钛合金铸件精密成形理论与技术研究进展

Research Progress on Theory and Technology Concerning Precision Forming of Titanium Alloy Castings

由于航空、航天用零部件对材料比强度有很高的要求,因此钛合金作为一种高比强合金在航空、航天领域的应用越来越多,而且这类零部件常采用薄壁复杂结构。若采用水冷坩埚方式熔炼钛合金,会导致钛合金熔体流动性差,因此,离心铸造方法已成为钛合金薄壁复杂铸件精密成形的主要方法。介绍了离心场下钛合金铸件精密铸造成形理论及技术的发展过程,在此基础上总结了离心场下钛合金熔体的充型、凝固行为及铸件缺陷形成规律,提出了立式离心铸造技术改进方案,并对未来离心场下成型理论与技术的发展提出了展望。

As the aviation, aerospace components has high specific strength of the material requirements, so as high specific strength titanium alloys in the aviation, aerospace applications, more and more of these components often used in thin-walled and complex structure. If the water-cooled crucible melting titanium alloy way, will lead to titanium melt flow is poor, therefore, centrifugal casting method of thin-walled titanium complex has become the main method of forming precision castings. The development process of theory and technology concerning precision forming of titanium alloy castings in centrifugal field was introduced, followed by a summary of the formation law of casting defects, solidification behavior and mold filling of titanium alloy in this paper, and thus the improvement scheme of vertical centrifugal casting was proposed. Finally, the development of forming theory and technology in centrifugal field was pointed out to aid future work.