AZ31镁合金板的热冲压成形研究  

Study on Hot Stamping of AZ31 Magnesium Alloy Sheet

作　　者：郭晓明 张晓蕾 王子健 项重辰 丁汉林 GUO Xiaoming;ZHANG Xiaolei;WANG Zijian;XIANG Chongchen;DING Hanlin(School of Iron and Steel,Soochow University,Suzhou 215137,China)

机构地区：[1]苏州大学沙钢钢铁学院,江苏苏州215137

出　　处：《热加工工艺》2024年第15期39-43,48,共6页Hot Working Technology

基　　金：国家自然科学基金青年基金项目(51905189)。

摘　　要：为了改善AZ31镁合金板的成形性,对其2 mm厚的挤压板分别在25(室温)、250、300、350、400℃五个温度进行热冲压成形。通过回弹角测量、组织观察和力学性能测试,研究冲压成形温度对其回弹性能和显微组织、力学性能的影响。结果表明,室温冲压成形时,冲压件底部弯角处有细微的裂纹,且回弹现象较明显;随着冲压成形温度升高,AZ31镁合金板的成形性能得到明显改善,回弹现象减弱。镁合金冲压板材的显微组织在室温下无孪晶产生,随着温度升高开始产生孪晶,在250、300、350℃中均有大量孪晶生成,到达400℃后孪晶开始减少至消失,材料发生再结晶现象,晶粒细化。In order to improve the formability of AZ31 magnesium alloy sheet,the 2 mm thick extruded sheet was hot stamped at five temperatures of 25(room temperature),250,300,350,and 400℃,respectively.Through springback angle measurement,microstructure observation and mechanical property test,the effects of stamping temperature on its springback,microstructure and mechanical properties were studied.The results show that there are fine cracks at the corners of the bottom of the stamping parts during room temperature stamping,and the springback phenomenon is obvious;with the increase of the stamping temperature,the formability of AZ31 magnesium alloy sheet is significantly improved,and the springback phenomenon is weakened.The microstructure of the magnesium alloy stamping sheet has no twins at room temperature.Twins begin to form as the temperature increases.A large number of twins are formed at 250℃,300℃and 350℃.After reaching 400℃,the twins begin to decrease even disappear,the material undergoes recrystallization,and the grains are refined.

关 键 词：AZ31镁合金 热冲压成形 显微组织 力学性能 

分 类 号：TG306[金属学及工艺—金属压力加工] TG389