Eventos Anais de eventos
COBEF 2019
COBEF 2019
INFLUENCE OF ROLL SURFACE AND MELT TREATMENT ON THE QUALITY OF SINGLE ROLL STRIP CASTING PRODUCTION
Submission Author:
Lucas Veronez Goulart Ferreira , SP
Co-Authors:
Lucas Veronez Goulart Ferreira, Pedro Barbosa de Oliveira Neto, Antonio de Padua Lima Filho, Douglas Bueno, Miguel Borodiak
Presenter: Lucas Veronez Goulart Ferreira
doi://10.26678/ABCM.COBEF2019.COF2019-0028
Abstract
Strips made of aluminum alloy A413 were fabricated using the single roll continuous casting processing, with pouring temperature of the cast alloy (≈1300g) of about 680 ºC on the cooling slope, producing a metallic slurry that feeds the nozzle which is dragged by the roll at a rate of 0.2 m/s. Two conditions for the finishing of the roll surface were tested: 1.) Coating of the surface with boron nitride (BN); and 2.) Finishing of the surface using 1200 grit sandpaper. Further tests with the roll’s surface finish obtained with a 1200 grit sandpaper were carried out: 1.) without alloy additions; and 2.) with TiBAl as grain refiner. The microstructures were observed using an Optical Microscope - OM and a Scanning Electron Microscope - SEM. The mechanical properties were obtained through tensile testing. It was found a decrease on the strength of the strips by coating the roll with boron nitride. A relevant increase in yield and tensile strength was measured on the specimen treated with TIBAL, along with a decrease on the elongation at fracture. Effects of poisoning were not found, although reported in Al-Si alloys with more than 3wt% of Silicon. More eutectic phase was formed by the addition of TIBAL. It suggests an action of the Ti and B on the coupled zone of the Al-Si eutectic.
Keywords
Strip Casting, TiBAl, Al-Si A413, Al-Si Coupled Zone
