2. Experimental set-up
The hot stamping process uses boron steel blanks which are heated to about 900 0
C. The blank is then formed
and quenched in cooling tools to obtained martensitic ultra high strength steel. And most of the studies are about
theoretic exploration, lacking the overall awareness of the hot stamping process in practice and performance of the
actual formed door impact beams. The door impact beam investigated is located inside the front door in a car. The
design is a hot stamping part with length of 1,105 mm, width of 140 mm and max depth of 45mm. Its cross-section
is complex featured with twin-U shape. The new design of front door impact beam for hot stamping is shown in
Fig .2. The investigated material is 15B22 boron steel which is developed by local steel company. The zinc-coated
and uncoated steel plates were both provided in thickness of 1.4mm.