22C21/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/14 ,  C23C2/12

Abstract: A hot-stamped coated steel part includes a steel substrate and an aluminum alloy coating comprising, proceeding from steel substrate outwards, an interdiffusion layer and an outer layer. The total thickness of the coating ecoating and the thickness of the interdiffusion layer eIDL satisfy the following condition: 4 ⁢ 0 ≤ E p ⁢ c ≤ 80 with E p ⁢ c = ( 3 ⁢ 3 . 3 - e IDL 0 . 9 + e IDL - e c ⁢ o ⁢ a ⁢ t ⁢ i ⁢ n ⁢ g ) 2 - 1 ⁢ 4 ⁢ 8 ⁢ ( e IDL - e c ⁢ o ⁢ a ⁢ t ⁢ i ⁢ n ⁢ g ) - ( 3 ⁢ 3 . 3 - e IDL 0 . 9 + e IDL - e c ⁢ o ⁢ a ⁢ t ⁢ i ⁢ n ⁢ g ) The hot-stamped coated steel part comprises an undeformed portion having a thickness ePflat from 0.6 mm to 3.5 mm, and at least one deformed portion. A lineic density of cracks dC in the coating in the undeformed portion is higher than or equal to a minimum lineic density of cracks dCmin(ePflat) defined as: d ⁢ C min ( e p ⁢ flat ) = 1 ⁢ 5 . 5 + 9 ⁢ 1 * e - 7.44 - 2 . 8 ⁢ 8 * arctan ( 5.49 * ( e pflat - 1.7 1 ) ) - 1 ⁢ 0 6.5 * e - 8.62 - 3 . 3 ⁢ 4 * arctan ( 5.49 * ( e pflat - 1.71 ) )