Mature Multivariate Multi-scale Titanium Matrix Composites Composition Design Has Been Established

After more than 20 years of research and accumulation, the research team of Shanghai Jiao Tong University has established a mature multivariate multi-scale titanium matrix composites composition design, stable preparation, forming and processing and heat treatment modification production and processing system. The team has successfully developed TC4-based high toughness series of titanium matrix composites and IMI834-based high temperature resistant series of titanium matrix composites, and can realise the mass production of titanium matrix composites ingots through in-situ autogenous technology. Mature isothermal forging, precision casting and other forming processes have been developed to realise the near-net forming of titanium matrix composites, and titanium matrix composites of different systems, sizes and structures can be prepared according to requirements.
In order to reduce the production cost of titanium matrix composites, Shanghai Jiao Tong University has successfully achieved the mass production of tonnes of titanium matrix composite ingots (mass 1.2t) by using industrialised vacuum self-consumption melting furnace. Isothermal precision forging of titanium matrix composite bad ingots and isothermal precision forgings. Under the optimised isothermal forging process, the forgings are able to obtain uniform organisation and stable mechanical properties. The micro-nano reinforced titanium matrix composite isothermal forgings prepared have passed the identification of new materials of Aisino-Science and Industry Group (Aisino-Science and Industry Group), and have been applied in Aisino-Science and Industry Group (Aisino-Science and Industry Group) and China Shipbuilding Heavy Industry Corporation (CSIC), with mechanical properties surpassing those of the national standard TC4 titanium alloy forgings, the utilisation rate of raw materials being increased by more than 70%, and the cost of a single part reduced by 66%. The isothermal precision forging production line with 3000t isothermal press and a full set of high-temperature-resistant moulds has been built, which can realise the precision forging of bad ingots, plates and complex components with different deformation amount.
Multi-scaled titanium matrix composite shell components and impellers prepared by precision casting technology. In the precision casting forming supplemented by machining can be obtained after the surface clean no shrinkage holes, internal organisation intact without defects, mechanical properties of the shell components, greatly reducing the difficulty and cost of machining. Now has built a 150 kg condensing shell furnace casting equipment of titanium composite materials precision casting production line, can achieve the maximum outer diameter of 1 200 mm, height 500 mm titanium composite material components casting, the maximum quality of a single piece of up to 100 kg. 5vol% (TiB + TiC)/TC4 composite castings, room temperature strength and elongation of 1 030 MPa. 2.5%, compared with the as-cast casting, the room temperature strength of 1 030 MPa. 2.5%, compared with the as-cast casting, 2.5% respectively for 5 vol% (TiB +TiC)/TC4 composite castings, which is a significant increase compared to the as-cast matrix alloy.