Invention Application
- Patent Title: MULTILAYER STEEL AND METHOD OF REDUCING LIQUID METAL EMBRITTLEMENT
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Application No.: US15668751Application Date: 2017-08-04
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Publication No.: US20190040487A1Publication Date: 2019-02-07
- Inventor: Charles Enloe , Curt D. Horvath , David Yang , Qi Lu , Wu Tao
- Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Applicant Address: US MI Detroit
- Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Current Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
- Current Assignee Address: US MI Detroit
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C21D8/02 ; C21D3/04 ; C23C2/06 ; B32B15/01 ; B23K11/11 ; B23K11/16 ; B23K26/22 ; B23K26/322

Abstract:
A multilayer steel includes a core formed of transformation-induced plasticity (TRIP) steel. A decarburized layer is exterior to the core on at least one side thereof. The decarburized layer has reduced carbon content relative to the core. A zinc-based layer is exterior to the decarburized layer. The decarburized layer may have a composition of at least 80 percent ferrite, such that LME is reduced or mitigated. In some configurations, the decarburized layer is between 10-50 microns thick. A method of creating a coated advanced high-strength steel component is also provided. An apparatus for forming a coated advanced high-strength steel is also provided. The core of the multilayer steel may have a carbon weight-percent of less than or equal to 0.4. The decarburized layer of the multilayer steel may have a carbon weight-percent of less than or equal to 50 percent of the carbon weight-percent of the core.
Public/Granted literature
- US10329639B2 Multilayer steel and method of reducing liquid metal embrittlement Public/Granted day:2019-06-25
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