Preparation method of TC6 titanium alloy large-sized bar

Abstract

The invention discloses a preparation method of a TC6 titanium alloy large-sized bar. The preparation method comprises the following steps: I, a titanium alloy cast ingot is subjected to square-drawing cogging forging; II, slitting and blanking are conducted, and then first-time drawing-out rolling forging is conducted; III, slitting and blanking are carried out, and then second-time drawing-out rolling forging is carried out; and IV, solid solution heat treatment and aging heat treatment are conducted to obtain the TC6 titanium alloy large-sized bar with a cross section diameter of 100 mm-210 mm and a length of 2000 mm-4000 mm. According to the preparation method, thick as-cast structures in cast ingots are broken through one-heating-number square-drawing cogging forging, so that the heating number of forging is reduced; by carrying out one-heating-number drawing-out rolling forging above phase transformation temperature and two to three-heating-number drawing-out rolling forging below the phase transformation temperature, long-strip structures are effectively broken, the structures are further refined, the defects of low efficiency and long process in processing and preparation of a conventional large-sized titanium alloy are overcome, and the forging heating number during large-sized titanium alloy machining is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy material processing, and in particular relates to a method for preparing large-scale rods of TC6 titanium alloy. Background technique [0002] TC6 titanium alloy is a martensitic α-β two-phase titanium alloy with good comprehensive properties. Its nominal composition is Ti-6Al-2.5Mo-1.5Cr-0.5Fe-0.3Si. β-stable elements Mo and eutectoid β-stable elements Cr, Fe and Si. TC6 titanium alloy has high room temperature strength and good thermal strength below 450°C. The alloy also has excellent thermal processing performance, low deformation resistance and high plasticity. TC6 alloy is mainly used to manufacture parts such as compressor discs and blades of aero-engines. The alloy can also be used as a medium-strength alloy to manufacture aircraft frames, joints and other load-bearing structural parts and fasteners for different purposes. The semi-finished products produced mainly include bars, ...

AI Technical Summary

Problems solved by technology

In this method, the TC6 titanium alloy ingot is subjected to one-fire drawing square billet forging, which breaks the coarse as-cast structure in the TC6 titanium alloy ingot, reduces the number of fires for subsequent forging of the TC6 titanium alloy ingot, and passes through phase transformation. Above the temperature, the first-fire long-drawing and spheroidal forging is carried out, and the second-to-third-fire long-drawing and spheroidal forging is carried out under the phase transition temperature, which effectively breaks the long strip structure and further refines the structure. The cross-sectional diameter is 100mm ~ 210mm. The TC6 titanium alloy large-size bar with a length of 2000mm-4000mm solves the shortcomings of low efficiency and long process of conventional large-size titanium alloy processing and preparation, and effectively reduces the number of forging fires when processing large-size titanium alloys.

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