DIRECTIONAL SOLIDIFICATION OF COMMERCIAL BRASS

ALICIA ESTHER ARES; RUBENS CARAM; CARLOS ENRIQUE SCHVEZOV

Charlotte, North Carolina ?USA

Congreso; EPD CONGRESS 2004; 2004

The Minerals, Metals & Materials Society

The columnar-to-equiaxed transition (CET) was observed in brass samples directionally solidified from the chill zone in different solidification conditions. The transition occurs when the gradient in the liquid ahead of the columnar dendrites reaches values between - 2.23 °C/cm and 1.05 °C/cm and the growth velocities reach values between 0.13 cm/s and 0.34 cm/s. The microstructure obtained is analyzed taking into account the characteristics of the alloy and the temperature profiles at the solidification interface. The variation of the primary and secondary dendritic spacings along the length of the sample is analyzed and the values experimentally measured are compared with results predicted by different theoretical models.