溶融Al合金の高速流動条件下におけるSKD 61の溶損挙動について

概要

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Dissolution behavior of SKD 61 in molten high Si-Al alloy (B 390 alloy) at 700-800°C was investigated. The 10mmφ test piece was revolved on the 30mmφ orbit at 0-500rpm, that corresponds to 120-7000 of Re number.Results obtained are as follows;1) The compound layer covering the dissolved specimen was FeSiAl3.2) Surface profiles of dissolved specimen were classified into three types. Type I, which appears to be homogeneous dissolution, was observed at low temperature and Re number. The dissolution rate was controlled by the diffusion of Fe in molten Al alloy.3) In case of type II, the dissolution occured mainly at front side of specimen and the dissolution is accelerated by flaking of compound layer, which was caused by negative pressure around the test piece.4) Type III is characterized by uncertain local dissolution and high dissolution rate than type II. Accelerating mechanism of type III cannot be explained by flaking of compound layer or local high velocity by turblent flow.
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