变厚度轧制对AZ31镁合金板材边部损伤影响分析  

Variable Gauge Rolling Impact on the Edge Damage of AZ31 Magnesium Alloy Sheets

作　　者：韦建春 黄庆学[1] 黄志权[1] 朱艳春[1] 

机构地区：[1]太原科技大学重型机械教育部工程研究中心,山西太原030024

出　　处：《稀有金属材料与工程》2018年第2期652-656,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51501122;51604181);山西省科技创新项目(2015172);太原科技大学研究生创新项目(20151020);太原科技大学校博士科研启动基金(20142033)

摘　　要：基于变厚度轧制工艺理论,利用DEFORM-3D软件对AZ31镁合金板材轧制边部损伤行为进行分析。设定轧制温度为350℃,轧辊转速为20 r/min,先对3组试样进行压下量分别为板厚的37.5%,75%和112.5%立轧预变形;随后进行小压下量多道次或大压下量单道次的平辊轧制。结果表明:对镁合金板采用变厚度轧制工艺能显著减少其边部损伤;立辊侧压量为37.5%时效果最好,其最大损伤因子为0.35;变厚度轧制工艺更适用于大压下轧制,当立辊侧压量为75%,平辊压下量为49%时最大损伤因子最小,仅为0.126;侧压量的取值与板厚有关。The edge damage behavior of AZ31 magnesium alloy plate was investigated by finite element software DEFORM, which is based on variable gauge rolling. The rolling temperature of magnesium plate was 350 ℃, the rolling speed was 20 r/min and the lateral pre-deformation by vertical roll were 37.5%, 75% and 112.5% of plate thickness. Then the specimens that had been pre-deformed were rolled by flat roll with multi cycles of small reduction or single cycle with a large deformation. The results show that the variable gauge rolling process can significantly reduce edge damage of rolled magnesium plate. When vertical roll reduction is 37.5%, the variable gauge rolling process reach the best, and the maximum edge damage factor is 0.35. Variable gauge rolling process seems to be more suitable for large reduction rolling. The maximum damage factor is only 0.126 when vertical reduction is 75% and flat reduction is 49%. The value of vertical roll reduction is related to the initial thickness of magnesium plate.The edge damage behavior of AZ31 magnesium alloy plate was investigated by finite element software DEFORM, which is based on variable gauge rolling. The rolling temperature of magnesium plate was 350 ℃, the rolling speed was 20 r/min and the lateral pre-deformation by vertical roll were 37.5%, 75% and 112.5% of plate thickness. Then the specimens that had been pre-deformed were rolled by flat roll with multi cycles of small reduction or single cycle with a large deformation. The results show that the variable gauge rolling process can significantly reduce edge damage of rolled magnesium plate. When vertical roll reduction is 37.5%, the variable gauge rolling process reach the best, and the maximum edge damage factor is 0.35. Variable gauge rolling process seems to be more suitable for large reduction rolling. The maximum damage factor is only 0.126 when vertical reduction is 75% and flat reduction is 49%. The value of vertical roll reduction is related to the initial thickness of magnesium plate.

关 键 词：AZ31镁合金 变厚度轧制 DEFORM-3D 边部损伤 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG339[金属学及工艺—金属材料]