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Low-Cycle Fatigue in Quenched Boron Steel Sheet Due to Hot Stamping

열간 성형된 보론강판의 저주기 피로 특성

  • Jang, Won-Seok (Daegu Machinery Institute of Components & Materials) ;
  • Suh, Chang-Hee (Daegu Machinery Institute of Components & Materials) ;
  • Oh, Sang-Kyun (Daegu Machinery Institute of Components & Materials) ;
  • Kim, Dong-Bae (Daegu Machinery Institute of Components & Materials) ;
  • Sung, Jee-Hyun (Daegu Machinery Institute of Components & Materials) ;
  • Jung, Yun-Chul (Daegu Machinery Institute of Components & Materials) ;
  • Kim, Young-Suk (School of Mechanical Engineering, Kyungpook Natl. Univ.)
  • Received : 2010.05.26
  • Accepted : 2010.07.08
  • Published : 2010.10.01

Abstract

Boron steel sheet is suitable for fabricating automobile parts because it is very strong and has low weight. Recently, many car makers are investigating the feasibility of fabricating the chassis part of automobiles using boron steel. In order to use boron steel sheets to fabricate the chassis part of automobiles, much better material property of low cycle fatigue life as well as high formability during hot stamping is required. Therefore, the low-cycle fatigue life of hot-stamped quenched boron steel was investigated in this study. The fatigue life observed at low strain amplitude was longer than that of an as-received boron steel sheet. However, the fatigue life reduced at high strain amplitude because of the low ductility and low fracture toughness of martensite, which was produced as a result of hot stamping.

Keywords

Boron Steel Sheet;Hot Stamping;Low Cycle Fatigue

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  2. Study on Fatigue Characteristic of Suspension Part Using Hot Forming vol.37, pp.3, 2013, https://doi.org/10.3795/KSME-A.2013.37.3.339