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題名 | 半固態A356鋁合金鑄造性研究=The Studies on the Castability of the A356 Aluminum Alloy in Semi-Solid State |
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作者 | 楊耀昇; 曹紀元; 毛世傑; 蔡兆豐; 翁震杰; 黃立奇; | 書刊名 | 鑄工 |
卷期 | 23:4=95 1997.12[民86.12] |
頁次 | 頁84-95 |
分類號 | 472.5 |
關鍵詞 | 半固態鑄造; A356鋁矽合金; |
語文 | 中文(Chinese) |
中文摘要 | 半固態鑄造(SSC) 成型為一金屬淨形體成型製程,其具有傳統鑄造製程之特性,且其得 之產品由文獻記載較傳統鑄造有優良之機械性質。半固態鑄造成型即為將已攪拌製造所得之非樹 枝狀晶組織之鑄錠,再加溫至兩相區形成半固態後,再於擠壓鑄造成型之金屬成型製程。本研究 將具有半固態非樹枝狀晶(SSND) 組織之A356鋁矽合金,在其兩相區溫度585℃時以製得之薄片 和傳統之全液態鑄造之薄板片及在半固態為樹枝狀組織鑄造之薄板片作一比較探討,已獲得以下 幾點成果: 以半固態樹枝狀晶(SSD) 為鑄造原料和以半固態非樹枝狀晶為鑄造原料,雖均可鑄造出原本 設計所要成型之鑄件,但由於半固態樹枝狀晶流動性差,以至於其形同全液態鑄造。而半固態非 樹枝狀晶為鑄造原料卻可鑄造出其固相晶粒分佈較均勻之鑄件。以半固態非樹枝狀晶所鑄造出來 之鑄件,經由非破壞X光檢驗為A級。機械性質在硬度方面,因固液兩相的存在,使其硬度值均 比以全液態或半固態樹枝狀晶鑄件要來的低。在現在製程中雖可鑄造出半固態鑄件,但在其鑄件 邊緣附近,因擠壓速度之不足而有其固液相偏析現象,應以更快之衝擊速度來解決此問題。 |
英文摘要 | SSC (Semi-Solid Casting) is a process for net-shape forming. It possesses some characteristics of the conventional casting process, and as the literature points out the SSC products have better mechanical properties than those of the conventional casting. In the SSC process, a stirring-cast billet with a non-dendritic structure is reheated to the two phase-region, then the billet is squeeze-cast in the semi- solid state. In this study, A356 A1-Si alloy with a non-dendritic structure was held at 585℃ in the two- phase region and squeezed into the mold, from which the thin plates with thickness of 3mm、4mm、5mm and 6mm were made. We compare these thin plates made from SSC with SSD (Semi-Solid Dendritic Structure) and SSND (Semi-Solid Nondendritic Structure) with the conventional castings and have the following conclusions : Since the flowability of the SSD is poor, the final properties of the SSD are similar to those produced from the conventional casting process. For SSND solid crystal distribution obtained is fairly uniform with SSC. The properties of the castings from the SSND were observed to be better than the SSD based upon the non-destructive X-ray test results. The hardness values for SSND materials are lower htan those of the castings produced both from full liquid state and from the SSD. But the solid-liquid segregation phenomena appear around the edges of the castings because of the lack of squeezing speed. This problem can be resolved by increasing the squeezing speed. Both the SSD were used as the raw materials for this study. |
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