PRODUCT AND PROCESS BY LOCALIZED HEAT TREATMENT OF SHEET STEEL
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United States of America Patent
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Sep 4, 2014
app pub date -
Jul 25, 2012
filing date -
Jul 25, 2011
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Abstract
A process for localized hardening of steel sheet components includes scanning a laser beam in a scan direction across a predetermined portion of the steel sheet component. The laser beam selectively heats material within the predetermined portion of the steel sheet component to a temperature of austenitizing transformation. During scanning of the laser beam across the predetermined portion, a source of external cooling is applied to the material within the predetermined portion and immediately behind the laser beam along the scan direction of the laser beam. The source of external cooling is selected to cool the material at a sufficiently rapid rate to form a locally hardened region that is defined substantially within the predetermined portion. Subsequent to applying the source of external cooling, the material within the predetermined portion of the steel sheet component is allowed to cool to ambient temperature.
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