Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium rod
Ti-6.5Al-3.5Mo-1.5Zr-0.3Sititanium-rod.html> titanium rod
Ti-6.5Al-3.5Mo-1.5Zr-0.3Si is an α-β type titanium alloy heat-resistant titanium alloy with an aluminum equivalent of 3.5 and a molybdenum equivalent of 7.3. The alloy also has good thermal processability (including conventional process performance and superplasticity), and can be welded and machined in various ways. The β heat treatment and isothermal forging of the alloy have been developed rapidly. The alloy also has a certain sensitivity to hot salt stress corrosion. The alloy is mainly used in the manufacture of compressor discs, blades, drums and other parts of aero-engines, and can also be used in the manufacture of aircraft structural parts. Through thermal deformation and heat treatment in the α-β region, the maximum long-term working temperature of the alloy is 500°C. The semi-finished products produced include bars, forgings and die forgings.
Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium alloy is a high-temperature titanium alloy widely used in China's airspace, with a maximum service temperature of 500°C. Drums and shafts, etc. It can also be made into special-shaped castings. The working conditions of the parts are: in the annealed state, it can be used for 500 hours below 500°C, 100 hours below 550°C and 1000 hours below 450°C, and can be used for 100 hours below 500°C in the strengthened state. Parts and parts that work at one time below 700°C.
The alloy is mainly used in the manufacture of compressor discs, blades, drums and other parts of aero-engines, and can also be used in the manufacture of aircraft structural parts. Through thermal deformation in α+β zone and heat treatment in α+β zone, the maximum long-term working temperature of TC11 alloy obtained is 500℃. The semi-finished products produced include bars, forgings, die forgings and castings.
Ti-6.5Al-3.5Mo-1.5Zr-0.3Si heat treatment system
(1) Double annealing: 950°C, 1-2h, air cooling + 530°C, 6h, air cooling. The first annealing temperature is allowed to be properly adjusted in the range of 30-50°C below the β transformation point. The holding time for the first annealing is determined according to the maximum section thickness: 1h for below 25mm; 1.5h for 26-50mm; 2h for 51-75mm.
(2) Stress relief annealing: 530-580°C, 0.5-6h, air cooling or furnace cooling.
Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Melting and Casting Process
The alloy should be smelted in a vacuum consumable electrode electric arc furnace for more than two times.
Application overview and special requirements of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si
The alloy has been used to manufacture turbojet engine compressor discs, blades and other aviation parts. Due to thermal stability and creep limitations, the alloy allows a working time of 6000h at 450°C and 500h at 500°C.
Welding performance of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si
(1) The alloy can be applied to welded structures. Inert gas (argon, helium) or vacuum method must be used for protection during fusion welding. Welds should have no oxidation color or light yellow.
(2) Due to the large response of the alloy to the thermal cycle of welding, some special heat treatment is required, not only to eliminate residual stress, but also mainly to stabilize the microstructure and properties of the weld and the metal in the vicinity of the weld. Annealing after welding and air cooling or furnace cooling is generally recommended. Annealing is carried out in a vacuum furnace or an inert gas container, and flame spray guns are not allowed for annealing.
Heat Treatment Process of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Parts
In the double annealing process of actual parts (especially forgings with large cross-sections), attention should be paid to the air-cooling conditions for the first annealing, and stack cooling or air cooling on the bottom of the bottom furnace is not allowed, so as not to affect the microstructure and properties due to the slow cooling rate (especially reduce the tensile strength).
Exported Ti-6.5Al-3.5Mo-1.5Zr-0.3Si titanium rod to Russia