발간논문

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Vol.35, No.1, 57 ~ 64, 1997
Title
Research Paper - Mechanical Behavior : Effects of Electroslag Remelting on the Hot Workability of Ni - Cr - Fe Alloy
김태규Tae Kyu Kim, 장진성Jin Sung Jang, 최해욱Hae Wook Kwon, 김성수Sung Soo Kim
Abstract
Corrosion resistant Ni-Cr-Fe alloy(UNS NO6690) was prepared by vacuum induction rnelting(V.I.M). Hot workability was investigated at various temperatures and discontinuity was observed at around 1100℃. Vacuum induction melted Ni-Cr-Fe ingots were remelted by electroslag remelting(E.S.R) method. The surface of E.S.R ingots showed clean surface finish and was much influenced by flux composition. E.S.R ingots showed directionally grown grains. As melting rate decreased, the grains were elongated more. The amount and the size of nonmetallic inclusions were reduced after E.S.R. Hot workabilities of E.S.R treated ingots were much improved at various temperatures compared with those of V.I.M ingots(especially from 30 to 95% of reduction of area at 1100℃). The improvement of hot workability is attributed to the change of inclusion amount and morphology as well as cast grain size and directionality.
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