소성∙가공 (Transactions of Materials Processing)

  • 제22권5호
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  • Pages.269-274
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  • 2013
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  • 1225-696X(pISSN)
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  • 2287-6359(eISSN)
한국소성∙가공학회 (The Korean Society for Technology of Plasticity and materials processing)
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1.5wt%C 초고탄소 워크롤 제조를 위한 단조 공정 설계: 기공압착 및 접합강도 분석

Process Design for Manufacturing 1.5wt%C Ultrahigh Carbon Workroll: Void Closure Behavior and Bonding Strength

  • 투고 : 2013.06.19
  • 심사 : 2013.07.18
  • 발행 : 2013.08.01
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초록

Experiments and numerical simulations of the incremental upsetting test were carried out to investigate void closure behavior and mechanical characteristic of a 1.5wt%C ultra-high carbon steel. The experimental results showed that the voids become quickly smaller as the reduction ratio increases. The simulation results confirmed this behavior and indicated that the voids were completely closed at a reduction ratio of about 40~45% during incremental upsetting. After the completion of the incremental upsetting tests, the process of diffusion bonding was employed to heal the closed voids in the deformed specimens. To check the appropriate temperature for diffusion bonding, deformed specimens were kept at 800, 900, 1000 and $1100^{\circ}C$ for an hour. In order to investigate the effect of holding time for diffusion bonding at $1100^{\circ}C$, specimens were kept at 10, 20, 30, 40, 50 and 60minutes in the furnace. A distinction between closed and healed voids was clearly established using microstructural observations. In addition, subsequent tensile tests demonstrated that complete healing of a closed void was achieved for diffusion bonding temperatures in the range $900{\sim}1100^{\circ}C$ with a holding time larger than 1 hour.

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과제정보

연구 과제 주관 기관 : 재료연구소

참고문헌

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피인용 문헌

  1. Forging of 1.9wt%C Ultrahigh Carbon Workroll : Part II - Void Closure and Diffusion Bonding vol.22, pp.8, 2013, https://doi.org/10.5228/KSTP.2013.22.8.463