Alpha and beta combined titanium alloy wire for electron beam fused deposition rapid formed structural member with strength level of 920 MPa

Abstract

The invention discloses an alpha and beta combined titanium alloy wire for an electron beam fused deposition rapid formed structural member with the strength level of 920 MPa. The alpha and beta combined titanium alloy wire is characterized in that an alpha phase is strengthened by an alloy element Al and an interstitial element O, and a beta phase is strengthened by an alloy element V and Fe, wherein the wire comprises the following components of: 6.2 to 7.5 weight percent of Al, 4.0 to 5.5 weight percent of V, 0.10 to 0.50 weight percent of Fe, 0.12 to 0.25 weight percent of O, the balance of Ti and inevitable impurity elements. The invention also provides the corresponding melting process, a thermal machining process and a thermal treatment process for the electron beam fused deposition rapid formed structural member. By the alloy wire, a requirement on the process for quickly forming by stacking the fuse wires of the electronic beams is met, and the titanium alloy structural member has relatively high mechanical performance. Great social benefits and economic benefits are created after the alloy wire is popularized and applied.

Description

Technical field: [0001] The invention belongs to the technical field of titanium-based alloys, and in particular relates to a titanium alloy wire material specially used for making 920MPa intensity level electron beam fuse accumulation rapid forming components. Background technique [0002] In order to reduce the weight of the aircraft structure, the use of high specific strength titanium alloy material is an ideal choice. The large and complex titanium alloy structure used for aircraft bears relatively large loads, which requires high material properties, especially strength. There are two typical preparation methods for traditional large and complex titanium alloy structures, forging and casting. Compared with castings, forging parts (forgings) have obvious advantages in comprehensive mechanical properties, especially strength and plasticity, but there are long thermal processing cycles and material utilization (only 3%~5%) are extremely low, high cost, and difficult to g...

AI Technical Summary

Problems solved by technology

There are two typical preparation methods for traditional large and complex titanium alloy structures, forging and casting. Compared with castings, forging parts (forgings) have obvious advantages in comprehensive mechanical properties, especially strength and plasticity, but there are long thermal processing cycles and material utilization (only 3%~5%) are extremely low, high cost, and difficult to guarantee performance uniformity when the blank size is large; the advantage of castings is that the material utilization rate is higher than that of forgings, but there are obviously low mechanical properties such as strength and plasticity, casting defects and Due to the difficulty in controlling the uniformity of the microstructure and mechanical properties caused by the size effect of the components, most of the key load-bearing structures cannot be cast, and the application range is greatly limited.

Both forging and casting methods require tooling and molds, which have strict requirements on equipment and site, which prolongs the delivery cycle and increases the cost

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