INFLUENCE OF ROLL SURFACE AND MELT TREATMENT ON THE QUALITY OF SINGLE ROLL STRIP CASTING PRODUCTION

Ano: 2019

Instituições de ensino: Universidade Estadual Paulista "Júlio de Mesquita Filho", Universidade Estadual Paulista - Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista "Júlio de Mesquita Filho", Universidade Estadual Paulista "Júlio de Mesquita Filho", Advanced Engenharia

Idioma: Ingles

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Resumo

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.

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