Our understanding of macrosegregation: Past and present

Macrosegregation has long been a topic of engineering importance, with reco rded publications on the subject extending back nearly half a millennium. T he phenomenon has assumed new importance in recent decades with the advent of new casting processes including continuous casting. This lecture reviews our current understanding of macrosegregation, with particular reference o f carbon steel ingots and continuous castings. Aspects of the problem are n oted where our understanding remains weak.