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題名 | 過共晶鋁矽合金之初晶矽細化效果研究=Modification of Primary Silicon in Hypereutectic Al-Si Alloys |
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作者姓名(中文) | 陳亮宇; 徐宇傑; 楊智富; | 書刊名 | 鑄造工程學刊 |
卷期 | 38:4=155 2012.12[民101.12] |
頁次 | 頁13-18 |
分類號 | 472.5 |
關鍵詞 | 鋁矽合金; 初晶矽細化; 細化效果衰退; Al-Si alloys; Primary silicon refinement; Fading; |
語文 | 中文(Chinese) |
中文摘要 | 本研究為釐清過共晶鋁矽合金之初晶矽細化效果衰退之機制,採用較單純之二元Al-P細化劑,分析其對二元Al-17%Si合金及商用A390合金之細化效果,探討在熔湯處理及鑄造過程中影響細化效果之參數,並分析這些參數之細化效應。本研究主要之實驗參數包括:細化劑之添加量、攪拌動作、熔湯持溫時間等。實驗結果顯示,對添加80~400 ppm P之Al-17%Si合金而言,當P含量為80~150ppm時,其在765℃持溫8小時內均可維持良好的細化效果;但當P含量≧200 ppm時,Al-17%Si合金熔湯持溫4小時即會出現細化衰退現象,造成鑄件之初晶矽粗化。當進一步分析比較100 ppm及120 ppm 之P含量對商用A390合金之細化效果時發現,P含量較高者(120 ppm)在熔湯持溫3小時內具較佳之細化效果,但至第4小時起,即會出現衰退現象,若將P含量降低至100 ppm,其細化效果雖略降低,但可延緩細化衰退現象。而解決含P過共晶鋁矽合金初晶矽細化衰退問題最直接有效之方法,乃是避免添加過量之P,如此即可避免細化效果之衰退。 |
英文摘要 | In this study the fading of primary Si refinement in hyper-eutectic Al-17% Si and commercial A390 alloys were studied by using a binary Al-3.1P alloy modifier. A variety of melt treatments which have profound influences on the refinement of primary silicon in the Al-Si alloys were examined. These include the amount of P added, mechanical stirring to speed up the P treatment and melt holding treatment. The results of P fading tests performed in Al-17% Si alloy melts containing 80-400 ppm P showed that, when holding at 765oC for up to 8 hours, there is no fading observed in the Al-Si alloy melts which contains 80-150 ppm P. But when the P content increased to 200 ppm or above, fading occurs after 4 hours of melt holding treatment. Further analysis and comparison on the fading effect of P were performed in A390 alloy containing 100 and 120 ppm P. It was found that the A390 alloy with higher P content (120ppm) exhibits a better modification effect in the first 3 hours of melt holding treatment. However, fading of primary Si refinement was then observed at the 4th hour of melt holding treatment. By reducing the P content to 100 ppm it was found that, although the refining effect is slightly decreased, the occurrence of P fading in the A390 alloy was found to be slower to that in the A390 alloy containing 120 ppm P. It was concluded that a most effective way to resolve the P fading problem is to avoid an excess amount of P addition in the Al-Si alloys. |
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