磁場與濃度對於錫鉛合金方向性凝固之金相組織之影響

Effect of Magnetic Field and Concentration on the Metallography of Directional Solidification of Sn-Pb Alloys

吳怡凡(Timothy Alfred Wu) ； 張簡振甫(Chen-Fu Chang Chjen) ； 趙隆山(Long-Sun Chao)

《鑄造工程學刊》 43卷3期 (2017/09) Pp. 27-40

摘要

本研究建立錫鉛合金之方向性凝固實驗模式，並且觀察到磁場與鉛濃度對於其凝固組織之影響。根據實驗結果方向性凝固鑄件從底部冷端至頂部熱端可分成激冷區、柱狀區、等軸區等三大區。添加鉛濃度愈低，微觀縮孔等缺陷較多，晶界較不清晰，難以觀察金相組織。共晶合金結構為層狀結構，結構細緻，樹枝狀不明顯難以觀察。在磁場的部份，一端施加N型，另一端施加S型，使其相吸，可使柱狀晶變粗。環狀磁場的施加方式會使柱狀晶變粗，而線性磁場的會使柱狀晶變細。

關鍵字

方向性凝固 ； 錫-鉛合金 ； 金相學 ； 磁場

並列摘要

In this paper, an experimental model for the directional solidification of Sn-Pb alloy is built and the effects of magnetic field and Pb concentration on the solidification morphology are investigated. According to the experimental results, from the microstructure observation, the casting can be divided into three zones, the chill zone, the columnar zone, and the equiaxed zone. In different Pb concentration, we observe that, lower Pb concentration has more point defect (microshrinkage etc.); G.B. didn't clear to be observed with OM. Eutectic Sn-Pb alloy is lamellar structure, dendrite didn't clear to be observed with OM. In the case of directional solidification with opposite attraction and cyclic magnetic fields, has coarser columnar structures than those of the one without magnetic field, but in the case of directional solidification with linear magnetic field, has thinner columnar structures than those of the one without magnetic field.

並列關鍵字

Directional solidification ； tin-lead (Sn-Pb) alloys ； metallography ； magnetic field