CN101629258A

CN101629258A - Excellent RE-containing cast aluminum alloy material for automobile parts and method for manufacturing same

Info

Publication number: CN101629258A
Application number: CN200810123045A
Authority: CN
Inventors: 费稼德
Original assignee: Taicang Hubei Special Aluminum Co Ltd
Current assignee: Taicang Hubei Special Aluminum Co Ltd
Priority date: 2008-07-15
Filing date: 2008-07-15
Publication date: 2010-01-20

Abstract

The invention relates to an excellent RE-containing cast aluminum alloy material for automobile parts. The alloy material is characterized in that the alloy material comprises the following components in percentage by mass: 4.5 to 8.0 percent of Si, 0.1 to 0.5 percent of Mg, and 0.1 to 0.45 percent of RE, wherein the contents of trace elements contained in the alloy material comprise the following: less than 0.1 percent of Mn, less than 0.1 percent of Ni, less than 0.1 percent of Zn, less than 0.05 percent of Ca, less than 0.1 percent of B, less than 0.1 percent of Li, less than 0.1 percent of Cu, less than 0.2 percent of Ti, less than 0.2 percent of Pb, less than 0.05 percent of Sn, and the balance of Al. The alloy material is manufactured by unique technology; and due to the direct addition of RE in a melting process, the energy is saved, and the components are even and segregation-free, so that the alloy material is an excellent material for the automobile industry or other industries.

Description

A kind of automobile component good cast aluminum alloy material and manufacture method that contains RE

Technical field

The present invention relates to a kind of automobile component good cast aluminum alloy material and manufacture method that contains RE.

Background technology

On current domestic and international market, automobile more and more becomes people's life integral part, and particularly the car demand is also increasing to automobile, so form the automobile component great market, selecting good cast aluminum alloy material is the task of top priority.

Report from domestic and foreign literature, disclose a kind of refinement aluminium alloy crystal grain and manufacture method as Donghua University, it is characterized in that chemical ingredients (massfraction) is Si:0.2 ~ 7.5, Mn:0.05 ~ 1.5, Mg:0.05 ~ 6.0, Zn:0.03 ~ 8.5, Cu:0.05 ~ 7.0, Ni:0.1 ~ 2.5, Ti:0.01 ~ 0.15, RE:0.01 ~ 0.3, B:0.0001 ~ 0.1, all the other are Al.Its technology characteristics adds (a) silicon, titanium aluminum oxide, borax or rare earth oxide or rare earth carbonate or rare earth carbonate in aluminium cell, or (b) titanium oxide, borax and rare earth oxide or rare earth carbonate, need to add manganese oxide copper compound or nickel compound, just can obtain not add the fining agent of master alloy type, effect is strong, perdurability is long, is suitable for to make auto parts or the like.And for example, University Of Chongqing discloses the high-performance aluminium diecast alloy, it is characterized in that being made up of Al, Si, Cu, Mg, mishmetal RE, Mn, Zn, Fe etc., the component concentration weight percent is Si:9.5 ~ 11.5, Cu:2.0 ~ 3.0, Mg:0.3 ~ 0.4, RE:0.1 ~ 0.3, Mn≤0.5, Zn≤1.0, Fe≤1.0, all the other are Al, not only have good flowability, also have good performance of science and cutting processing.Zhejiang Chen Yuedan discloses process for preparing aluminium alloy damping cylinder for another example, this invention proposition is packed into greater than 6% aluminium alloy with silicon content and is kept continuously melting in the stove, uses dry powder composite treating agent (NaCl-35%, the KCl-35% of total solution weight 0.2 ~ 0.5% again, CaF-15%, Na ₂AlF ₆-10%, the Al-RE master alloy is formed), the smelting furnace liquid outlet is blown into the nitrogen refining treatment, detects to pour into casting mold after qualified and cast out product, and this invention makes that foundry goods has that solidity to corrosion, slag are few, cast(ing) surface pore advantage such as less.

All mention adding RE element aluminium alloy from foregoing invention.Last invention is that RE oxide compound or salt are added in the aluminium cell, and its output is big, is not suitable for middle-size and small-size factory and uses, and lacks handiness, maneuvering ability.The application of RE has only been said in another invention, does not say how RE adds.Back one invention has said that employing Al-RE master alloy form adds, and contains RE and reach 15%, and high like this content master alloy will produce macrosegregation.

Summary of the invention

Purpose of the present invention then is at above-mentioned the deficiencies in the prior art, provides a kind of energy of promptly saving in fusion process to make the automobile component usefulness of the even segregation-free of composition contain good cast aluminum alloy material and the manufacture method of RE again.

Technical scheme of the present invention is as follows:

A kind of automobile component is characterized in that the mass percent of each composition in the alloy is: Si:4.5～8.0%, Mg:0.1～0.5% with the good cast aluminum alloy material that contains RE, RE:0.1～0.45%, the concrete content of wherein contained each moiety of trace element, Mn＜0.1%, Ni＜0.1%, Zn＜0.1%, Ca＜0.05%, B＜0.1%, Li＜0.1%, Cu＜0.1%, Ti＜0.2, Pb＜0.2%, Sn＜0.05%, surplus is Al, and described each component concentration sum is 100%.

