LAUSR

Hot stamping of boron steel has been becoming more and more popular in the last decades due to the increasing demands for the vehicle lightweight and crashworthiness improvement. Hot stamped components are manufactured by heating sheets to austenitization in a gas furnace, and then simultaneously forming and quenching in a die set, which has an advantage on the improvement of formability and decrease of springback.1) In recent years, more stringent requirements for the vehicle crashworthiness bring new challenges that the hot stamped components should possess different mechanical properties in different regions. A partial region of the components should have an increased tensile strength to preserve the structural integrity under high dynamic load, whereas the other region should own an increased elongation to improve the capacity of energy absorption.2) For the purpose of tailoring the microstructure and mechanical properties of hot stamped components, some derivative forming processes developed from the conventional hot stamping have emerged. Tailored welded blanks (TWBs) and tailored rolled blank (TRBs) were employed to manufacture the components with gradually changed properties in hot stamping.3–7) These two methods increase the costs of the tailored blank production and put forward higher Heating Parameters Optimization of Hot Stamping by Partition Heating for Tailored Properties