针对镁/铝层合板轧制过程中存在结合强度低、翘曲和边裂严重等技术难题,研究了基于点阵强变形轧制(Lattice severe deformation rolling,LSDR)原理以波纹辊对其一道次轧制成形。借助有限元数值计算分析了金属板材在复杂辊缝下的塑性流...针对镁/铝层合板轧制过程中存在结合强度低、翘曲和边裂严重等技术难题,研究了基于点阵强变形轧制(Lattice severe deformation rolling,LSDR)原理以波纹辊对其一道次轧制成形。借助有限元数值计算分析了金属板材在复杂辊缝下的塑性流动规律和成形特点,并进行了轧制实验。结果表明:LSDR原理轧制镁/铝层合板时,波纹辊能够对难变形的镁合金及结合界面处产生点阵状分布的局部强非均匀变形作用,增强镁合金沿轧向(Rolling direction,RD)和横向(Transverse direction,TD)的塑性流动,并在结合界面处产生更大的剪切应力。相较于传统平轧,LSDR原理轧制所得镁/铝层合板的抗拉强度、拉剪强度和抗弯强度均有提高,其中拉剪强度最大增幅达77%;并且结合界面均匀可靠,产生约5μm厚的扩散层。研究内容为高质量镁/铝层合板的制备提供了有价值的参考。展开更多
The effect of different surface treatments on the bonding strength of composite plates was investigated under the conditions of 400℃ and reduction ratio of 45%.Results show that the wire brush grinding treatment can ...The effect of different surface treatments on the bonding strength of composite plates was investigated under the conditions of 400℃ and reduction ratio of 45%.Results show that the wire brush grinding treatment can only eliminate the oxide film on the plate surface,but it can hardly produce a hard layer on the plate surface.The bonding effect depends on the element diffusion promoted by the close contact between the metals on both sides of the interface.After anodic oxidation,there is a hard layer on the metal surface,and the hard layer broken during the rolling process forms a mechanical occlusion at the bonding interface.However,the hard layer cannot form an effective combination with the metal at the interface,and the bonding can only occur in the fresh metal bonding area at the crack of the hard layer.The acid-alkali washing treatment can completely remove the hard layer on the surface of both alloys without increasing the surface roughness of the plate,and the metal on both sides of the interface is more closely bonded during the rolling process.The optimal bonding strength can be obtained by surface treatment of acid-alkali washing for the aluminum-magnesium hot-rolled bonding.展开更多
基金National Key Research and Development Program(2018YFA0707300)National Natural Science Foundation of China(52075472)Hebei Natural Science Foundation(E2023203129)。
文摘The effect of different surface treatments on the bonding strength of composite plates was investigated under the conditions of 400℃ and reduction ratio of 45%.Results show that the wire brush grinding treatment can only eliminate the oxide film on the plate surface,but it can hardly produce a hard layer on the plate surface.The bonding effect depends on the element diffusion promoted by the close contact between the metals on both sides of the interface.After anodic oxidation,there is a hard layer on the metal surface,and the hard layer broken during the rolling process forms a mechanical occlusion at the bonding interface.However,the hard layer cannot form an effective combination with the metal at the interface,and the bonding can only occur in the fresh metal bonding area at the crack of the hard layer.The acid-alkali washing treatment can completely remove the hard layer on the surface of both alloys without increasing the surface roughness of the plate,and the metal on both sides of the interface is more closely bonded during the rolling process.The optimal bonding strength can be obtained by surface treatment of acid-alkali washing for the aluminum-magnesium hot-rolled bonding.
