대한금속재료학회지 (Korean Journal of Metals and Materials)

  • 제49권8호
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  • Pages.649-656
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  • 2011
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  • 1738-8228(pISSN)
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  • 2288-8241(eISSN)
대한금속재료학회 (The Korean Institute of Metals and Materials)
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강소성 가공된 Ni-30Cr 합금의 결정립 미세화와 기계적 물성 향상

Grain Refinement and Mechanical Properties Improvement in a Severely Plastic Deformed Ni-30Cr Alloy

  • 송국현 (한국생산기술연구원 융합신공정 연구그룹) ;
  • 김한솔 (한국생산기술연구원 융합신공정 연구그룹) ;
  • 김원용 (한국생산기술연구원 융합신공정 연구그룹)
  • Song, Kuk Hyun (Korea Institute of Industrial Technology, Advanced Fusion Process R&D Group) ;
  • Kim, Han Sol (Korea Institute of Industrial Technology, Advanced Fusion Process R&D Group) ;
  • Kim, Won Yong (Korea Institute of Industrial Technology, Advanced Fusion Process R&D Group)
  • 투고 : 2011.05.18
  • 발행 : 2011.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

The present study evaluated the microstructures and mechanical properties of severely deformed Ni-30Cr alloys. Cross-roll rolling (CRR) process was introduced as a severe plastic deformation (SPD), and Ni-30Cr alloy sheets were cold rolled to 90% thickness reduction and subsequently annealed at $700^{\circ}C$ for 30 min to obtain the recrystallized microstructure. Electron back-scattering diffraction (EBSD) was introduced to analyze grain boundary character distributions (GBCDs). The application of CRR to the Ni-30Cr alloy was effective in enhancing the grain refinement through heat treatment; consequently, the average grain size was significantly refined from $33{\mu}m$ in the initial material to $0.6{\mu}m$. This grain refinement directly improved the mechanical properties, in which yield and tensile strengths significantly increased relative to those of the initial material. We systematically discuss the grain refinement and accompanying improvement of the mechanical properties, in terms of the effective strain imposed by CRR relative to conventional rolling (CR).

키워드

과제정보

연구 과제 주관 기관 : 지식경제부

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