Method for controlling homogeneity of structure properties of high-strength and high-plasticity TB6 titanium alloy wires

Abstract

The invention belongs to the technical field of preparation of titanium alloy wires, and particularly relates to a method for controlling homogeneity of structure properties of high-strength and high-plasticity TB6 titanium alloy wires. The method comprises the following steps: carrying out multi-pass large deformation hot rolling on a TB6 titanium alloy bar with the specification of phi 40mm- phi45mm* 800mm-1200mm at first to obtain a bar with the specification of phi 9 mm-phi 10 mm; then carrying out single-phase region solid-solution treatment and then carrying out cold rolling, and controlling total deformation of cold rolling to be 15-36% to obtain a wire with the specification of phi 6 mm-phi 7 mm; and finally, carrying out ageing treatment on the wire at the temperature of 520-560 DEG C. The method is simple in process parameter setting, convenient to operate and high in process controllability, and the tensile strength sigma b of the wire in an aged state at the room temperature is greater than or equal to 1050 MPa, the yield strength sigma 0.2 is greater than or equal to 1000 MPa, the elongation delta 5 is greater than or equal to 15%, the percentage reduction of area psiis greater than or equal to 50%, the batch stability is high, and the repeatability is good.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy wire preparation, and in particular relates to a method for controlling the uniformity of structure and performance of high-strength and high-plasticity TB6 titanium alloy wire. Background technique [0002] At present, high-strength titanium alloys have become one of the main development directions of titanium alloys. As a structural material, this type of alloy is widely used in the manufacture of aircraft and helicopters. High-strength titanium alloys are generally heat-treated titanium alloys with a strength of more than 1000 MPa, generally including α+β two-phase titanium alloys and β-type titanium alloys, of which β-type titanium alloys not only have good cold and hot processing properties, but are easy to forge and can be rolled. , welding, and many advantages such as high mechanical properties and good strength and fracture toughness matching can be obtained through the subsequent s...

AI Technical Summary

Problems solved by technology

The quenched ω phase has high strength and low plasticity, and belongs to the hard and brittle phase. Although the fine and dispersed ω phase can strengthen the matrix, the appearance of the ω phase will easily lead to a sharp decrease in the plasticity of the alloy. When the content of the ω phase in the alloy reaches 5 % above the plasticity of the alloy can almost drop to zero

Therefore, due to the phase change characteristics of TB6 titanium alloy itself, the wire is usually prepared by multi-pass hot rolling or cold rolling after multi-pass annealing. The centerless lathe removes the surface scale, and the heat treatment before each cold rolling in the multi-pass cold rolling is cumbersome and the efficiency is not high.

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