CN1316536A

CN1316536A - Al-alloy material for hub of car and its preparing process

Info

Publication number: CN1316536A
Application number: CN 01107885
Authority: CN
Inventors: 边秀房; 刘相俊; 潘学民; 臧立根; 曹惠中
Original assignee: Shandong University
Current assignee: Shandong University
Priority date: 2001-03-15
Filing date: 2001-03-15
Publication date: 2001-10-10
Anticipated expiration: 2021-03-15
Also published as: CN1172014C

Abstract

An Al alloy used for wheel hub of car contains Al, Si, Ce, Mg, Sr, Ti and B. Its preparing process includes such steps as smelting pure Al and industrial pure Si, adding A-rare earth intermediate alloy and Al-Ti-B intermediate alloy, cooling, pouring to obtain cast ingot, remelting and casting blank. Said wheel hub features better antiwear and anti-fatigue performance.

Description

A kind of Al-alloy material for hub of car and preparation method thereof

The invention belongs to metal material field, particularly relate to a kind of Al-alloy material that is used for automotive wheel and preparation method thereof.

Automobile is to wheel hub material performance requirement harshness, as very high rotoflector performance, very high intensity, good impelling strength and good abrasion resistance and fatigue performance.At present, the most of aluminium alloy wheel hub that adopts of the high-grade car of Japan, the aluminium alloy wheel hub production technique of western developed country is mature on the whole, but still in the ascendant to the research of new aluminium wheel hub material.According to Special Processes of Metal Castings and non-ferrous alloy (1994; (2): 27-29) report, the aluminium wheel hub alloy designations of open report has both at home and abroad:

Japan: Ac4C, Ac4A, ADC3, DX30;

The U.S.: A356; China: its composition of ZL101A sees Table 1.As seen from table, although the alloy designations difference of wheel hub, its basal component is close.

The A356 alloy is that typical hypoeutectic Al-Si-Mg is U.S.'s alloy designations, it usually in automobile, airplane industry as the structural part material, have good castibility, toughness, erosion resistance and fatigue performance.

Table 1 is aluminium wheel hub alloy composition both at home and abroad

Alloy designations	Chemical ingredients, %
	Chemical ingredients, %												????Si	???Mg	?Fe	?Cu	?Mn	?Zn	?Ni	??Ti	?Pb	?Sn	?Cr	?Al
	?Ac4C	?6.5 ???- ?7.5	?0.20 ???- ?0.40	?＜ ?0.2	?＜ ?0.2	?＜ ?0.1	?＜ ?0.1	?＜ ?0.05	??＜ ??0.2	?＜ ?0.05	?＜ ?0.05	?＜ ?0.05	????Si	???Mg	?Fe	?Cu	?Mn	?Zn	?Ni	??Ti	?Pb	?Sn	?Cr	?Al	Surplus
?A356	?Ac4C	?6.5 ???- ?7.5	?0.20 ???- ?0.40	?＜ ?0.2	?＜ ?0.2	?＜ ?0.1	?＜ ?0.1	?＜ ?0.05	??＜ ??0.2	?＜ ?0.05	?＜ ?0.05	?＜ ?0.05	?6.5 ???- ?7.5	?0.25 ??- ?0.45	?＜ ?0.2	?＜ ?0.2	?＜ ?0.1	?＜ ?0.1	?＜ ?0.05	??＜ ?0.2	?＜ ?0.05	?＜ ?0.05		Surplus	Surplus
?A356	ZA1Si7Mg	?6.5 ????- ?7.5	?0.25 ???- ?0.45	?＜ ?0.2	?＜ ?0.1	?＜ ?0.1	?＜ ?0.1		?0.08 ??- ?0.2	??＜ ?0.03	?＜ ?0.01		?6.5 ???- ?7.5	?0.25 ??- ?0.45	?＜ ?0.2	?＜ ?0.2	?＜ ?0.1	?＜ ?0.1	?＜ ?0.05	??＜ ?0.2	?＜ ?0.05	?＜ ?0.05		Surplus	Surplus

Above-mentioned aluminium wheel hub alloy material silicon content is low, needs to add elements such as copper, manganese, zinc, nickel; Particularly above-mentioned materials needs after heat treatment just can reach working condition requirement: be generally T6 and handle, complete again timeliness (250 ℃) after promptly quench (535 ℃).This processing method is thermal treatment cost height not only, and easily causes wheel distortion and scrap.

