(1. 上海大學(xué) 材料科學(xué)與工程學(xué)院，上海 200072；
2. 蘇州有色金屬研究院有限公司 材料工藝研究所，蘇州 215026)
摘 要: 結(jié)合鎂合金鑄軋工藝特點，分析鎂合金板坯鑄軋過程中凝固層焊合點位置與板坯缺陷的影響規(guī)律；針對板坯厚度、鑄軋區(qū)長度及鑄軋速度等關(guān)鍵參數(shù)，簡化凝殼徑向生長及凝固前沿周向轉(zhuǎn)動過程，確定鑄軋速度匹配范圍，建立凝固層焊合點位置控制模型，并通過工藝試驗對控制模型進(jìn)行驗證。結(jié)果表明：通過理論模型確定工藝匹配范圍，可穩(wěn)定并優(yōu)化鎂合金鑄軋工藝，大幅度降低鑄軋板坯宏觀缺陷，獲得表面光潔、質(zhì)量良好的鎂合金鑄軋板坯。
關(guān)鍵字: 鎂合金；雙輥鑄軋；凝固層焊合點；控制模型；工藝優(yōu)化
（1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;
2. Department of Materials Science and Technology, Suzhou Nonferrous Metals Research Institute,
Suzhou 215026, China）
Abstract:The effect of kiss-point position of solidification layer of twin-roll casting on macro-defects of magnesium alloys strip was analyzed through experiments and theoretical derivation. A kiss-point model which considers the strip thickness, set-back length and roll speed was established to optimize the process and enhance the surface quality of magnesium alloys strip. The results show that the model of kiss-point of solidification layer effectively stabilizes and optimizes the twin-roll casting processing, and the defect-free magnesium alloys strip is obtained by twin-roll casting.
Key words: magnesium alloys; twin-roll casting; kiss-point of solidification layer; model; process optimization
