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

Abstract

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