Close to β titanium alloy processing, and can be used to manufacture structural parts and components in aerospace engineering. Ingot titanium alloys containing titanium, vanadium, molybdenum, chromium, iron, zirconium, oxygen and nitrogen were manufactured from the deformed products manufactured from near β titanium alloys. The ingot is thermally machined by repeated heating, deformation and cooling. High precision stamping products with a thickness of more than 100mm in cross section and a length of more than 6m are produced, which have stable high ultimate tensile strength values and fracture toughness values.
The high specific strength of near β titanium alloys is very favorable for their application in fuselage structures. The main obstacles to building a competitive airliner lie in structural fabrication and material selection, as well as a good balance of performance and weight. The current trend towards increasing the size and weight of commercial aircraft has dictated the need for these alloys, which in turn has resulted in the increased cross-section of high-load components such as landing gear and fuselage components with the desired uniform level of mechanical properties. In addition, the requirements for materials have become significantly more stringent, with a good balance of high strength and high fracture toughness becoming a requirement. The structure is made of high alloy steel or titanium alloy. Replacing alloy steel with titanium is potentially very beneficial, as it promotes at least 1.5 times weight loss, improved corrosion resistance and reduced maintenance. These titanium alloy presents a solution to the problem, and can be used in the manufacture of a wide range of important products, including large die forgings and section size of more than 150 ~ 200 mm forgings, and has a small section of the semi-finished products, such as bar, plate thickness up to 75 _, small cross section described semi-finished products widely used in the manufacture of different aircraft components, including fasteners. Although compared with steel strength of the titanium alloy with good behavior, but their application is limited by processing ability, which is limited by such as under: as compared with the high alloy steel is relatively low thermal processing temperature, relatively large strain during hot working, low thermal conductivity and difficult to achieve uniform structure and mechanical properties of the especially for thick section parts. Therefore, separate processing methods are required to obtain the specified metal.
Compared with other titanium alloys such as Ti-10V-2Fe-3Al, the near β titanium alloy Ti-5Al-5Mo-5V-3Cr-Zr is characterized by some advantages. They are less susceptible to segregation, exhibit strength behavior up to 10% higher than that of Ti-10V-2Fe-3Al alloys, and have improved hardenability, which enables the production of forgings with uniform structure and properties with cross sectional sizes in excess of 200mm(almost twice as high). They are also characterized by improved machinability. In addition, the alloy exhibits fracture toughness comparable to that of Ti-6Al-4V alloy with strength exceeding 100MPa, which is 150-200 MPa higher than that of Ti-6Al-4V alloy at this strength.
