Titanium alloy for arc/electron beam fuse additive manufacturing and preparation method thereof

Abstract

The invention belongs to the technical field of titanium alloy materials, and particularly relates to a titanium alloy for additive manufacturing of electric arc / electron beam fuses and a preparationmethod of the titanium alloy. The titanium alloy is prepared from the following components in percentage by weight: 6.0 to 7.2 percent of aluminum, 3.8 to 5.0 percent of vanadium, 0.5 to 2.5 percent of zirconium, 0.08 to 0.11 percent of oxygen and the balance of titanium and impurities, wherein the impurities comprise the following components in percentage by weight: smaller than or equal to 0.25percent of iron, smaller than or equal to 0.08 percent of carbon, smaller than or equal to 0.03 percent of nitrogen and smaller than or equal to 0.012 percent of hydrogen. Aiming at the technologicalcharacteristics for an additive manufacturing technology of the electric arc / electron beam fuses, the titanium alloy suitable for the additive manufacturing technology of the electric arc / electron beam fuses is obtained by making full use of the strengthening and toughening mechanisms of aluminum, vanadium, zirconium and oxygen alloying elements on an additive manufacturing titanium alloy member,the additive manufacturing titanium alloy member prepared by adopting titanium alloy wires has good strength, plasticity, toughness and fatigue performance.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy materials, and in particular relates to a titanium alloy for arc / electron beam fuse additive manufacturing and a preparation method thereof. Background technique [0002] Due to its low density, high specific strength, high temperature resistance, oxidation resistance, and corrosion resistance, titanium alloys have become key structural materials for advanced aircraft and aero-engines. In order to meet the needs of durability / damage tolerance design, a large number of key components of domestic and foreign aircraft use damage-tolerant titanium alloys with high fracture toughness, high crack growth threshold, and low crack growth rate, such as the American F-22 aircraft. The main load-bearing bulkheads of the middle and rear fuselage, the fuselage wing connection long beam and other large and complex overall key components are made of β-annealed damage-tolerant Ti-6Al-4V ELI titanium alloy, ...

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Problems solved by technology

At present, most of the titanium alloy wires for arc / electron beam fuse additive manufacturing are made of traditional forged or cast titanium alloys. The applicant found in the research that the wires made of forged or cast titanium alloys with the same composition, Under the conditions of arc / electron beam fuse additive manufacturing process, there will be obvious burning loss of alloy elements, which will make the element content exceed the lower limit range specified in the standard, resulting in the reduction of the mechanical properties of the workpiece, especially the strength and toughness; in order to obtain the desired Strength level, the oxygen element content of the existing titanium alloy wire for additive manufacturing is generally controlled above 0.12%. Although a sufficient level of strength has been obtained, the plasticity, toughness, and fatigue properties are reduced, and the comprehensive performance matching is difficult to reach the expected level; in addition , the titanium alloy wire prepared by the existing technology has problems such as low dimensional accuracy, uneven shape control, low production efficiency and yield, which lead to wire clamping, broken wire, and poor wire feeding in the actual application process. and other phenomena seriously affect the control requirements of arc / electron beam fuse additive manufacturing technology on production efficiency, dimensional accuracy and internal quality

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