Arcelormittal Investigacion Y Desarrollo, S.l.

Audi Ag

Volkswagen Ag

Arcelormittal

Karl Michael Bader

Pascal Drillet

Raisa Grigorieva

Ludwig Schaller

Uwe Paar

Thomas Vietoris

Isabelle Thirion

Michael Alsmann

A manufacturing process of a hot stamped coated part comprising the following successive steps, in this order: providing a hot rolled or cold rolled steel sheet comprising a steel substrate and an aluminium-silicon alloy precoating, the precoating containing more than 50% of free aluminium and having a thickness comprised between 15 and 50 micrometers, then cutting the steel sheet to obtain a precoated steel blank, then heating the blank under non protective atmosphere up to a temperature Tcomprised between T&#x2212;10&#xb0; C. and T, Te being the eutectic or solidus temperature of the precoating, then heating the blank from the temperature Tup to a temperature Tcomprised between 840 and 950&#xb0; C. under non protective atmosphere with a heating rate V comprised between 30&#xb0; C./s and 90&#xb0; C./s, V being the heating rate between the temperature Tand the temperature T, in order to obtain a coated heated blank, then soaking the coated heated blank at said temperature Tfor a time tcomprised between 20 s and 90 s, then hot stamping the blank in order to obtain a hot stamped coated part, then cooling said stamped part at a cooling rate in order to form a microstructure in the steel substrate comprising at least one constituent chosen among martensite or bainite.

Fabrication process of coated stamped parts

Growing community of inventors

Ingolstadt, Germany

Karl Michael Bader