A kind of short process preparation method and application of tc4 titanium alloy plate

Abstract

The invention discloses a short-process preparation method of TC4 titanium alloy plate. The steps are as follows: EB slab preparation, welding cladding, selecting the target thickness of rolling for 1 to 3 fires according to the thickness of the finished plate, and the welding cladding is specifically on the slab A layer of pure titanium cladding plates are welded on the upper and lower surfaces, and the cladding plates are respectively welded on the upper and lower surfaces of the slab by an automatic spot welding machine, and the edge sealing is welded by manual argon arc welding and welding wire; When it is a semi-finished billet, firstly carry out the surface treatment on it before rolling it next time. When selecting the finished sheet rolled by 1st heat, 2nd heat or 3rd heat, first heat, 2nd heat or 3rd heat Atmospheric annealing is carried out on the three-fire rolled plate, the annealing temperature is 700~870°C, the holding time is ≥30min, and the surface treatment is carried out after annealing. The invention improves the welding seam strength, rolling temperature, and rolling heat deformation rate, The production process is shortened, the production cost is reduced, the material yield is increased, and a TC4 titanium alloy plate with good structure and performance is prepared.

Description

technical field [0001] The invention relates to the technical field of preparation of titanium alloy plates, in particular to a short-process preparation method and application of TC4 titanium alloy plates. Background technique [0002] TC4 titanium alloy has high specific strength, good processing performance, mature industrial manufacturing and engineering applications, and is widely used in chemical, aerospace, shipbuilding, sports, medical and other fields. It is the most widely used titanium alloy brand in the world, accounting for the titanium alloy market. more than 50% of. At present, domestic industrial production mainly uses vacuum consumable electric arc furnaces to prepare titanium alloy ingots for 2~3 times, and then forges and grinds for multiple times to obtain rolling slabs, which has the disadvantages of long production process and large material loss. Due to the high production cost, its further application in chemical industry, armor, sports and leisure, ...

AI Technical Summary

Problems solved by technology

[0004] In addition, in the preparation of TC4 alloy plates in the prior art, the anti-oxidation protective coating is coated on the surface of the slab before the first-fire rolling, and the coloring flaw detection is carried out in the middle fire, and the mechanical properties meet the requirements of the relevant standards through at least three-fire rolling. However, during the preparation process, the first-fire blanking temperature of 1000~1100°C exceeds the phase transition point, and it is impossible to prepare a plate with good structure and performance through first-fire rolling, and the structure of EB slab is coarse, and there are cracks on the surface of the first-fire rolling The control is difficult, and the anti-oxidation coating cannot effectively solve the surface cracks of the first-fire billet, resulting in deeper surface cracks after the first-fire rolling, increased grinding amount, and more invisible material loss. It is impossible to carry out large-deformation rolling below the phase transition point. The microstructure and mechanical properties of the first-fire plate cannot be effectively controlled; in addition, there are many rolling fires, the production process is long, and the rolling temperature and rolling heat deformation rate need to be further optimized;

[0005] Moreover, in some existing technologies, when preparing titanium alloy plates, the cladding plates are respectively spot-welded on the surface of the substrate, and the edges of the cladding plates and the substrate are seam-welded, although the surface cracks and cracks can be effectively reduced during rolling, and the amount of surface grinding can be reduced. , but there are problems such as low welding cladding efficiency, high requirements for the working environment, and high dependence of welding quality on personnel technology, which cannot meet the requirements of mass production. When automatic welding technology is used, it overcomes the manual welding efficiency of thin metal plates and thick plates. Low cost, high cost and unstable quality, but the automatic seam welding of the edge does not add welding wire. When it is relatively large, the heating time of the first-fire billet is long and the heating temperature is high. The upper and lower surface of the slab and the welding seam of the edge of the slab absorb air during the heating process, and the slab will be partially separated from the slab, and the lower surface will be subject to friction. Larger, the cladding plate is easier to separate from the slab, resulting in partial or large-area shedding of the cladding plate during the rolling process, damage to the roll, deeper rolling cracks on the surface, poor cladding effect, and easy rolling on the surface of the plate. pressure pit

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