EFFECT OF COOLING WATER QUALITY ON DENDRITE ARM SPACING OF DC CAST BILLETS

摘要

For a given alloy chemistry & casting technology, the quality of abillet produced through DC ( Direct Chill) casting route is largelydefined by the DAS (Dendrite arm spacing). DAS in turn, isdetermined by the cooling rate and local solidification time. Thecooling rate is influenced by the quality & quantity of waterbesides casting speed and melt temperature. This paper focuses onthe relationship between the quality of cooling water & theresultant DAS during production of DC cast billets. An empiricalrelation is derived to indicate the influence of cooling watercharacteristics on the DAS, based on a mathematical modelsupplemented by experimental investigations. The model has beenvalidated in plant scale trials.