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公开(公告)号：US12270086B2
公开(公告)日：2025-04-08
申请号：US17271161
申请日：2019-08-30
Applicant: ArcelorMittal
Inventor： Sadok Gaied
Abstract: A method to improve the formability of steel blanks, for steels containing at least 5% martensite, and possibly some ferrite, bainite and residual austenite and having an ultimate tensile strength of at least 500 MPa and possibly having a metallic coating layer on at least one side, wherein the steel blank is heat-treated on at least part of its peripheral thickness using at least one heat source, which heats the steel in a heat-treated zone to a temperature between 400° C. and 1500° C. without melting the steel in any points of the heat-treated zone.
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公开(公告)号：US11911847B2
公开(公告)日：2024-02-27
申请号：US16976392
申请日：2019-02-26
Applicant: ArcelorMittal
Inventor： Francis Schmit , Maria Poirier , Sadok Gaied
IPC: B23K26/322 , B23K26/323 , B23K26/12 , B23K26/32 , C21D9/50 , C21D9/46 , C21D1/673 , C21D1/18 , B23K35/30 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/50 , C22C38/54 , C22C38/58 , B62B3/02 , B62B3/10 , B62B3/12 , B23K101/18 , B23K103/04 , B23K101/00 , B23K26/24 , C22C38/48
CPC classification number: B23K26/322 , B23K26/123 , B23K26/32 , B23K26/323 , B23K35/3073 , B62B3/02 , B62B3/106 , B62B3/12 , C21D1/185 , C21D1/673 , C21D9/46 , C21D9/50 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/50 , C22C38/54 , C22C38/58 , B23K26/24 , B23K2101/006 , B23K2101/185 , B23K2103/04 , B62B2202/22 , B62B2205/30 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C38/48
Abstract: A method for producing a part includes providing a first and a second precoated sheet (1,2), butt welding the first and second precoated sheets (1) to obtain a blank (15), and heating the blank (15) to a heat treatment temperature at least 10° C. lower than the full austenitization temperature of the weld joint (22) and at least 15° C. higher than a minimum temperature Tmin:
T
min
(
°
C
.
)
=
AC
3
(
WJ
)
-
α
IC
max
100
(
Ac
3
(
WJ
)
-
673
-
40
×
Al
)
.
where
Ac3(WJ) is the full austenitization temperature of the weld joint (22)
α
IC
max
=
(
1
-
(
1
+
ρ
)
(
max
(
1
;
ρ
)
Ts
2
-
350
)
(
1
-
β
)
(
ρ
Ts
2
+
Ts
1
)
+
β
(
1
+
ρ
)
(
3130
C
FW
+
750
)
-
350
×
(
1
+
ρ
)
)
×
100
,
where
TS1 and TS2 are the ultimate tensile strengths of the strongest and the weakest substrate after press-hardening
CFW is the carbon content of the filler material
β is the proportion of filler material
ρ is the ratio between the thicknesses of the weakest and the strongest substrate
The method also includes holding the blank (15) at the heat treatment temperature for a time between 2 and 10 minutes; and press-forming the blank (15) into a part and cooling.
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