Journal of the Korean Society of Industry Convergence (한국산업융합학회 논문집)

The Korean Society of Industry Convergence (한국산업융합학회)
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Failure Analysis on SCM435 High Strength Bolt of Forging Die

단조 금형 SCM435 고장력 볼트의 파손 해석

  • Yun, Seo-Hyun (Interdisciplinary Program of Marine Convergence Design, Pukyong National University) ;
  • Kim, Min-Heon (Interdisciplinary Program of Marine Convergence Design, Pukyong National University) ;
  • Nam, Ki-Woo (Dept. of Materials Science and Engineering, Pukyong National University)
  • 윤서현 (부경대학교 마린융합디자인협동) ;
  • 김민헌 (부경대학교 마린융합디자인협동) ;
  • 남기우 (부경대학교 재료공학과)
  • Received : 2019.10.21
  • Accepted : 2019.12.05
  • Published : 2019.12.31
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Abstract

Fracture behaviors of SCM435 high strength bolt have been studied including macroscopic and microscopic fracture observation, Energy Dispersive X-ray Spectroscopy, Vickers hardness test and applied stress evaluation. cracks (ratchet marks) were generated by the repetitive loads acting on the bolts, initial stress of bolt and the stress concentration. The applied stress was found to be slightly higher than the fatigue limit of the material. The initial stress of bolt must be removed, and the mold temperature during the process must be maintained by room temperature. Bolts are recommended to be peened to improve fatigue limit.

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References

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