Titanium alloy and application of titanium alloy to machining of train connecting piece

Abstract

The invention discloses a titanium alloy. The titanium alloy 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 of Ti. Machining steps are as follows: step (1), heating a titanium alloy ingot in a temperature range of 100-150 DEG C above a phase transformation point, controlling the final forging temperature in a range of 900 DEG C + / -20 DEG C, performing cogging forging, and controlling rolling reduction at every time within 10-25 mm; step (2), heating in a temperature range of the phase transformation point + / - 20 DEG C, performing upsetting and drawing forging, and controlling the final forging temperature in a range of 850 DEG C + / -20 DEG C and the rolling reduction not to excess 30%of the length; step (3), heating at 30-50 DEG C below the phase transformation point, performing finished-product forging, controlling deformation to be about 60%, and performing heat treatment after the finished-product forging; step (4), performing vacuum annealing as the heat treatment, controlling the annealing temperature to be in a range of about 150 DEG C within the phase transformation point, controlling the temperature changeless to be 60-90 min, and performing air cooling. The titanium alloy is applied to manufacturing of a drive pin, a connecting rod, a motor suspending lever and a fastening of a train or a motor car; weight losing and corrosion resisting effects are achieved.

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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