CN104611654B

CN104611654B - A kind of reduction wide cut anisotropic homogenizing heat treatment of aluminum sheet material

Info

Publication number: CN104611654B
Application number: CN201510085652.4A
Authority: CN
Inventors: 张静; 杨亮; 左汝林
Original assignee: Chongqing University
Current assignee: Chongqing University
Priority date: 2015-02-17
Filing date: 2015-02-17
Publication date: 2016-08-17
Anticipated expiration: 2035-02-17
Also published as: CN104611654A

Abstract

The invention discloses a kind of reduction wide cut anisotropic homogenizing heat treatment of aluminum sheet material, 5052 alloys will add the rare earth element er of 0.1 ~ 0.5 wt%；Carry out two-stage or three grades of homogenization heat treatments again；Described two-stage homogenization heat treatment first carries out the homogenization insulation of 20 ~ 30 h at 530 ~ 560 DEG C, is subsequently cooled to 150 ~ 300 DEG C and continues insulation 8 ~ 12 h, and air cooling of then coming out of the stove is to room temperature；Described three grades of homogenization heat treatments first carry out the homogenization insulation of 20 ~ 30 h at 530 ~ 560 DEG C, are subsequently cooled to 150 ~ 180 DEG C of insulation 8 ~ 12 h, further heat up to 300 ~ 320 DEG C of continuation insulation 8 ~ 12 h, and air cooling of then coming out of the stove is to room temperature.Use the method can effectively control solid solution and the precipitation of the second phase, make the most molten effective nodularization of non-equilibrium compound in alloy, hence it is evident that improve the plasticity of alloy, reduce tissue and the anisotropy of deformation of rolled plate.

Description

A kind of reduction wide cut anisotropic homogenizing heat treatment of aluminum sheet material

Technical field

The invention belongs to aluminum alloy processing technology field, reduce the wide cut anisotropic homogenizing heat treatment of aluminum sheet material particularly to one.

Background technology

Energy environment issues constantly promotes lightweighting materials application in transportation, Aero-Space.Aluminium alloy is owing to having light weight, high specific strength, corrosion-resistant and be readily formed the advantages such as processing, and its application is increasingly extensive.In recent years, along with China's rapid development of economy, the lifting of manufacturing emergence and national consumption level, facilitate with transportation, pack, print increasing sharply of high-grade wide cut Aluminum Plate and Strip demand as representative.The especially transportation Aluminum Plate and Strip such as aluminium container, refrigerated van type car, coal conveyor, it is desirable to fabric width is not less than 2600mm.The 5XXX system alloy that this kind of sheet material is the most anti-corrosion in generally using, wherein 5052 alloys are owing to having more preferably decay resistance and deformation processing performance and excellent solderability and fatigue strength, are more suitable for preparing wide plate.

But, due to sheet material edge and the difference of center deformation condition in the operation of rolling, along with the increase of sheet material fabric width, on strip width direction, unhomogeneity of deformation increases, and causes the aggravation of sheet material Mechanical Property Anisotropy degree, roll control difficulty to increase.This causes wide cut aluminum sheet metal thickness, width, big with plate difference equidimension deviation, easily occurs that limit is split, burnt the defects such as trace, the problems such as yield rate is low.These high-end Aluminum Plate and Strip still a large amount of dependence on import at present, this seriously constrains China Transportation Industry product lightweight and the paces of energy-saving and emission-reduction.Therefore, the wide cut Aluminum Plate and Strip of high-quality to be produced, the homogeneity question that sheet alloy all directions in the urgent need to address are organized and deformed.

Summary of the invention

For deficiencies of the prior art, it is an object of the invention to provide a kind of wide cut anisotropic homogenizing heat treatment of aluminum sheet material that reduces, the homogeneity question that solution sheet alloy all directions are organized and deformed.

