| Ti-1300 titanium alloy is a new near β titanium alloy independently developed by our country. Ti-1300 alloy has good ductility and high hardenability, matching the good plasticity and toughness in the 1300 MPa intensity level and can be applied to high strength aerospace structure. Ti-1300 alloy performance depends largely on its phase composition and morphology, and the phase transition behavior of the alloy, such as heat treatment process has a significant impact. But as a new kind of alloy, the current related research is few.In this paper, the law of microstructure transition of Ti-1300 alloy during continuous cooling, solution treatment and ageing has been investigated with heat treatment furnace, rapid phase change device, dilatometer, OM, TEM, XRD and micro hardness testing and other methods. The results show that the microstructure of Ti-1300 alloy show regular variation with the increase of cooling rate, the aging time, the aging temperature and the solid solution. When the cooling velocity is lower, microstructure obtained is lamellar α phase and β phase in the room temperature. When the cooling speed is faster than 0.3 degrees Celsius per second, residual β phase appears in the lamellar microstructure and increased with the cooling rate increasing. When the aging time is longer, α phase increase and β phase decrease. When the aging temperature is higher, the size of α phase increased. Microhardness of alloy increased first and then decreased with the cooling rate increasing, the aging temperature increasing and the aging time increasing.
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