限制性模压强塑性变形对7075铝合金厚板晶粒细化效果研究  

Grain Refinement Effect of 7075 Aluminum Alloy Thick Plate by Constrained Groove Pressing with Severe Plastic Deformation

作　　者：成子豪 吴广善 陈飞[1] CHENG Zi-hao;WU Guang-shan;CHEN Fei(National Die&Mold CAD Engineering Center,Shanghai Jiao Tong University,Shanghai 200030,China)

机构地区：[1]上海交通大学模具CAD国家工程研究中心,上海200030

出　　处：《精密成形工程》2022年第4期38-45,共8页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(U2037204)。

摘　　要：目的研究热轧态7075铝合金厚板经限制模压变形后微观组织演变情况。方法利用ABAQUS有限元软件对限制模压变形压弯过程进行模拟仿真,得到限制模压压弯试样等效应变分布情况,对160 mm×160 mm×15 mm的7075铝合金试样分别开展限制与非限制性模压变形物理实验。结果380℃时非限制性模压变形试样变形至4道次发生明显开裂,限制模压变形试样变形至5道次未出现裂纹。结论2种变形方式均可实现组织晶粒细化,与非限制性模压变形试样相比,限制模压变形试样组织晶粒细化效果更显著,且组织中不同角度晶界分布更均匀,晶体取向更集中。The work aims to study the microstructure evolution of hot rolled 7075 aluminum alloy thick plate after con-strained groove pressing deformation.The finite element software ABAQUS was used to simulate the bending process of the constrained groove pressing,and the equivalent strain distribution of the constrained groove pressing and bending samples was obtained.The constrained and unconstrained groove pressing physical experiments were carried out on the 160 mm×160 mm×15 mm 7075 aluminum alloy samples respectively.At 380℃,obvious cracking occurred in the unconstrained groove pressing after 4 passes of deformation,and no cracks appeared in the constrained groove pressing after 5 passes of deformation.Both of the two deformation modes can achieve grain refinement.Compared with the unconstrained groove pressing sample,the grain refinement effect of the constrained groove pressing sample is more significant,the distribution of grain boundaries at dif-ferent angles in the microstructure is more uniform,the crystal orientation is more concentrated.

关 键 词：强塑性变形 限制模压 晶粒细化 7075铝合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程]