The improvement of aero-engine performance is inseparable from the synergistic application of new high-temperature titanium alloys and advanced structural design. China has accelerated the research process of new high-temperature titanium alloy materials since the 1990s, and carried out the research and development of new materials such as high-temperature titanium alloys at 550 ℃, high-temperature titanium alloys at 600 ℃, flame-retardant titanium alloys, and intermetallic alloys of the Ti-Al system. In terms of high temperature titanium alloys, the first generation of domestic independent research and development of rare earth Nd-containing 550 ℃ high temperature titanium alloys (TA12) and 600 ℃ high temperature titanium alloys (Ti60) has excellent thermal strength properties, but due to the lack of reserves of research on welding technology, as well as rare earth phases are easy to weld the region of the grain boundaries of polymerisation easily caused by the joints of brittle fracture and so on the problem has not been effectively resolved, not in the aero-engine on the practical application. Practical application.
Based on the electron concentration theory, the second generation of 550 ℃ high temperature titanium alloys (TA32) and 600 ℃ high temperature titanium alloys (TA32), which have good heat strength properties, good forging and processing, and good welding properties, have been developed by adding the elements of Nb and Ta based on the Ti-Al-Sn-Zr-Mo-Si alloy system with appropriate use of the α2-phase reinforcement and the precipitation phase of the silicides, which further improves the effect of multi-element composite solid solution reinforcement. The compositional differences between TA29 and TA33 titanium alloys are relatively small, and the differences in performance levels depend mainly on process control factors.
On the basis of the second-generation 600 ℃ high-temperature titanium alloys, 650 ℃ high-temperature titanium alloys (Ti65) have been further developed by adding W elements and increasing the content of Ta elements, so that the long-term operating temperature of solid solution strengthened high-temperature titanium alloys is expected to break through the traditional 600 ℃ 'thermal barrier' temperature. In the research of flame-retardant titanium alloys, two Ti-V-Cr flame-retardant titanium alloys have been researched and developed, namely, TB12 flame-retardant titanium alloy (Ti40) for long-term use at 500 ℃ and TF550 flame-retardant titanium alloy for long-term use at 550 ℃. The study of the flame retardant properties and comprehensive mechanical properties of TB12 and TF550 titanium alloys shows that these two alloys have similar flame retardant properties, and the difference in the V element content mainly affects the heat-strength properties of the materials. In the research of Ti-Al intermetallic alloys, the research of (α2 + O + B2) three-phase Ti3Al alloys, O-phase based Ti2AlNb alloys and γ-TiAl alloys has been carried out comprehensively, and the long-time service temperature of Ti-Al intermetallic alloys reaches 650-800 ℃.
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