Al合金溶湯における鋼の溶損におよぼす炭化物の量と種類の影響

概要

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High vacuum die-casting process and low speed die-casting process are used in these days. These die-casting processes need high projection speed or high temperature molten Al alloy. So dissolution of steels in molten Al alloy becomes important. The purpose of this study is to reveal the effect of carbide volume fraction and carbide type on dissolution of steels in molten Al alloy. In the dissolution test, specimen immerse in molten Al alloy. The results are as follows. 1) Dissolution weight was nearly equal to cabide fraction and carbide type with no rotation in the dissolution test. 2) Dissolution weight was decresed with increase of carbide fraction. Dissolution weight was not related to carbide type. 3) There are two reasons for effect of carbide on dissolution weight. One is that increase of carbide volume fraction affects decrease of iron diffusion flux in molten Al alloy. Another is that increase of carbide volume fraction increase of molten Al alloy viscosity coefficient. 4) It is necessary to consider the laminor flow and turbulent flow for the diffusion control of Fe in molten Al alloy.