METHOD FOR PRODUCING HARDENED COMPONENTS WITH REGIONS OF DIFFERENT HARDNESS AND/OR DUCTILITY

摘要

The invention relates to a method for producing a hardened steel component with regions of different ductility or hardness. A blank is stamped, and either the stamped blank is heated to a temperature = Ac3 in certain sub-regions and optionally maintained at said temperature for a specified period of time in order to carry out the austenite formation, the blank that is heated in certain sub-regions is subsequently transported into a molding tool, molded in the molding tool, cooled in the molding tool at a rate that lies above the critical hardening rate and thereby hardened, or the blank is molded in the completely cooled state, the molded blank is heated to a temperature > Ac3 in certain sub-regions and optionally maintained at said temperature for a specified period of time in order to carry out the austenite formation, and the blank that is heated in certain sub-regions and molded is subsequently transported into a hardening tool and hardened in the hardening tool at a rate that lies above the critical hardening rate. The steel material is adjusted in a displacive transformational manner such that a quench hardening takes place by means of the transformation of the austenite into martensite at a molding temperature ranging from 450 °C to 700 °C, wherein an active cooling takes place after the heating and prior to the molding, the blank or parts of the blank or the molded blank or regions thereof being cooled at a cooling rate > 15K/s.