AZ31B镁合金轧制过程中的温升效应研究

Study on the temperature rise effect of AZ31B Mg alloy during rolling

摘要:

本研究采用内镶测温偶原位测量的方法测定了AZ31B 镁合金在不同轧制工艺条件下的温度变化过程。结果表明：整个温度变化过程分为变形过程（0.02~0.08s）和温度均匀过程（0.8~1.2s）。这两个阶段的温升值都与压下量正相关，而与初轧温度反相关。在200℃45%压下量轧制时两温升值分别达到80℃和35℃。在此基础上建立经验公式来预测温升。变形热引起的温升效应显著影响轧板的组织和再结晶行为。

Abstract:

The temperature change history of AZ3lB Mg alloy was measured under different rolling conditions. An in situ measurement method through inlaid thermocouples was used. The results show the whole temperature variation process consisted of deformation process(0.02~0.08s) and subsequent temperature homogenizing process(0.8~1.2s). The temperature rises in these two stages both increased with either increased reduction or decreased initial rolling temperature. Those two temperature rises reached 80℃ and 35℃, respectively, for 45% rolling at 200℃. On this basis, two empirical formulas were established to predict temperature rises. The deformation induced temperature rise significantly affected the microstructure and recrystallization behavior of rolled sheet.