温电耦合轧制中预热温度对AZ31镁合金铸轧板组织及性能的影响  

Effect of preheating temperature on microstructure and properties for AZ3 magnesium alloy cast-rolled sheet in thermo-electropulsing rolling

作　　者：白珊 王仪青 卢云 高翔宇[1] Bai Shan;Wang Yiqing;Lu Yun;Gao Xiangyu(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;Yangquan Coal Industry Group Huayue Machinery Co.,Ltd.,Yangquan 045000,China;Shanxi Long Yuan New Energy Co.,Ltd.,Taiyuan 030006,China)

机构地区：[1]太原科技大学机械工程学院,山西太原030024 [2]阳泉煤业集团华越机械有限公司,山西阳泉045000 [3]山西龙源新能源有限公司,山西太原030006

出　　处：《锻压技术》2025年第1期113-121,共9页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(52075357);国家重点研发计划资助项目(2018YFA0707301);山西省基础研究计划青年项目(202203021212313)。

摘　　要：“非热效应”是温电耦合轧制(TER)提升镁合金成形能力的重要机制,该“非热效应”的激发需要一定的温度作为能量基础,而过高的预热温度又会抑制“非热效应”的发挥,选择合理的预热温度成为温电耦合轧制镁合金的关键。针对此问题,研究了不同预热温度下温轧(WR)和温电耦合轧制(TER)工艺对AZ31镁合金铸轧板组织和力学性能的影响。结果表明,TER中的脉冲电流可以加速动态再结晶过程,细化均匀组织。脉冲电流的“非热效应”和温度有强相关性,其可以通过在较低温度下促进再结晶来提升轧板的力学性能,本质是“非热效应”可以加速合金内部的位错运动及空位扩散。在预热温度为150~300℃内,相同预热温度下TER工艺的样品在抗拉强度和伸长率方面均优于WR工艺的样品,其中200℃时,TER工艺板材的综合力学性能较优,相比于相同预热温度下的WR工艺板材,抗拉强度提升了约20.6%,伸长率增长了约232.9%。The“non-thermal effect”is an important mechanism for improving the formability of magnesium alloys in thermo-electropulsing rolling(TER),which is excited by a specific temperature as the energy basis,but the excessively high preheating temperature suppresses the exertion of the“non-thermal effect”.Therefore,reasonable selection of preheating temperature becomes the key to magnesium alloy TER.In response to this issue,the influences of warm rolling process(WR)and thermo-electropulsing rolling(TER)at different preheating temperatures on the microstructure and mechanical properties of Az31 magnesium alloy cast-rolled sheet were studied.The results show that the pulse current in TER can accelerate the dynamic recrystallization process and refine the uniform structure.The“non-thermal effect”of the pulse current has a strong correlation with the temperature,which can improve the mechanical properties of the rolled sheet by promoting recrystallization at a lower temperature and accelerate dislocation movement and vacancy diffusion inside the alloy.Within the preheating temperature of 150-300 C,the sample of TER process is superior to the sample of WR process in terms of tensile strength and elongation at the same preheating temperature.At 200 C,the comprehensive mechanical properties of the sheet in TER process are better.Compared with the sheet of WR process at the same preheating temperature,the tensile strength of TER process is increased by about 20.6%and the elongation is increased by about 232.9%.

关 键 词：AZ31镁合金 脉冲电流 轧制 伸长率 抗拉强度 

分 类 号：TG335[金属学及工艺—金属压力加工]