摘要
针对普通平轧制备复合板存在的结合强度低、轧后弯曲严重等难题,采用波平轧工艺制备Mg/Al复合板,并对其进行力学性能测试。波平轧制备的Mg/Al复合板抗拉强度为324.50 MPa,比普通平轧提高了11.8%;剪切强度为82.55 MPa,比普通平轧提高了8.0%。通过建立波纹轧Mg/Al复合板三维热-力耦合有限元模型,分析轧制过程中应力、应变、温度变化规律。波纹轧过程中镁板表面剪应力方向发生多次改变,变形区内交替出现多个前滑区与后滑区,形成多个搓轧区。这种剪切作用产生了更多的变形热,提升了镁板温度,协调了异种金属变形。融合有限元得到的变形区金属温度、应变随时间的变化规律,利用轧卡试验研究了波纹轧变形区内特征位置的微观组织演变规律,并揭示了波纹轧Mg/Al复合板的结合机理。
In order to solve the problems of low bonding strength and serious shape warpage of composite plates prepared by traditional flat roll rolling process,Mg/Al clad plates were prepared by corrugated+flat rolling and the mechanical properties were tested.The tensile strength of the Mg/Al composite plate obtained by corrugated+flat rolling is 324.50MPa,which is 11.8%higher than the traditional flat rolling;the shear strength is 82.55MPa,which is 8.0%higher than the traditional flat rolling.A three-dimensional thermal-mechanical coupled finite element model for corrugated rolling of Mg/Al clad plates was established,and the changes in stress,strain,and temperature during the rolling process were analyzed.During the corrugated rolling process,the direction of shear stress on the surface of the Mg plate changes multiple times,leading to the alternating presence of multiple forward slip zones and backward slip zones within the deformation zone,and the formation of multiple cross shear zones.This shearing action generated additional deformation heat,increased the temperature of the Mg plate,and coordinated the deformation of dissimilar metals.By integrating the characteristics of metal temperature and strain distribution obtained from finite element model,the microstructure evolution at characteristic positions in the corrugated rolling deformation zone was analyzed through rolling block experiments,and the bonding mechanism of Mg/Al clad plate prepared by corrugated rolling was revealed.
作者
刘元铭
刘延啸
申宏卓
王振华
王涛
LIU Yuanming;LIU Yanxiao;SHEN Hongzhuo;WANG Zhenhua;WANG Tao(College of Mechanical Engineering,Taiyuan University of Technology,Taiyuan 030024;Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment,Ministry of Education,Taiyuan 030024;National Key Laboratory of Metal Forming Technology and Heavy Equipment,Taiyuan 030024)
出处
《机械工程学报》
北大核心
2025年第8期85-97,共13页
Journal of Mechanical Engineering
基金
国家自然科学基金(52375367,52105390,52205404,52311530768)
山西省高等学校科技创新(2024Q008)资助项目。
关键词
Mg/Al复合板
波纹轧
力学性能
组织演变
Mg/Al Clad plate
corrugated rolling
mechanical properties
microstructure evolution
