CN105200283A

CN105200283A - New process avoiding coarse 6063 extrusion aluminum alloy crystals

Info

Publication number: CN105200283A
Application number: CN201410291572.XA
Authority: CN
Inventors: 张亚荟
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-06-26
Filing date: 2014-06-26
Publication date: 2015-12-30

Abstract

The invention discloses 6063 extrusion aluminum alloy. The 6063 extrusion aluminum alloy is characterized by being prepared from, by mass, 0.6-0.7% of Si, smaller than 0.35% of Fe, 0.2-0.3% of Cu, smaller than 0.1% of Mn, 1.0-1.1% of Mg, 0.05-0.08% of Cr, smaller than 0.15% of Zn, smaller than 0.15% of Ti and the balance Al. A new process avoiding coarse 6063 extrusion aluminum alloy crystals is characterized in that in a 6063 aluminum alloy ingot homogenization process, the set temperature is 550 DEG C, and the heat preservation time is 6 h to 8 h; the cooling mode is that water cooling is conducted after the temperature is lowered to 200 DEG C through strong wind cooling, the extrusion temperature is 420-440 DEG C, and the extrusion speed is 1.5-2.0 m/min; according to the extrusion panel quenching process parameters, the furnace heating room temperature is 525 DEG C, the heat preservation time is determined according to the panel thickness, and the ageing process is 175 DEG C and 10 h.

Description

A kind of novel process avoiding 6063 extruding aluminium alloy coarse grains

Technical field

The present invention relates to a kind of production technique of 6063 aluminium alloys, particularly a kind of novel process avoiding 6063 extruding aluminium alloy coarse grains.

Background technology

6063 aluminium alloys belong to A-lMg-Si system, are characterized in: have medium tenacity, have good plasticity, excellent weldability and erosion resistance, particularly stress-free corrosion tearing tendency.Aluminum alloy plate materials is often based on rolling mode production, and the exploitation of large gauge extrusion plate is on the basis that aluminium alloy application market constantly expands, in order to meet the demand of domestic and international client, Cai produce by large-scale extrusion equipment.Compared with rolled plate, extrusion plate is after same thermal treatment process, and its mechanical property is general all higher, and product has more performance advantage in further processed and applied.But when producing 500mm100mm, 710mm8mm stock board, because the link of heating is many, there is the phenomenon that performance is uneven in product, and portioned product have also appeared the situation of hot-work after strain when being delivered for use.Through carrying out low power inspection discovery to the section of product, the macrostructure of goods section occurs that periphery crystal grain is tiny, and center matrix portion crystal is thick, checks that the mechanical property of corresponding site finds that its performance is generally on the low side.Our extrusion plate larger to specification has carried out research of technique for this reason.

Summary of the invention

The technical problem to be solved in the present invention is: the preparation technology providing a kind of 6063 aluminium alloys, avoids 6063 extruding aluminium alloy coarse grains, to obtain excellent performance.

Technical scheme of the present invention is: a kind of 6063 extruding aluminium alloys, aluminum alloy chemical composition massfraction: Si:0.6-0.7, Fe<0.35, Cu:0.2-0.3, Mn<0.1, Mg:1.0-1.1, Cr:0.05-0.08, Zn<0.15, Ti<0.15, all the other Al.

Avoid a novel process for 6063 extruding aluminium alloy coarse grains, the homogenization process of 6063 aluminium alloy cast ingots: design temperature 550 DEG C; Soaking time 6h-8h; The type of cooling, strong wind cooling to 200 DEG C again water-cooled, extrusion temperature is 420-440 DEG C, and extrusion speed is 1.5-2.0m/min, extrusion plate quenching process parameters: stove heating chamber temperature 525, and soaking time is determined according to sheet metal thickness, and institution of prescription is 175 DEG C, 10h.

Beneficial effect of the present invention: the chemical composition and the ingot homogenization temperature that suitably adjust 6063 aluminium alloys, shorten homogenizing soaking time, adopt rapid heating during extruding, reduce extrusion temperature and extrusion speed, reduce quenching temperature, the measures such as suitable adjustment Holding Time at Austenitizing Temperature, can make the mechanical property at each position of 6063-T6511 aluminium alloy large gauge extrusion plate reach the requirement of standard.

