γ-TiAl增压涡轮熔模铸造过程数值模拟研究  

Research on Numerical Simulation of Investment Casting Process for Gamma Titanium Aluminide Turbocharger

作　　者：梁作俭[1] 许庆彦[1] 李俊涛[2] 李世琼[2] 张继[2] 柳百成[1] 仲增墉[2] 

机构地区：[1]清华大学,北京100084 [2]北京钢铁研究总院,北京100081

出　　处：《稀有金属材料与工程》2003年第3期164-169,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学重大基金项目(59990473);国家重点基础研究项目(G2000067208-3);清华大学基础研究基金资助

摘　　要：根据熔模型壳离心浇注的铸造工艺特点,建立了γ-TiAl增压涡轮凝固传热过程的数值模型,推导了离心压力下γ-TiAl金属间化合物的凝固收缩和补缩过程数学模型,模拟计算了γ-TiAl增压涡轮铸件的温度场和收缩缺陷。结果表明,模型能可靠计算γ-TiAl增压涡轮铸件凝固过程的温度分布和准确预测铸件的收缩缺陷,数值模拟结果与实验结果吻合良好。数值模拟结果证实了前期工作所提出的进一步减少及消除收缩缺陷的优化工艺措施的合理性。Considering the characteristics of centrifugal casting technology with investment shell, the mathematical model of solidification process of gamma titanium aluminide turbochargers was established, and the model for shrinking and feeding was deduced under the condition of centrifugal pressure. Then, temperature field and shrinkage defects of gamma titanium aluminide turbocharger with different technologies were simulated. The results showed that the temperature distribution could be calculated and the shrinkage defects could be predicted with the model, and the simulation results coincided with the experimental results quite well. It is indicated that the optimum process to remove shrinkage defects presented in the preceding paper is rational.

关 键 词：Γ-TIAL 数值模拟 熔模铸造 收缩缺陷 增压涡轮 

分 类 号：TG292[金属学及工艺—铸造] TG249.5[机械工程—精密仪器及机械]