铸造技术2025，Vol.46Issue(11)：1097-1106,10.DOI:10.16410/j.issn1000-8365.2025.5197
大尺寸变截面ZTA15钛合金铸件铸造工艺模拟仿真研究
Simulation Study on the Casting Process of Large-scale Variable-section ZTA15 Titanium Alloy Castings
摘要
Abstract
Large-scale thin-walled variable-section ZTA15 titanium alloy castings hold significant application potential in the manufacture of complex,variable-section nozzle components for aeroengines.However,the casting process is highly sensitive to wall thickness parameters,leading to issues such as uneven mold filling,imbalanced temperature distributions,and solidification defects.ProCAST software was employed to conduct numerical simulations of the pouring and filling process,temperature field,velocity field,and solidification behavior of ZTA15 titanium alloy castings with different wall thicknesses(i.e.,2.0,3.5,and 8.0 mm).The results reveal that the 2.0 mm thick-walled castings exhibit excessive filling velocity,resulting in vortex and porosity defects.The 8.0 mm thick-walled castings experience prolonged solidification time,increasing the risk of shrinkage cavities.In contrast,the 3.5 mm wall thickness yields a uniform temperature field and a reasonable solidification sequence,with initial cooling occurring at the cross-shaped runner and the first layer of reinforcing ribs,followed by accelerated cooling of the large flat thin-walled surface in the later stages.Shrinkage porosity and cavities are observed across all wall thicknesses,primarily concentrated at the junction of the central sprue and the cross-shaped runner,as well as in the thicker regions near the reinforcing ribs.These defects are attributed to localized variations in cooling rates,leading to thermal stress concentration.No significant isolated liquid phase regions are found on the large flat thin-walled surfaces,indicating that optimizing the pouring velocity and time can effectively mitigate defects.关键词
ZTA15钛合金/精密熔模铸造/大尺寸变截面/缩孔缺陷Key words
ZTA15 titanium alloy/investment casting/large-scale variable-section/shrinkage porosity defect分类
矿业与冶金引用本文复制引用
张林嘉,周瑜,罗婷,李金山..大尺寸变截面ZTA15钛合金铸件铸造工艺模拟仿真研究[J].铸造技术,2025,46(11):1097-1106,10.基金项目
国家科技重大专项(2024ZD0608100) （2024ZD0608100）
国家自然科学基金(52401198) （52401198）
陕西省秦创原引用高层次创新创业人才项目(OCYRCXM-2022-239) （OCYRCXM-2022-239）
