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Journal of the Korea Institute of Military Science and Technology 2003;6(4):159-166.
Cogging of premium-quality Alloy 718
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고청정 Alloy718 잉고트 Cogging
박노광, 염종택, 임정숙, 최상욱
한국기계연구원 재료기술연구소 공정연구부
Abstract
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.
Key Words: VIM/VAR/VAR(Vacuum induction melting/vacuum arc remelting/vacuum arc remelting), Alloy718, Ingot structure, Cogging, Processing map
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