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US 12,606,878 B2Granted
Al—Si coated press hardening component, a preparation method and use thereof
AssigneeThe University of Hong Kong
InventorsMingxin Huang, Ming Guan
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AssigneeThe University of Hong Kong
InventorsMingxin Huang, Ming Guan
Estimating the term…
An Al—Si coated press hardening component, wherein the Al—Si coating comprises a low-Al content ferrite layer with an Al content of less than 5 wt % and a thickness of greater than 5 μm, and having a maximum bending angle of the Al—Si coated press hardening component is greater than 65°. The thickness of the tough low-Al content ferrite layer in the Al—Si coating after hot stamping, reaching 5-100 μm, by improving the hot stamping process, so that the formation or propagation of cracks on the surface or the coating is effectively prevented, and the bendability of the pre-coated steel after hot stamping is improved. At the same time, the hot stamping process of the present invention can take into account or optimize the microstructure of the steel substrate to further improve the bendability and tensile property of the whole material.
An Al—Si coated press hardened component, which comprises a steel substrate and an Al—Si coating arranged on at least one surface of the steel substrate, the Al—Si coating comprising a low-Al content ferrite layer with an Al content of less than 5 wt % formed by interdiffusion between the steel substrate and an Al—Si pre-coating, wherein the thickness of the low-Al content ferrite layer is at least 8 μm, the maximum bending angle of the Al—Si coated press hardened component is greater than 66°, as measured by VDA 238-100 standard bending test, and wherein a prior austenite grain size in the microstructure of the steel substrate is not more than 18 μm.
Dependencies are inferred from the claim text.