Method for producing hardened components with regions of different hardness and/or ductility
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United States of America Patent
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May 5, 2020
Grant Date -
Jan 30, 2014
app pub date -
Dec 22, 2011
filing date -
Dec 24, 2010
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Abstract
The invention relates to a method for producing a hardened, steel component with regions of different hardness and/or ductility; a blank is stamped out and either heated in some regions to a temperature ≥Ac3, and then transferred to a forming die, is formed, and is cooled at a speed that is greater than the critical hardening speed and thus hardened or is cold formed into the finished shape and the formed blank is heated in some regions to a temperature >Ac3 and then transferred to a hardening die and is hardened at a speed greater than the critical hardening speed; the steel material is adjusted in a transformation-delaying fashion so that a quench hardening through transformation of austenite into martensite takes place at a forming temperature that lies in the range from 450° C. to 700° C.; after the heating and before the forming, an active cooling takes place at >15 K/s.
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