REHEATING TEMPERATURE CONTRAST AND MICROSTRUCTURES OF 7075 A1 ALLOY CAST BY LIQUIDUS SEMI-CONTINUOUS CASTING

Abstract

Abstract: In this study, reheating of liquidus semi-continuous east billets of 7075 Al alloy wascarried out in a resistance furnace, and the temperature contrast of the outer andthe center of the reheated billets was investigated, then the reheating microstructureswere investigated. Results show that: the difference of temperature between the outerand center is small and the difference of their microstructures are also small. Dur-ing reheating at 576° C the spheroidization of grains is significant after 5rain and norosettes are visible after 20min by optical microscopy. Similar observations were madeon materials reheated at 596° C, but the ripening process is faster. The grains growup to 30-60pm, fine enough for thixoforming.

Key words: reheating, 7075 Al alloy, liquidus casting, microstructure

J. Dong, G.M. Lu, J.Z. Cui. REHEATING TEMPERATURE CONTRAST AND MICROSTRUCTURES OF 7075 A1 ALLOY CAST BY LIQUIDUS SEMI-CONTINUOUS CASTING[J]. Acta Metallurgica Sinica (English Letters), 2002, 15(6): 551-555 .

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REHEATING TEMPERATURE CONTRAST AND MICROSTRUCTURES OF 7075 A1 ALLOY CAST BY LIQUIDUS SEMI-CONTINUOUS CASTING

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