小压下率镁/铝复合板热轧模拟及微观组织研究  

Study on hot rolling simulation and microstructure of Mg/Al composite plates with small reduction ratios

作　　者：贾皓月 黄志权[1] 江连运[1] 王涛 JIA Hao-yue;HUANG Zhi-quan;JIANG Lian-yun;WANG Tao(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学机械工程学院,山西太原030024 [2]太原理工大学机械与运载工程学院,山西太原030024

出　　处：《塑性工程学报》2025年第2期56-67,共12页Journal of Plasticity Engineering

基　　金：国家自然科学基金面上资助项目(52075357);国家重点研发计划(2018YFA0707301);太原科技大学博士科研启动基金资助项目(20242001);来晋工作优秀博士科研资助项目(20242085);山西省高等学校科技创新计划(2024L256)。

摘　　要：通过在400℃下进行单道次热轧获得未结合、部分结合和结合3种状态的小压下率镁/铝复合板。使用电子背散射衍射(EBSD)方法分析了临界压下率下镁/铝复合板的微观组织演化,同时运用ABAQUS有限元软件建立了热轧镁/铝复合板热-力耦合模型,分析了压下率对初始结合阶段的应力、等效塑性应变和摩擦剪切应力的影响。仿真结果显示,10%压下率下复合板未结合,临界压下率为14.5%,19%~28%压下率下复合板相结合,但通过摩擦剪切应力及等效塑性应变分析发现,压下率为19%时,由于界面不协调变形,附加应力场的破坏作用使已初步结合的复合板界面剥离,结果与实验吻合。经EBSD分析,由于临界点I轧制力提供的能量低,镁铝两侧以亚稳状态的亚晶为主,压下率增大到临界点II时,亚晶多转变为形变组织。The unbonded,partially bonded and bonded Mg/Al composite plates with small reduction ratios were obtained by single-pass hot rolling at 400℃.The microstructure evolution of Mg/Al composite plates with critical reduction ratio was studied by electron backscattering diffraction(EBSD)method.At the same time,the thermo-mechanical coupling model of hot rolled Mg/Al composite plates was established by ABAQUS finite element software,and the effects of reduction ratio on stress,equivalent plastic strain and friction shear stress were analyzed.The simulation results show that the composite plates are unbonded with reduction ratio of 10%,the critical reduction ratio is 14.5%,and the composite plates are bonded with reduction ratio of 19%-28%.However,through the friction shear stress and equivalent plastic strain analysis,it is found that when the reduction ratio is 19%,due to the uncoordinated deformation of the interface,the interface of composite plate bonded initially is peeled off by the damage of the additional stress field,and the results are in good agreement with the experiments.According to EBSD analysis,due to the low energy provided by rolling force at critical point I,the metastable subgrains are dominant on both sides of Mg and Al.When the reduction ratio increases to critical point II,the subgrains are mostly transformed into deformed structure.

关 键 词：镁/铝复合板 热轧 有限元模拟 微观组织 

分 类 号：TG335.81[金属学及工艺—金属压力加工]