The manufacture method of above-mentioned materials is with Si:4.5～8.0%, Mg:0.1～0.5%, RE:0.1～0.45%, the concrete content of wherein contained each moiety of trace element, Mn＜0.1%, Ni＜0.1%, Zn＜0.1%, Ca＜0.05%, B＜0.1%, Li＜0.1%, Cu＜0.1%, Ti＜0.2, Pb＜0.2%, Sn＜0.05%, surplus is Al, described each component concentration sum is 100%, after carrying out proportioning, add melting in the smelting furnace, the control smelting temperature, through stirring, concise, slagging-off, be cast into alloy cast ingot at last.

The present invention with the disposable input of RE, reduces the scaling loss and the save energy of alloy when smelting aluminium alloy, particularly add the salt alterant that has replaced the aluminium alloy smelting routine to use behind the RE, has alleviated environmental pollution.Because the adding of RE, flowability, the resistance to air loss of alloy all are improved, mechanical property good (F state) σ _bImprove more than 25%, δ improves more than 33%.

Embodiment

Below in conjunction with embodiment the present invention is further described:

The mass percent of each composition optimum is in the alloy of the present invention:

A kind of manufacturing contains the method for the good cast aluminum alloy material of RE: alloy is made up of Si, Mg, Al and rare earth elements RE, described material also comprises trace additives, described trace additives choosing has one or more among Mn, Ni, Zn, Ca, B, Li, Cu, Ti, Pb, the Sn, and described trace additives total content is below 0.5%, and Fe is controlled at below 0.2% for the unavoidable impurities element.With Si:4.5～8.0%, Mg:0.1～0.5%, RE:0.1～0.45%, Al are surplus.The concrete content of wherein contained each moiety of trace element, Mn＜0.1%, Ni＜0.1%, Zn＜0.1%, Ca＜0.05%, B＜0.1%, Li＜0.1%, Cu＜0.1%, Ti＜0.2, Pb＜0.2%, after the various elements of Sn＜0.05% carry out proportioning according to the above ratio, add melting in the smelting furnace, the control smelting temperature, through stirring, refining, slagging-off, be cast into alloy cast ingot at last.Refining uses rare gas element to add the WL-1 refining agent, and refining finishes to check air content, skims, is cast into ingot casting after qualified.The alloy cast ingot of casting is of a size of 560mm * 135mm * 60mm.

Adopt technical scheme of the present invention compared with prior art, add trace additives.Owing to, overcome influence each other of each element and the negative interaction that is produced by the mass percent of each composition of reasonable configuration.Special Mg and RE unit have and intensify effect mutually, make alloy flowability become good, and metamorphism is arranged.Even alloy remelting still keeps this effect, thereby reduce environmental pollution.This alloy adopts unique prepared, and RE directly adds in fusion process, and not only save the energy but also made the even segregation-free of composition, be the rare excellent material of automobile or other industry.

Alloy material of the present invention is through the mechanical property sample of cast-in-place, and after testing, tensile strength improves more than 25%, and unit elongation improves more than 33%.

Claims

1, a kind of automobile component is characterized in that the mass percent of each composition in the alloy is: Si:4.5～8.0%, Mg:0.1～0.5% with the good cast aluminum alloy material that contains RE, RE:0.1～0.45%, the concrete content of wherein contained each moiety of trace element, Mn＜0.1%, Ni＜0.1%, Zn＜0.1%, Ca＜0.05%, B＜0.1%, Li＜0.1%, Cu＜0.1%, Ti＜0.2, Pb＜0.2%, Sn＜0.05%, surplus is Al, and described each component concentration sum is 100%.

2, a kind of automobile component is characterized in that with Si:4.5～8.0% Mg:0.1～0.5% with the manufacture method of the good cast aluminum alloy material that contains RE, RE:0.1～0.45%, the concrete content of wherein contained each moiety of trace element, Mn＜0.1%, Ni＜0.1%, Zn＜0.1%, Ca＜0.05%, B＜0.1%, Li＜0.1%, Cu＜0.1%, Ti＜0.2, Pb＜0.2%, Sn＜0.05%, surplus is Al, and described each component concentration sum is 100%, carry out proportioning after, add melting in the smelting furnace, the control smelting temperature is through stirring, concise, slagging-off is cast into alloy cast ingot at last.

3, automobile component according to claim 2 is characterized in that adding the WL-1 refining agent with rare gas element in the refining with the manufacture method of the good cast aluminum alloy material that contains RE.

4, automobile component according to claim 2 is characterized in that with the manufacture method of the good cast aluminum alloy material that contains RE the alloy cast ingot of casting is of a size of 560mm * 135mm * 60mm.