CN104294107A

CN104294107A - Composition for preventing aluminum alloy from causing large crystal grains

Info

Publication number: CN104294107A
Application number: CN201410591329.XA
Authority: CN
Inventors: 张超
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-10-29
Filing date: 2014-10-29
Publication date: 2015-01-21

Abstract

The invention relates to a composition for preventing aluminum alloy from causing large crystal grains. The composition for preventing the aluminum alloy from causing large crystal grains comprises the following components by weight percentage: 0.58-0.61% of magnesium, 0.03-0.035% of carbon, 0.75-0.78% of silicon, 0.30-0.35% of manganese, 0.1-0.15% of chromium, 0.2-0.24% of copper, 0.2-0.4% of iron, 0.03-0.05% of titanium, 0.001-0.0015% of vanadium, 0.01-0.03% of strontium, 0.001-0.003% of scandium, 0.001-0.003% of neodymium, 0.03-0.05% of molybdenum and the balance of aluminum. According to the invention, small crystal grains in the interior of aluminum alloy organization and the resistance to the growth of crystal grain can be better realized; moreover, the preparation technology for the composition for preventing the aluminum alloy from causing large crystal grains ensures uniform organization structure.

Description

A kind of composition preventing aluminium alloy from occurring large grain size

Technical field

The invention belongs to aluminium alloy preparation field, refer to a kind of composition preventing aluminium alloy from occurring large grain size especially.

Background technology

Because aluminium alloy have lightweight, intensity is high and corrosion resistant advantage, has been widely used in the fields such as Rail car manufacture, machinery and building.In order to alleviate the weight of the finished product, the aluminium profile material now used is thin-walled, the beginning such as hollow, and for the aluminium alloy used as sheet material, existing production method is mainly manufactured by techniques such as extruding, but in extrusion process, the deflection of aluminum alloy blank, stress and heat up large, thus crystal grain can occur in quenching process regrow problem, and grain growing is too fast and form uneven coarse grain.Such aluminum alloy organization's structure, all has a great impact the mechanical property of the finished product, anti-fatigue performance and face corrosive nature.

Aluminium alloy how can be suppressed to be processed into the crystal grain regrowth in section bar process, and improving small grains in in-house ratio, to ensure aluminum alloy organization's consistent internal structure, is one of major subjects of those skilled in the art.

Summary of the invention

The object of this invention is to provide a kind of composition preventing aluminium alloy from occurring large grain size, by the technical program, the crystal grain of aluminium alloy can be made tiny and homogeneous microstructure, improve the performance of product.

The present invention is achieved by the following technical solutions:

A kind of composition preventing aluminium alloy from occurring large grain size, its composition is by weight percentage, the aluminium of the scandium of the vanadium of the iron of the chromium of the silicon of the magnesium of 0.58-0.61%, the carbon of 0.03-0.035%, 0.75-0.78%, the manganese of 0.30-0.35%, 0.1-0.15%, the copper of 0.2-0.24%, 0.2-0.4%, the titanium of 0.03-0.05%, 0.001-0.0015%, the strontium of 0.01-0.03%, 0.001-0.003%, the neodymium of 0.001-0.003%, the molybdenum of 0.03-0.05% and surplus.

The present invention's beneficial effect is compared with the existing technology:

By adding titanium and v element in the technical program, the crystal grain of aluminum alloy organization inside better can be realized tiny and resist the growth of crystal grain; And by preparation technology, ensure that the even of weave construction.

Embodiment

Describe technical scheme of the present invention in detail below by way of specific embodiment, should be understood that, it is limitation of the present invention that following specific embodiment only can be used for explaining the present invention and can not being used for explanation.

Add carbon in the inventive solutions and better can promote ferro element fusing at aluminium alloy, improve dense structure's property, prevent excessive grain growth.

Described preparation method is:

Batching, its composition is by weight percentage, and the aluminium of the scandium of the vanadium of the iron of the chromium of the silicon of the magnesium of 0.58-0.61%, the carbon of 0.03-0.035%, 0.75-0.78%, the manganese of 0.30-0.35%, 0.1-0.15%, the copper of 0.2-0.24%, 0.2-0.4%, the titanium of 0.03-0.05%, 0.001-0.0015%, the strontium of 0.01-0.03%, 0.001-0.003%, the neodymium of 0.001-0.003%, the molybdenum of 0.03-0.05% and surplus carries out calculating batching;

Melting, above-mentioned batching is carried out being smelted into liquid and breeding 0.5-1 hour, then liquid is lowered the temperature to be warming up to again after 120-150 DEG C and breed temperature, be incubated and carry out constant temperature casting after 0.5-1 hour, in temperature-fall period, adopt cooling rate to maintain 15-20 DEG C/min at the uniform velocity lower the temperature into aluminum alloy ingot;

Quenching, carries out constant temperature extruding in 1-2 hour by aluminum alloy ingot at the quenching furnance inside holding of 520 ± 20 DEG C, and extrusion speed at 1.5-2.5 m/min, and adopts water liquid to quench and air blast quenching.

Described quenching process divides two stages, is first that water liquid is quenched to 250-280 DEG C, then carries out air blast quenching to room temperature.

In following examples of the application, only have the composition of aluminium alloy to have any different, all the other steps of preparation method are identical, and other step therefore for preparation method does not carry out repeat specification.

Embodiment 1

A kind of composition preventing aluminium alloy from occurring large grain size, its composition is by weight percentage, the magnesium of 0.58%, the carbon of 0.03%, 0.75% silicon, 0.30% manganese, 0.1% chromium, 0.2% copper, 0.2% iron, 0.03 titanium, 0.001% vanadium, 0.01% strontium, 0.001% scandium, the neodymium of 0.001%, the molybdenum of 0.03% and surplus aluminium.

Embodiment 2

A kind of composition preventing aluminium alloy from occurring large grain size, its composition is by weight percentage, the magnesium of 0.61%, the carbon of 0.035%, 0.78% silicon, 0.35% manganese, 0.15% chromium, 0.24% copper, 0.4% iron, 0.05% titanium, 0.0015% vanadium, 0.03% strontium, 0.003% scandium, the neodymium of 0.003%, the molybdenum of 0.05% and surplus aluminium.

Embodiment 3

A kind of composition preventing aluminium alloy from occurring large grain size, its composition is by weight percentage, the magnesium of 0.60%, the carbon of 0.032%, 0.76% silicon, 0.33% manganese, 0.13% chromium, 0.22% copper, 0.3% iron, 0.04% titanium, 0.0013% vanadium, 0.015% strontium, 0.002% scandium, the neodymium of 0.0015%, the molybdenum of 0.045% and surplus aluminium.

Claims

1. the composition preventing aluminium alloy from occurring large grain size, it is characterized in that: its composition is by weight percentage, the aluminium of the scandium of the vanadium of the iron of the chromium of the silicon of the magnesium of 0.58-0.61%, the carbon of 0.03-0.035%, 0.75-0.78%, the manganese of 0.30-0.35%, 0.1-0.15%, the copper of 0.2-0.24%, 0.2-0.4%, the titanium of 0.03-0.05%, 0.001-0.0015%, the strontium of 0.01-0.03%, 0.001-0.003%, the neodymium of 0.001-0.003%, the molybdenum of 0.03-0.05% and surplus.