THEORETICAL ANALYSIS ON EFFECT OF TRANSFERENCE VELOCITY ON STRUCTURE OF POROUS METALS FABRICATED BY CONTINUOUS CASTING GASAR PROCESS
Received date: 2009-07-31
Revised date: 2009-10-19
Online published: 2010-02-10
Supported by
Supported by National Natural Science Foundation of China and Yunnan Provincial Government (No.u0837603), Natural Science Foundation of Beijing (No.2092017), Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (No.20091020471) and Key Talents Foundation of Tsinghua University
Transference velocity is an important processing parameter to influence the final lotus–type porous structure fabricaed by continuus 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 esearcher. 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 r1.72g ·v = A and L1.72 ·v = B, where A and B are all constants depending on the used gas presures and the melt temperature.
Key words： porous metal; metal–gas eutectic; continuucasting; transference velocity
LIU Yuan . THEORETICAL ANALYSIS ON EFFECT OF TRANSFERENCE VELOCITY ON STRUCTURE OF POROUS METALS FABRICATED BY CONTINUOUS CASTING GASAR PROCESS[J]. Acta Metall Sin, 2010 , 46(2) : 129 -134 . DOI: 10.3724/SP.J.1037.2009.00527
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