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 楊棟賢01

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The Effect of directionally Chilled microstructure on Hypereutectichigh-chromium white cast iron

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Dong-Shyen Yang

Keywords： carbon equivalent,directional solidification,temperature gradient

Abstract：This study examined the effect of fliid convection on microstructures of directionally solidified high-chromium white cast iron(ASTM A532-87 ClassIII)with carbon equivalents of 4.5.The iron was first melted in a high-frequency induction furnace,and then poured into a sandwiched cylindrical Furan resin snd mold. The middle parties a chilled copper mold kept cold by circulating water,enabling simultaneous directional solidification in the upper and lower zones.The microstructure thus solidified is affected by directionally chilled between these parts.

Distribution of temperature in the mold during cast solidification was measured by K-type thermocouples.The measured results show that the lower zone has stronger thermal convection and faster cooling rate than the upper zone.The lower zone has smaller liquidus and solidus gradients than the upper zone.

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