期刊
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
卷 30, 期 11, 页码 8257-8275出版社
SPRINGER
DOI: 10.1007/s11665-021-06044-0
关键词
dynamic recrystallization; friction correction; numerical simulation; Ti-6Al-4V titanium alloy
资金
- National Natural Science Foundation of China [51905501]
- Tangshan talent foundation innovation team [20130204D, 18130216A]
- S&P Program of Hebei [19012204Z]
- Key Research and Development Plan of Tangshan Science and Technology [19140203F]
The study investigated the microstructure evolution and hot compression behavior of TC4 titanium alloy under different deformation conditions through experiments and simulations. The results showed that higher temperatures and lower strain rates promoted DRX behavior, and the softening effect increased significantly with temperature during compression at certain strain rates. A DRX kinetics model was established to predict volume fraction and grain size, and the relationship between microstructure, deformation behavior, and mechanical properties was discussed. The finite element model combined with kinetic equations accurately predicted the microstructure after hot compression, demonstrating excellent applicability and potential in predicting mechanical properties.
The Ti-6Al-4V (TC4) is subjected to an isothermal compression test by the Gleeble-3800 thermal simulation testing machine, and the stress-strain curve is obtained, and the experimental data are corrected by friction. Through dynamic recrystallization (DRX) dynamic analysis and simulation, the microstructure evolution and hot compression behavior of TC4 titanium alloy under different deformation conditions are studied. The DRX behavior confirmed by microstructure observation is promoted at higher temperature and lower strain rate. In the compression process, when (epsilon) over dot = 1s(-1), its softening effect increases significantly with the increase in temperature. When (epsilon) over dot = 0:001s(-1) and (epsilon) over dot = 0.01s(-1), the softening effect is not obvious. At 1223K, the flow softening extent increases with the increase in strain rate where DRX plays a dominate role in the softening behavior. TC4 titanium alloy has obvious discontinuous yield behavior under high-temperature compression deformation conditions, and the yield value is not significantly correlated with the increase in deformation temperature. The DRX kinetics model was established to calculate the volume fraction and grain size of DRX under the investigated deformation parameters. In addition, the relationship between microstructure and deformation behavior and mechanical properties is also discussed. The excellent correlation shows that the organization and mechanical properties can be controlled by selecting suitable deformation parameters. Finally, the finite element model is combined with the kinetic equation to predict the microstructure of TC4 titanium alloy after hot compression. The result shows that the predicted value is highly consistent with the experimental value. The error of the recrystallization volume fraction does not exceed 10%. This shows that the model has excellent applicability in current research and has huge practical application potential in predicting the mechanical properties of TC4 titanium alloy after hot working.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据