摘要
采用宏观有限元模拟与微观晶体塑性分析相结合的方法对六道次热轧ZK61镁合金中厚板的晶体内应力和织构演化进行研究。根据轧制实验与拉伸实验建立相应同步热轧模型并进行仿真计算,将模拟结果作为边界条件代入到基于Voronoi图的多晶体塑性模型中,再应用晶体塑性有限元方法对多晶体模型进行同步热轧模拟,得到各道次热轧态ZK61镁合金的塑性参数和织构极图,并分别与拉伸实验结果和电子背散射衍射实验导出的织构极图进行对比分析,归纳出不同道次下热轧ZK61镁合金晶体塑性变形与织构演化机制。结果表明:经多道次热轧后的ZK61板材存在大量孪晶与动态再结晶,晶粒均匀细化效果明显,其基面织构极密度与轧制道次整体呈正相关,不同道次下的峰值取向差角存在较大差异(8°、28°、88°),且合金力学性能得到改善,强度提升了7.55%,伸长率达到19.5%。
The crystal internal stress and texture evolution of six-pass hot rolled ZK61 magnesium alloy plate are studied by means of combining macroscopic finite element simulation and microscopic crystal plasticity analysis.According to the rolling experiment and tensile test,the corresponding synchronous hot rolling model is established and simulated,and the simulation results are entered as boundary conditions in the polycrystalline plasticity model based on Voronoi diagram.Then the crystal plasticity finite element method is used to simulate the synchronous hot rolling of the polycrystalline model,and the plastic parameters and texture pole figures of the hot-rolled ZK61 magnesium alloy in each pass are obtained.Compared with the tensile test results and the texture pole figures derived from the electron backscatter diffraction experiment,the crystal plastic deformation and texture evolution mechanism of the hot-rolled ZK61 magnesium alloy under different passes are summarized.The results show that there are a large number of twins and dynamic recrystallization in the ZK61 plate after multi-pass hot rolling,the grain homogenization and refinement effect is obvious.The pole intensity of basal texture is correlated with the whole rolling passes,the peak misorientation angle of the alloy under different passes has a quite diversity(8°,28°,and 88°),and the mechanical properties of the alloy are improved.The alloy strength is increased by 7.55%,and the elongation is achieved by 19.5%.The results can provide reference for improving the plastic processing ability of magnesium alloy.
作者
卫宏喆
陈明
王浩雷
刘庆杰
胡小东
赵红阳
WEI Hongzhe;CHEN Ming;WANG Haolei;LIU Qingjie;HU Xiaodong;ZHAO Hongyang(School of Mechanical Engineering and Automation,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China;School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China)
出处
《材料工程》
北大核心
2025年第6期172-187,共16页
Journal of Materials Engineering
基金
辽宁省教育厅重点基金(LJKZ0281)。
关键词
ZK61镁合金
热轧
数值模拟
晶体塑性有限元方法
微观结构
织构演化
力学性能
ZK61 magnesium alloy
hot rolling
numerical simulation
crystal plasticity finite element method
microstructure
texture evolution
mechanical property
