Method for laser heat treatment to improve formability of advanced high strength steels
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United States of America Patent
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Jun 6, 2017
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Dec 31, 2013
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Sep 17, 2013
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Abstract
A method for laser heat treatment of high tensile steel is provided to improve for improving formability. The method includes performing a heat treatment by irradiating a surface of a high tensile steel blank that includes a martensite structure and a ferrite structure with a laser to decrease a fraction of the martensite structure and increase a fraction of the ferrite structure. In addition, the method includes slowly cooling the blank to temper or anneal the heat-treated blank and subjecting the cooled blank to cold press forming.
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