High strength titanium and titanium alloys
High strength titanium and titanium alloy refers to the titanium alloy with tensile strength between 1100 and 1400MPa at room temperature, which is composed of nearly β titanium alloy and metastable β titanium alloy. The first industrial application is Ti13V11Cr3Al metastable β titanium alloy, whose room temperature tensile strength reaches 1350MPa. Later, the sheet titanium alloy Ti15V3Cr3A13Sn, which can be cold formed, and Ti8V6Cr4Mo3A14Zr, which is used for springs and fasteners, are developed. Ti-10V-2Fe-3Al nearly β type high strength titanium alloy is developed to meet the needs of damage tolerance design principle, which has high structural benefits, high reliability and low manufacturing cost. Three kinds of tensile strength and fracture toughness can be achieved by different solution aging treatments. It also has excellent forging process performance and can be isothermal or hot die forged at 760-800 degrees Celsius to produce precision or semi-precision die forgings. It can work below 320 degrees Celsius for a long time, and has been widely used in the manufacture of aircraft landing gear, fuselage, wings of various important mechanical structures.