|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Late News Posters
||PP-16: End Product Defects in Direct-Chill Casted Hot Rolling Slabs and Melt Treatment
||Arda Yorulmaz, Eray Erzi, Caglar Yuksel, Derya Dispinar
|On-Site Speaker (Planned)
Some defects in direct chill casting are only apparent after slabs are further processed via homogenising, hot rolling, cold rolling and final annealing. One of main defects in these products is surface blisters typically used in kitchen cookware, electrical appliance, thin foil etc. These products demand high aluminum melt cleanliness. A study in direct chill cast house using secondary ingot and scrap as material was carried out in order to find out about effects of gas purging methods, gas purging time, inclusion filtering type and fluxing on end product quality and blister rates, shapes and sizes. Bifilm index was found as a good quality assessment method for getting melt quality on demand after and during casting. It was found that porous plug gas diffusors were far more effective than stick or lance type gas purging and lead to fewer end product defects.