The influence of the initial microestructure and die material de thixoforming of A356 alloy / Influencia da microestrutura inicial e material de molde na tixoconformação da liga A356

AUTOR(ES)

Beethoven Max Alves da Silva

DATA DE PUBLICAÇÃO

2007

RESUMO

This research aims the influence of initial microstructure and die material on thixofonning of A356 alloy. Obtained slurries are produced and tested in thixoforging operation by three distinct processes: controlled partial melting of coarse dendritic structures, controlled partial melting of ultra-refined structures and obtained slurries by liquid mechanical stirring during solidification. It is still produced a composite A356 + AbO:i obtained by compocasting. Thixoforged samples were submitted to metalographic analysis for microstructural characterisation, measuring the primary phase fraction and globule average size or 50lid phase rosette. Obtained results showed the viability of non-metallic dies in thixoforming operations with good superficial and dimensional finishing produds. Thixoforging forces are dependent on initial condition of raw material, 50 that higher forces are required with the increasing of basic microstructural parameter Onterdentritic spacing, globule size and rosette size) of raw material

ASSUNTO(S)

forjamento metallurgy conformação de aluminio aluminum aluminum ligas de aluminio forming of aluminum microestrutura aluminio aluminio - metalurgia microstructure forging aluminum alloys

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