Embodiment

First start with from ingot casting composition, formulated the chemical composition Adjusted Option of 6063 aluminium alloy large gauge ingot castings, in table 1.Secondly adjust homogenization process, extrusion process, quenching technology, aging technique etc., according to the difference of specification, Holding Time at Austenitizing Temperature is different.Concrete extrusion process parameters is in table 2.

The homogenization process of 6063 aluminium alloy cast ingots: design temperature 550; Soaking time 6h ~ 8h; The type of cooling, strong wind cooling to 200 is water-cooled again.Extrusion plate quenching process parameters: stove heating chamber temperature 525, soaking time is as shown in table 3 according to sheet metal thickness.Institution of prescription is 175,10h.Product checking performance mechanics results of property after adjusting component and technique is in table 4.

Test result analysis

As can be seen from Table 4, after adjusting component, technique, the performance of all size sheet material all exceedes the required value in this standard; Product macrostructure inspection after extruding, thermal treatment shows, the macrostructure of sheet material cross section is evenly fine and closely woven, and grain fineness number reaches 2 grades ~ 3 grades.The aluminium alloy extruded sheet material of 6063-T6511 is by adjustment homogenization temperature and shorten soaking time, adopt rapid heating ingot blank, reduce extrusion temperature and extrusion speed, reduce quenching temperature, adjustment Holding Time at Austenitizing Temperature, can make sheet material middle portion also obtain tiny grain structure, do not affect the solid solution more fully of Mg2Si phase simultaneously yet, Bd phase can be made when timeliness to separate out by proper extension aging time more even, thus after making thermal treatment, material structure is fine and closely woven, mechanical property improves.

In most cases, the crystal grain of material all can increase and alligatoring along with solid solubility temperature, this is because all developed into the grain growth stage during actual heating, its alligatoring is actually the result of grain growth.Temperature is higher, and the recrystallize deadline is shorter, and under identical soaking time, the grain growth time is longer, and under high temperature, grain growth speed is also larger, therefore finally obtains thick crystal grain.The major cause increasing rate of heating refinement recrystal grain is: during rapid heating, Recovery Process has little time to carry out or carry out very insufficient, therefore, cold deformation energy storage can not be made significantly to reduce.Rapid heating improves actual recrystallize and starts temperature, nucleation rate is strengthened, and in addition, rapid heating can reduce the obstruction second-phase of grain growth and the dissolving of other impurity particles, grain growth trend is weakened, and this is also the rate of heating reason more responsive to polyphase alloy.

Conclusion

The chemical composition of suitable adjustment 6063 aluminium alloy and ingot homogenization temperature, shorten homogenizing soaking time, adopt rapid heating during extruding, reduce extrusion temperature and extrusion speed, reduce quenching temperature, the measures such as suitable adjustment Holding Time at Austenitizing Temperature, can make the mechanical property at each position of 6063-T6511 aluminium alloy large gauge extrusion plate reach the requirement of standard.

Claims

1. an extruding aluminium alloy, it is characterized in that: aluminum alloy chemical composition massfraction: Si:0.6-0.7, Fe<0.35, Cu:0.2-0.3, Mn<0.1, Mg:1.0-1.1, Cr:0.05-0.08, Zn<0.15, Ti<0.15, all the other Al.

2. a kind of novel process avoiding 6063 extruding aluminium alloy coarse grains as claimed in claim 1, is characterized in that: the homogenization process of 6063 aluminium alloy cast ingots: design temperature 550 DEG C; Soaking time 6h-8h; The type of cooling, strong wind cooling to 200 DEG C again water-cooled, extrusion temperature is 420-440 DEG C, and extrusion speed is 1.5-2.0m/min, extrusion plate quenching process parameters: stove heating chamber temperature 525, and soaking time is determined according to sheet metal thickness, and institution of prescription is 175 DEG C, 10h.