Realizing above-mentioned purpose, the present invention adopts the following technical scheme that a kind of reduction wide cut anisotropic homogenizing heat treatment of aluminum sheet material, will add the rare earth element er of 0.1 ~ 0.5 wt% in 5052 alloys；Carry out two-stage or three grades of homogenization heat treatments again；

First 5052 alloy cast ingots are carried out the homogenization insulation of 20 ~ 30 h, i.e. one-level homogenization, are subsequently cooled to 150 ~ 300 DEG C and continue insulation 8 ~ 12 h by described two-stage homogenization heat treatment at 530 ~ 560 DEG C, and i.e. two grades homogenization, air cooling of then coming out of the stove is to room temperature；

Described three grades of homogenization heat treatments, first 5052 alloy cast ingots are carried out at 530 ~ 560 DEG C the homogenization insulation of 20 ~ 30 h, i.e. one-level homogenization, it is subsequently cooled to 150 ~ 180 DEG C of insulation 8 ~ 12 h, i.e. two grades homogenization, further heating up to 300 ~ 320 DEG C of continuation insulation 8 ~ 12 h, i.e. three grades homogenization, air cooling of then coming out of the stove is to room temperature.

Especially, in described two-stage homogenization heat treatment, one-level homogenization temperature is 560 DEG C, temperature retention time 30h；Two grades of homogenization temperatures are 150 DEG C or 300 DEG C, temperature retention time 10h.

Further, in described three grades of homogenization heat treatments, one-level homogenization temperature is 560 DEG C, temperature retention time 30h；Two grades of homogenization temperatures are 150 DEG C, temperature retention time 10h；Three grades of homogenization temperatures are 300 DEG C, temperature retention time 10h.

For optimized alloy performance, give full play to the multistage uniform metallization processes effect in terms of improving alloy structure and deformation uniformity that the present invention proposes, add the rare earth element er of 0.1 ~ 0.5 wt%.

Compared to existing technology, there is advantages that

1, in multistage (two-stage or three grades) homogenization, the first order uses high-temperature homogenization heat treatment, promotes non-equilibrium crystallization thick in alloy fully solid solution mutually；Wherein temperature is the principal element affecting Elements Diffusion, uses the method can effectively control solid solution and the precipitation of the second phase, makes the most molten effective nodularization of non-equilibrium compound in alloy, hence it is evident that improves the plasticity of alloy, reduces tissue and the anisotropy of deformation of rolled plate.

2, in multistage (two-stage or three grades) homogenization, the second level and the third level can control precipitation and size, the form of second phase particles, are the key steps determining precipitated phase distribution.To two-stage homogenization heat treatment, in the range of 150 ~ 300 DEG C of cryogenic temperatures, carry out the second level heat treatment of 8 ~ 12h, promote that second phase particles separates out, reduce the solution strengthening effect of alloying element, drop low-alloyed work hardening rate；Promote the most molten non-equilibrium compound nodularization, hence it is evident that improve the plasticity of alloy simultaneously, reduce tissue and the anisotropy of deformation, the follow-up rolling deformation of rolled plate.In order to optimize the precipitation state of second phase particles further, improve the plastic deformation ability of alloy, use three grades of homogenization heat treatments further, first in the range of 150 ~ 180 DEG C of relatively low temperature, carry out the second level heat treatment of 8 ~ 12 h, to increase the driving force that precipitated phase separates out, thus improve the nucleation rate of precipitated phase, improve precipitation density, then heat to 300 ~ 320 DEG C and continue insulation 8 ~ 12 h, promote agglomeration and the nodularization of precipitated phase.Through such three grades of Homogenization Treatments, precipitated phase can be made to separate out more fully, be more evenly distributed, not only reduce the solution strengthening effect of element, and grow up and nodularization, the adverse effect that decreases the second relative plastic deformation due to suitable.

3, in 5052 alloys, add the rare earth element er of 0.1 ~ 0.5 wt%, on the one hand can be with crystal grain thinning and the size of non-equilibrium compound phase；On the other hand can remove Impurity Fe, Si, play and purify and the effect of purified aluminium melt, this is all conducive to putting forward heavy alloyed Plastic Forming performance.Secondly, the addition of Er improves alloy melting point, such that it is able at higher temperatures heat treatment and unlikely cause the defects such as overheated or burning；Meanwhile, Er promotes the dissolving in Homogenization Process of the Al-Fe compound, is conducive to eliminating non-equilibrium cast sturcture.Finally, during the Homogenization Treatments of the second level or the third level, Er separates out from Al matrix with the form of Al-Zr-Er ternary compound, plays refinement recrystallized structure and the effect of dispersion-strengtherning, is conducive to improving alloy plasticity and intensity.

4. the reduction wide cut anisotropic homogenizing heat treatment of aluminum sheet material that the present invention proposes, is not required to increase extra equipment and investment, low cost, and the suitability is wide, it is easy to accomplish industrial-scale production.

