A kind of manufacturing method of high-quality titanium alloy

Abstract

The invention belongs to the technical field of rare metal machining, and particularly relates to a manufacturing method for a high-quality titanium alloy (BT6C). Aluminum is added in the form of a titanium-alloy intermediate alloy and a vanadium-aluminum intermediate alloy, the titanium-aluminum intermediate alloy is prepared, an adding method for microelement zirconium is implemented, an adding method for microelements for refining grains is implemented, the melting technology is controlled, microelements improving the cold and heat machining performance and the microelements for refining the grains are added, the component structure of the high-quality titanium alloy (BT6C) is improved, and the mechanical performance of the high-quality titanium alloy (BT6C) is improved.

Description

technical field [0001] The invention belongs to the technical field of rare metal processing, and in particular relates to a method for manufacturing a high-quality titanium alloy. Background technique [0002] Titanium and titanium alloys are divided into α, near α, α+β, near β, and β type titanium alloys according to the organization. ВТ6С is the Russian (former Soviet) brand, the Chinese brand is TC4ELI, and the American brand is Gr.5; the main component is Ti -6Al-4V, the structure is α+β two-phase titanium alloy; this type of alloy was developed in the 1950s, and it is widely used due to its excellent comprehensive mechanical properties. The amount of this type of alloy used in the world accounts for about 80% of the amount of titanium alloy used %; Mainly used in aerospace, offshore oil and gas fields and other structural parts and titanium alloy stress parts, this type of titanium alloy is also widely used as human implant materials. [0003] This type of alloy is a ...

AI Technical Summary

Problems solved by technology

The main problems are: the aluminum content is unstable; trace elements, especially elements that can refine grains, are not added or there is no way to add them; the control range of O, N, C, and Fe impurities is incorrect; the traditional titanium alloy production units in China The production process is: sponge titanium + vanadium-aluminum master alloy + pure aluminum beans or aluminum foil to supplement aluminum, large mixture or package of intermediate alloy package - extrusion electrode block - welding consumable electrode - secondary or tertiary vacuum Self-consumption smelting——titanium ingot casting; among them, the addition and control of aluminum is in the form of vanadium-aluminum master alloy and pure aluminum; O, N, C, Fe are based on the content of sponge titanium and vanadium-aluminum master alloy, considering smelting There is basically no addition of trace elements to refine the grains; the main problem is: in the smelting of pure aluminum, due to its low melting point, there is burning loss and volatilization during the smelting process, and the loss of different smelting process parameters before, middle and later stages of smelting The degree is different, so the aluminum content is uneven in the upper, middle and lower parts of the ingot. Aluminum is an α-phase stable element and is very sensitive to strengthening titanium alloys. Although the aluminum content is within the standard range, there is no consistency in structure and performance.