High strength and high impact toughness corrosion resistant weldable titanium alloy, related to the technical field of titanium alloy, according to the mass percentage, its classification into: Al: 4.0~8.0wt.%, Mo: 0.3~6.0wt.%, V: 0.3~6.0wt.%, Nb: 0.3~5.0wt.%, Cr: 0.3~6.0wt.%, Zr: 0.3~5.0wt.%, and the aluminum equivalent [Al] is ≥6, the molybdenum equivalent [Mo] is ≤8.0, the margin is Ti, and the interstitial elements and unavoidable impurity elements, the interstitial elements are C, H, O and N, and the total mass percentage of all elements in titanium alloy is 100%. The titanium alloy material of the invention has the comprehensive performance of high strength, high impact toughness, corrosion resistance and weldability, and has good cold and hot processing performance, and can be formed into forgings and thick plates, etc.
The development of the Marine industry and the navy, the continuous update of Marine engineering components and ship equipment, put forward higher requirements for the strength, plasticity and toughness of titanium alloy materials, such as oil well pipe, deep submersible and other underwater pressure components require titanium alloy to have high strength and impact toughness. At present, high-strength titanium alloys are mainly α+β type, near metastable β type and metastable β type titanium alloys, generally through forging to obtain fine grain structure, and then through further solid solution strengthening and aging and other heat treatment processes to change the shape, type, size and volume fraction of the α phase in the structure to improve the strength. The main representative high-strength titanium alloys at home and abroad are Ti62222S(Ti-6Al-2Mo-2Zr-2Sn-2Cr-1.5Si), BT22 titanium alloy, Ti-10V-2Fe-3Al(Ti 10-2-3), TC21(Ti-6Al-2Mo-1.5Cr-2Zr-2Sn-2Nb) and Ti-β21S, etc. These alloys have high strength, good plasticity and fracture toughness, but low impact toughness, which can not meet the special use conditions of the Marine environment, such as the important reason for some ship accidents is due to the brittleness of the material. In addition, large titanium alloy structural parts for Marine and ocean engineering need to be welded, and the existing high-strength titanium alloy has poor welding performance, especially the impact toughness of the heat affected zone after welding is low. Therefore, the development of a new type of corrosion-resistant weldable titanium alloy with high strength and high impact toughness has become an urgent technical problem for Marine environment..
The purpose is to provide a high strength and high impact toughness corrosion-resistant weldable titanium alloy, and the alloy has good cold and hot processing properties, can be formed into forgings and thick plates.