Accompanying drawing explanation

Fig. 1 is alloy after two-stage Homogenization Treatments at 0 °, 45 °, mechanical property figure on 90 ° of directions.

Detailed description of the invention

Being described in further detail the present invention below in conjunction with specific embodiments and the drawings, in embodiment if no special instructions, the raw material of employing is common commercially available prod.

Embodiment 1 :A kind of reduction wide cut anisotropic homogenizing heat treatment of aluminum sheet material, comprises the steps:

Use 5052 alloy cast ingots that with the addition of 0.3 wt% Er, then this alloy is carried out two-stage homogenization heat treatment.

First, homogenization insulation (one-level homogenization) of 30 h is carried out at 560 DEG C；

Subsequently, it is cooled to 300 DEG C and continues insulation bis-grades of homogenization of 10 h(), air cooling of then coming out of the stove is to room temperature.

Ingot casting through above-mentioned two-stage Homogenization Treatments carrying out hot rolling, rolling temperature 470 DEG C, before rolling, rolling blank is carried out 470 DEG C, the preheating of 1 h, rolling overall reduction is 73%；The sheet material obtaining rolling carries out room temperature tensile Mechanics Performance Testing along rolling direction, vertical rolling direction and 45 ° of directions, and test result is as shown in Figure 1.As seen from Figure 1, the elongation percentage on three directions of rolled plate all reaches more than 25%, and on three directions, the ratio of elongation percentage is 1:0.8:1.3, and anisotropy significantly reduces.

Embodiment 2 :A kind of reduction wide cut anisotropic homogenizing heat treatment of aluminum sheet material, comprises the steps:

5052 alloys will add 0.2 wt%(or 0.3 wt% or 0.4wt%) rare earth element er, then carry out three grades of homogenization heat treatments:

First, 5052 alloy cast ingots adding rare earth element er are incubated 560 DEG C of homogenization carrying out 30 h, i.e. one-level homogenization；

Subsequently, it is cooled to 150 DEG C of insulation 10 h, i.e. two grades homogenization；

Then, it is warming up to 300 DEG C, continues insulation 10 h, i.e. three grades homogenization；

Finally, air cooling is come out of the stove to room temperature.

Ingot casting through above-mentioned three grades of Homogenization Treatments carrying out hot rolling, rolling temperature 470 DEG C, before rolling, rolling blank is carried out 470 DEG C, the preheating of 1 h, rolling overall reduction is 73%；The sheet material obtaining rolling carries out room temperature tensile Mechanics Performance Testing along rolling direction, vertical rolling direction and 45 ° of directions, elongation percentage on three directions of rolled plate all reaches more than 30%, on three directions, the ratio of elongation percentage is 1:0.8:1.1, and anisotropy significantly reduces.

Finally illustrate is, above example is only in order to illustrate technical scheme and unrestricted, although the present invention being described in detail with reference to preferred embodiment, it will be understood by those within the art that, technical scheme can be modified or equivalent, without deviating from objective and the scope of technical solution of the present invention, it all should be contained in the middle of scope of the presently claimed invention.

Claims

1. one kind is reduced the wide cut anisotropic homogenizing heat treatment of aluminum sheet material, it is characterised in that will add 0.2 wt%, 0.3 wt% or 0.4 in 5052 alloy cast ingots The rare earth element er of wt%；Carry out three grades of homogenization heat treatments again；

First, 5052 alloy cast ingots are carried out the homogenization insulation of 20 ~ 30 h, i.e. one-level homogenization at 530 ~ 560 DEG C；

Subsequently, it is cooled to 150 ~ 180 DEG C of insulation 8 ~ 12 h, i.e. two grades homogenization；

Then, it is warming up to 300 ~ 320 DEG C and continues insulation 8 ~ 12 h, i.e. three grades homogenization；

Finally, air cooling is come out of the stove to room temperature.

Reduce the wide cut anisotropic homogenizing heat treatment of aluminum sheet material the most according to claim 1, it is characterised in that in described three grades of homogenization heat treatments, one-level homogenization temperature is 560 DEG C, temperature retention time 30 h；Two grades of homogenization temperatures are 150 DEG C, temperature retention time 10 h；Three grades of homogenization temperatures are 300 DEG C, temperature retention time 10 h.