(1. 甘肅工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院, 蘭州 730050；
2. 華中科技大學(xué) 材料科學(xué)與工程學(xué)院, 武漢 430074)
摘 要: 就熱型連鑄工藝條件下對(duì)具有共晶、包晶和共析轉(zhuǎn)變的5種典型鋅鋁合金的連續(xù)定向凝固進(jìn)行了研究，找出了各種合金的最佳工藝參數(shù)配合范圍。研究表明：引錠操作是熱型連鑄工藝的關(guān)鍵環(huán)節(jié)，型口溫度、拉鑄速度、冷卻條件、合金成分和液位壓頭對(duì)鑄錠表面質(zhì)量有直接影響，型口位置的固液區(qū)存在著熱和力的平衡。只有通過調(diào)節(jié)工藝參數(shù)，維持固液界面的良好位置，才能拉鑄出表面光滑的線材。
關(guān)鍵字: 連續(xù)鑄造； 定向凝固； 加熱鑄型；缺陷
heated mold continuous casting
（1. School of Materials Science and Technology，
Gansu University of Technology,Lanzhou 730050, P.R.China；
2. School of Materials Science and Technology，
Huazhong University of Science and Technology, Wuhan 430074, P.R.China）
Abstract:The continuous directional solidification technique of 5 kinds of special ZA alloys with eutectic, eutectoid and peritectic transformations under the condition of continuous casting by heated mold was studied. The optimum fitting range of technique factors in each alloy is found. The results show that the operation of guiding ingot is the key of the technique to produce directional solidification ZA alloy line by heated mold in continuous casting method. Outlet temperature, pulling speed, cooling condition, alloy composition and pressure head have direct influences on the surface quality of ingot. There is a balance between heat and force in the two-phase zone of solid and liquid. Only adjusting technique factors with the balance and keeping a good place of the interface between solid and liquid, can the smooth ZA alloy line be continuously pulled out.
Key words: continuous casting; directional solidification; heated mold; defects
