A kind of titanium alloy and its application in processing train connecting parts

Abstract

The titanium alloy disclosed by the invention comprises the following components by weight percentage: 3.8-4.8% of Al, 2.0-3.2% of V, 0.7-1.7% of Fe, 0.2-0.3% of O, and the balance is Ti. The processing steps are as follows: Step 1) The titanium alloy ingot is heated in the temperature range of 100-150°C above the phase transition point, and the final forging temperature is 900°C±20°C, and the billet forging is carried out, and the reduction is 10-25mm each time. Between; Step 2) Heating within the temperature range of the phase transition point ± 20°C, performing upsetting and drawing forging, the final forging temperature is 850°C ± 20°C, and the reduction does not exceed 30% of the length; Step 3) In the phase Heat at 30-50°C below the change point, and then forge the finished product. The deformation is controlled at about 60%, and the finished product is heat-treated after forging. Step 4) The heat treatment system is vacuum annealing, the annealing temperature is about 150° C. within the phase transition point, heat preservation for 60-90 minutes, and air cooling. Manufacture transmission pins, connecting rods, motor suspenders, tie rod bodies and fasteners of train or motor car bogies. The invention has the effects of weight reduction and corrosion resistance.

Description

technical field [0001] The invention belongs to the device used for fastening or fixing components or machine parts, such as connectors or the technical field of connections, and in particular relates to titanium alloy connectors for trains. Background technique [0002] The content of titanium in the earth's crust is 0.63%, ranking ninth among various elements on the earth, ranking seventh in terms of metal elements, and ranking fourth in terms of technical structural materials, second only to aluminum, iron, and magnesium. [0003] The density of titanium and its alloys is 4.5g / cm 3 About 57% of steel. It has high specific strength, good corrosion resistance and bonding performance, good high-temperature mechanical properties, fatigue and creep properties, and excellent comprehensive properties. It is a new type of structural material with great development potential and application prospects. [0004] At present, titanium and its alloys are mainly used in aerospace and ...

AI Technical Summary

Problems solved by technology

In coastal areas, due to the influence of seawater, the content of chloride ions in the air increases, which also accelerates the corrosion of steel parts.

Due to the poor corrosion resistance of steel and the harsh working environment of trains, the maintenance cost of each component is relatively high

[0007] Moreover, all steel parts in trains need heat treatment, and the heat treatment process of the same steel is more complicated due to its different requirements and working environment.

increased worker workload

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