THEORETICAL ANALYSIS ON EFFECT OF TRANSFERENCE VELOCITY ON STRUCTURE OF POROUS METALS FABRICATED BY CONTINUOUS CASTING GASAR PROCESS

Transference velocity is an important processing parameter to influence the final lotus- type porous structure fabricated by continuous casting Gasar process. Via solving the solute diffusion equation, a theoretical model was developed to predict the effect of the transference velocity on the porosity, the pore diameter and the inter-pore spacing. The predicted values at different transference velocities have a good agreement with the corresponding experimental results obtained by Japanese researcher. The average pore diameter and the inter-pore spacing L both have a prominent decrease with the increase of transference velocity v, but the porosity only has a slight decrease. The theoretical relationships between the pore radius rg, the inter-pore spacing and the transference velocity can be described by the two simple equations as r 1.72 g ·v = A and L 1.72 ·v = B, where A and B are all constants