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자료유형
학술저널
저자정보
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.20 No.6
발행연도
2014.1
수록면
1,103 - 1,114 (12page)

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초록· 키워드

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An oscillating multi-mold simulator with embedded thermocouples was used to study the initial solidificationof medium carbon steels and crystallization characteristics of the mold flux. Casting speed variationsin the simulator from 0.7 m/min to 1.4 m/min at fixed oscillation frequency and stroke resulted in highercopper mold temperatures. Frequency modifications from 2.5 Hz to 5.0 Hz and stroke changes from 8.1 mm to5.4 mm at fixed casting speeds also resulted in higher copper mold temperatures. Surface profile analysisof as-cast steel strips showed characteristic oscillation marks comparable to the narrow faces of the industrialcast slabs. The apparent effect of casting variables on the temperature and surface profiles during thesolidification of the medium carbon steels could be correlated to the variations in the negative strip timeand subsequent changes in the extent of mold flux infiltration. Back scattered scanning electron microscopeanalysis of the full length of the retrieved flux film after casting showed cuspidine crystallization ratio thatincreased from the upper to lower portion of the flux film. This dynamic crystallization and growth of thecuspidine phase increases as the flux is sustained at high temperatures for longer periods. Additional experimentswith industrial fluxes designed for soft cooling of medium carbon steel grades showed comparableinfiltration thickness of the flux, but the crystallization characteristics were significantly different, whichcould have a significant impact on the heat transfer rate and mechanism through the flux film.

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