The objective of the invention is to overcome the problem of above-mentioned existence, developed and developed a kind of new Al-alloy material for hub of car and preparation method thereof.

The present invention realizes in the following manner: a kind of Al-alloy material for hub of car comprises aluminium, silicon, cerium, magnesium, strontium, titanium, boron, the mass percent of each component is: silicon 10-12%, cerium 0.03-0.08%, magnesium 0.2-0.5%, strontium 0.02-0.04%, titanium 0.1-0.2%, boron 0.1-0.2%, all the other are aluminium.

The preparation of Al-alloy material for hub of car, realize by following steps:

(1) at first press fine aluminium 85-90%, industrial pure silicon 9.6-14.85%, aluminium rare earth intermediate alloy 0.05-0.10%,

The mass percent of Al-Ti-B intermediate alloy 0.1-0.3% takes by weighing raw material;

(2) in smelting furnace, fine aluminium, industrial pure silicon are melted to 750-900 ℃, add successively then and to have weighed up

Aluminium rare earth intermediate alloy, Al-Ti-B intermediate alloy are stirred to rapidly and mix;

(3) with the molten metal cooling, be cast into ingot casting at 720-750 ℃;

(4) ingot casting is cast into blank after 750-800 ℃ of remelting, through 120-150 ℃ of artificial aging 2-8 hour.

The automotive hub of the present invention's preparation can reach the mechanical property of U.S. A356 after T6 handles.Mechanical property after U.S. A356 alloy T6 processing and 120-150 ℃ of artificial aging of alloy of the present invention (AlSillwheel) relatively sees Table 2:

Table 2 A356 alloy T6 handles and AlSillwheel alloy artificially aged mechanical property

Alloy	????A356		?AlSillwheel
Alloy	????A356		?AlSillwheel		?Mpa	?262	?270	???272	????267
Unit elongation %	??6	??7	???6.2	????7.2	?Mpa	?262	?270	???272	????267

Provide a most preferred embodiment of the present invention below:

1. at first press in fine aluminium 88.7%, industrial pure silicon 11%, aluminium rare earth intermediate alloy 0.10%, the aluminium titanium boron

Between the mass percent of alloy 0.2% take by weighing raw material;

2. in smelting furnace, fine aluminium, industrial pure silicon are melted to 900 ℃, add the aluminium that has weighed up then successively

Rare earth intermediate alloy, Al-Ti-B intermediate alloy are stirred to rapidly and mix;

3. with the molten metal cooling, be cast into ingot casting at 720 ℃;

4. ingot casting is cast into blank after 750 ℃ of remeltings, through 150 ℃ of artificial agings 5 hours.

Obtain a kind of wheel hub material of the best according to above-mentioned technology, its chemical ingredients (mass percent) is: silicon 10%, and cerium 0.05%, magnesium 0.2%, strontium 0.04%, titanium 0.1%, boron 0.1%, all the other are aluminium; Its mechanical property is: tensile strength 270Mpa, unit elongation 7.2%.

Claims

1. Al-alloy material for hub of car, comprise aluminium, silicon, magnesium, titanium, it is characterized in that it also comprises cerium, strontium, boron, the mass percent of each component is: silicon 10-12%, cerium 0.03-0.08%, magnesium 0.2-0.5%, strontium 0.02-0.04%, titanium 0.1-0.2%, boron 0.1-0.2%, all the other are aluminium.

2. method for preparing above-mentioned Al-alloy material for hub of car, it is characterized in that may further comprise the steps: (1) at first takes by weighing raw material by the mass percent of fine aluminium 85-90%, industrial pure silicon 9.6-14.85%, aluminium rare earth intermediate alloy 0.05-0.10%, Al-Ti-B intermediate alloy 0.1-0.3%; (2) in smelting furnace, fine aluminium, industrial pure silicon are melted to 750-900 ℃, add aluminium rare earth intermediate alloy, the Al-Ti-B intermediate alloy weighed up then successively, be stirred to rapidly and mix; (3) with the molten metal cooling, be cast into ingot casting at 720-750 ℃; (4) ingot casting is cast into blank after 750-800 ℃ of remelting, through 120-150 ℃ of artificial aging 2-8 hour.