Development Status of Titanium Alloy Precision Casting Technology
Development Status of Titanium Alloy Precision Casting Technology
titanium alloy precision casting technology has the characteristics of high forming precision, short production cycle and good dimensional flexibility, which can be well adapted to the development of high precision and complex titanium alloy thin-walled components. Among them, graphite casting and investment casting are widely used in the aerospace field, mainly used in impellers, cabins, case products the development.
At present, foreign countries in China wen Zhongqiang titanium alloy precision casting technology is very mature, the main alloy grade is. Ti-6-4 and BT20. The precision casting of high temperature and high strength titanium alloy is mainly involved.Β-21s, BT35, Ti1100, IMI834 however, its casting process still has the disadvantages of low casting performance, difficult welding and high tendency of casting cracking.
The development needs of large, complex precision structures and high performance of titanium alloy castings in the aerospace field have rapidly promoted magnetic levitation smelting,3D hit the application and development of new technologies and processes such as printing, computer numerical simulation, and hot isostatic pressing densification in the field of precision casting.
At present,3D printing technology has been implemented1800 mm×1000 mm×700 mm integral casting shell or core the production of, its accuracy can be controlled in0.3mm within, the representative manufacturers are mainly Germany. ExOne, Voxeljet company, USA SolidScape,3DSystem co.
In addition, numerical simulation technology has been widely used in the process of filling, solidification, shrinkage and shrinkage prediction, stress distribution prediction, etc., which can effectively guide the casting process and improve the accuracy and quality of castings, at present, the mainstream numerical simulation software manufacturers include the United States. Procast, Japan Soldia germany Magma Soft, china Huazhu CAE etc.
In terms of performance improvement, hot isostatic pressing densification technology has been widely used in the post-treatment process of castings, which can cause metallurgical closure of defects, eliminate shrinkage and shrinkage holes, and improve composition segregation, the microstructure and mechanical properties of castings are effectively improved, but the problems of microstructure coarsening, phase change and deformation control of castings during hot isostatic pressing still need to be paid attention to and solved. At present, with the progress of various process technologies, titanium alloy precision casting technology has shown a trend of diversified, cross-cutting and universal technology, which can produce diameter.2m large titanium alloy castings of the order of magnitude, casting tolerances up±0. 13mm, the minimum wall thickness can be controlled1.0mm.
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