한국군사과학기술학회지 (Journal of the Korea Institute of Military Science and Technology)

  • 제6권4호
  • /
  • Pages.159-166
  • /
  • 2003
  • /
  • 1598-9127(pISSN)
  • /
  • 2636-0640(eISSN)
한국군사과학기술학회 (The Korea Institute of Military Science and Technology)
권호 표지

고청정 Alloy718 잉고트 Cogging

Cogging of premium-quality Alloy 718

  • 박노광 (한국기계연구원 재료기술연구소 공정연구부) ;
  • 염종택 (한국기계연구원 재료기술연구소 공정연구부) ;
  • 임정숙 (한국기계연구원 재료기술연구소 공정연구부) ;
  • 최상욱 (한국기계연구원 재료기술연구소 공정연구부)
  • 발행 : 2003.12.01
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초록

Microstructures and mechanical properties of VIM/VAR/VAR-processed Ni-based Alloy718 ingot were investigated. Vacuum arc remelting(VAR) results in chill grain zone, columnar grain zone, and equi-axed grain zone in the ingot due to the difference in local solidification processes. Different grain structures of the remelting ingot result in the different hot workability for the given cogging conditions. Experimental results on microstructural inhomogeniety and material flow behavior under billet cogging conditions were presented, and their potential effects on the billet cogging process are discussed.

키워드

참고문헌

  1. R.J, Siddall, Superalloys 718, 625 and Various Derivatives, ed. E.A. Loria, The Minerals, Metals & Mate. Sac. 29(1991)
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  3. Y.V.R.K. Prasad and S. Sasidhara, 'Hot Working Guide; A Compendium of Processing Maps', ASM, USA(1997)
  4. H. Ziegler, Thennomechanics, 2nd Ed., North Holland, Amsterdam, 1983
  5. G. Sarma, B. Radhakrishnan and T. Zacharia, Proceed. on Microstructure Modeling and Prediction during Thennomechanical Processing, TMS, 37(2001)