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Local Softening of Hot-stamped Parts using a Laser Heat Treatment

레이저 열처리를 이용한 핫스탬핑 부품의 국부 연화 기술 연구

Kim, K.B.;Jung, Y.I.;Kim, T.J.
김경보;정연일;김태정

  • Received : 2015.06.09
  • Accepted : 2015.08.18
  • Published : 2015.10.01

Abstract

AHSS (Advanced High Strength Steels) has been increasingly employed by global automotive OEMs in order to satisfy strengthened regulations and reduce weight for fuel efficiency. Hot stamping using boron steels in AHSS increases not only formability but also strength. The typical hot-stamped automotive part is the center pillar that is critical for vehicle side impact. However, the hot-stamped part can be risky for the passenger safety caused by brittle fracture under a vehicle collision. The high power diode laser is suitable for the heat treatment giving AHSS increased elongation that prevents brittle fracture in car crash. Therefore, local softening by laser heat treatment for energy absorption area on the hot-stamped part improves crash-worthiness.

Keywords

Hot Stamping;Laser Heat Treatment;Local Softening;Center Pillar;Vehicle Side Impact