(1. 重慶大學(xué) 材料科學(xué)與工程學(xué)院, 重慶 400030;
2. 重慶大學(xué) 國(guó)家鎂合金材料工程技術(shù)研究中心, 重慶 400044)
摘 要: 對(duì)鎂合金板材軋制過(guò)程的熱量變化方程進(jìn)行推導(dǎo)，并用有限元方法分析此熱力耦合過(guò)程，并對(duì)仿真結(jié)果進(jìn)行實(shí)驗(yàn)驗(yàn)證。結(jié)果表明：板材在軋制過(guò)程中有較大的溫度變化，軋制過(guò)程板料的溫度變化主要是由變形產(chǎn)熱、摩擦生熱和板料−軋輥熱傳導(dǎo)、以及與環(huán)境的傳熱情況決定，并且受板和軋輥間溫度差的影響；隨著板溫度的下降，軋制力和等效應(yīng)力線性增加，最大軋制力是最小軋制力的3倍；當(dāng)溫度降到210 ℃，等效應(yīng)力達(dá)到160 MPa時(shí)，板料出現(xiàn)邊裂缺陷，達(dá)到軋制成型極限；板料較佳軋制溫度應(yīng)高于210 ℃。
關(guān)鍵字: 鎂合金；軋制；有限元；溫度梯度
magnesium alloy sheets with temperature gradient
（1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China）
Abstract:The quantity change equation of heat during the rolling of magnesium alloy was derived, and the finite element method was used to analyze the thermal-mechanical process. The simulation results were proved by confirmatory experiments. The results show that, there is a great temperature change in the rolled sheet, and the temperature change depends upon the plastic deformation heat, friction heat and heat transfer between sheet and roller, sheet and environment. The temperature difference between the sheet and roller has some effects on the change. With the temperature decreasing, the rolling force and equivalent stress increase linearly, and the maximum rolling force is 3 times as the minimum rolling force. When the temperature drops to 210 ℃, the equivalent stress is 160 MPa, and the edge cracks are generated, which is the deformation limit of AZ31 magnesium rolling. The lowest temperature of AZ31 magnesium rolling without edge cracks is 210 ℃.
Key words: magnesium alloy; rolling; finite element analysis; temperature gradient
