波纹辊轧制温度对镁/铝复合板界面组织及力学性能的影响

Effect of Rolling Temperature of Corrugated Roll on the Interface Structure and Mechanical Properties of Mg/Al Composite Plate

采用波纹型轧辊制备镁铝复合板,与传统平轧方法作对比,研究轧制温度对复合板界面结合状态、基体显微组织和力学性能的影响。同时建立了二维轧制模型,分析了波纹辊轧制和平辊轧制过程中应变的变化。结果表明,相同的轧制温度下,波纹辊轧制可以有效提高镁铝双金属的结合效率,实现有效结合的临界温度从平辊轧制的300~350℃降低至250℃。随着轧制温度的升高,元素扩散层厚度逐渐增加,未发现中间化合物生成。仿真结果分析表明,波谷处的等效应变明显高于波峰处,平辊轧制的等效应变介于波峰与波谷之间,轧制温度的变化对等效应变的影响较小。波纹辊制备镁铝复合板的抗拉强度高于同温度下平辊制备的复合板,复合板抗拉强度随轧制温度的升高先升高后降低,在350℃时抗拉强度达到峰值(310 MPa)。

In this study,thecorrugated roll was used to prepare the magnesium aluminum composite plate.Compared with the traditional flat rolling,the effect of rolling temperature on the bonding interface state,microstructure and mechanical properties of the composite plate was studied.At the same time,a two-dimensional rolling model was established to analyze the change of strain during the rolling process.The results showed that at the same rolling temperature,corrugated roll could effectively improve the bonding efficiency of Mg/Al bimetal,and the critical bonding temperature reduced from 300—350℃to 250℃.With the increase of rolling temperature,the thickness of diffusion layer increased gradually,and no intermediate compounds were found.According to the simulation results,the equivalent strain at the trough was obviously higher than that of peak,and the strain of flat rolling was between the peak and the trough.Rolling temperature exhibited little effect on the equivalent strain.The tensile strength of Mg/Al composite plate made by corrugated roll was higher than that made by flat roller at the same temperature.The tensile strength of composite plate increased first and then decreased with the increase of rolling temperature,and reached the peak value as 310 MPa at 350℃.