CN105220089A

CN105220089A - The preparation technology of a kind of raising 6061 aluminium alloy capabilities

Info

Publication number: CN105220089A
Application number: CN201410288546.1A
Authority: CN
Inventors: 罗伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-06-25
Filing date: 2014-06-25
Publication date: 2016-01-06

Abstract

The invention discloses the preparation technology of a kind of raising 6061 aluminium alloy capabilities, it is characterized in that: comprise following steps: first raw material base is heated in resistance furnace 470 DEG C of insulation 2h, by multistage hot deformation to thick 3.3mm, as the raw material of rolling contrast experiment, subsequently thin plate is carried out solution treatment, sample through solution treatment is carried out room temperature rolling and deep cooling rolling respectively, two kinds of equal rolling passes of rolling method, total deformation is 50-80%, wherein in the deep cooling operation of rolling, sample is all placed on immersion 10 ~ 15min in liquid nitrogen by every time before rolling, sample after room temperature rolling and deep cooling rolling is carried out short annealing process at 100-250 DEG C respectively, all 15min is incubated at each temperature, then air cooling is to room temperature.

Description

The preparation technology of a kind of raising 6061 aluminium alloy capabilities

Technical field

The present invention relates to a kind of synthesis technique of 6061 aluminium alloys, particularly the synthesis technique of raising 6061 aluminium alloy capability.

Background technology

The application of aluminium is very wide in a metal, be only second to iron and steel, and content ranking is at the metallic element of first place, is thus called as second largest metalloid material.6061 aluminium alloy market outlook are good, with high content of technology, have delayed effect of development, can form industry and play a significant role to our province industry restructuring.The coordinated balance of energy retention, economy, environment, resource simultaneously.Be the direction promoted in world wide and develop, there is important social benefit and environmental benefit.

Summary of the invention

The technical problem to be solved in the present invention is: the preparation technology providing a kind of 6061 aluminium alloys, to obtain 6016 alloys of excellent performance.

Technical scheme of the present invention is: the preparation technology of a kind of raising 6061 aluminium alloy capabilities, comprise following steps: first raw material base is heated in resistance furnace 470 DEG C of insulation 2h, by multistage hot deformation to thick 3.3mm, as the raw material of rolling contrast experiment, subsequently thin plate is carried out solution treatment, sample through solution treatment is carried out room temperature rolling and deep cooling rolling respectively, two kinds of equal rolling passes of rolling method, total deformation is 50-80%, wherein in the deep cooling operation of rolling, sample is all placed on immersion 10 ~ 15min in liquid nitrogen by every time before rolling, sample after room temperature rolling and deep cooling rolling is carried out short annealing process at 100-250 DEG C respectively, all 15min is incubated at each temperature, then air cooling is to room temperature.

Comprehensive deflection is 80%.

Returning temperature is fast: 180 DEG C.

Beneficial effect of the present invention: no matter 6061 aluminium alloys are deep cooling rolling or room temperature rolling, and with the rising of annealing temperature, sample hardness first raises rear reduction, reach maximum value about 180 DEG C hardness; Deep cooling rolling 6061 aluminium alloy is when low-temperature annealing, and elongation exists two peak values.When temperature is 100 ~ 180 DEG C, elongation increases, and when temperature is 180 ~ 200 DEG C, elongation falls.

Accompanying drawing explanation

Fig. 1 is annealing temperature and Vickers' hardness relation curve;

Fig. 2 is micro-organization chart under deep cooling rolling 6061 aluminium alloy different annealing temperature.

Embodiment

First raw material base is heated in resistance furnace 470 DEG C of insulation 2h, by multistage hot deformation to thick 3.3mm, as the raw material of rolling contrast experiment, subsequently thin plate is carried out solution treatment.Sample through solution treatment is carried out room temperature rolling and deep cooling rolling respectively, two kinds of rolling method equal rolling 7 passages, total deformation is 80%, and wherein in the deep cooling operation of rolling, sample is all placed on immersion 10 ~ 15min in liquid nitrogen by every time before rolling.Sample after room temperature rolling and deep cooling rolling is carried out short annealing process at 100,150,180,200 and 250 DEG C respectively, and be all incubated 15min at each temperature, then air cooling is to room temperature.The dice that rear sample cuts into 10mm × 10mm × 3.3mm will be rolled, and with sand paper, rolled surface is polished to carry out Vickers' hardness detection.The selected loading counterweight of hardness test is 10kg, loading time 10s.For guaranteeing the accuracy of experimental data, often kind of annealing temperature prepares two parallel samples, and each specimen surface measures 15 points, draws the final hardness value of mean value as this group sample often organizing sample hardness value.

Normal temperature tension specimen is according to the regulation of GB6397-86, and by wire cutting machine processing preparation, tensile test specimen shape and size as shown in Figure 1.The original gauge length 50mm of sample, breaking rear specimen length precision is that the vernier callipers of 0.02mm is measured.At room temperature, electronic universal tester is used to carry out tension test.

The deep cold rolling of the impact of annealing temperature on sample macrohardness (CR) and room temperature rolling (RT) changes in hardness of sample after different annealing temperature process afterwards, wherein annealing temperature and Vickers' hardness relation curve are as shown in Figure 1.No matter be room temperature rolling or deep cooling rolling, all there is identical variation tendency between hardness with annealing temperature, with the rising of annealing temperature, sample hardness first raises rear reduction, occurs peak value at about 180 DEG C.When annealing temperature is 150 DEG C, form GP district, precipitate particles, as the obstacle of dislocation motion, causes sample hardness value to increase; When annealing temperature is 175 DEG C, form β phase, compared with other middle precipitated phase, β phase is the hardest phase, and therefore when annealing temperature is higher than 175 DEG C, hardness value increases again to some extent.When temperature is higher than 180 DEG C, due to the generation of recrystallize, make lowered hardness.Under identical annealing temperature, through the sample hardness value of deep cooling rolling higher than the sample of room temperature rolling, its major cause is: deep cooling rolling changes the distribution of Mg2Si, becomes relative Dispersed precipitate, thus improve hardness value from dense distribution.Because deep cooling rolling can suppress the dynamic recovery of depressing greatly in the operation of rolling effectively, make to roll rear crystal grain more tiny, thus make the distribution of Mg2Si than room temperature rolling more evenly therefore under identical annealing temperature, the hardness value of deep cooling rolling sample is higher.

Annealing temperature is on the impact of sample microtexture

Fig. 2 is the metallographic structure under deep cooling rolling 6061 aluminium alloy different annealing temperature.Can find out, obviously elongate along rolling direction without crystal grain in the weave construction of anneal, form the fibrous tissue with the similar strip of low aspect ratio, this is that most of crystal grain no longer keeps original shape, and lattice distortion is serious due to after deep cooling rolling, crystal grain is elongated, dislocation desity increases, along rolling direction arrangement, in obvious stratiform.When 100 DEG C and 150 DEG C carry out anneal, the microtexture of sample is uneven, and some of them region demonstrates elongated stratiform ultra-fine grained structure, and other region stratiform fibrous tissue disappear.When 200 DEG C of annealing, in many regions, equi-axed crystal starts forming core, but also can observe elongated crystal grain in some places simultaneously.When carrying out anneal for 250 DEG C, portion crystal alligatoring.300 DEG C of annealing, grain coarsening is serious.When annealing temperature is 100 ~ 200 DEG C, reply, cause the remarkable minimizing of dislocation desity, some dislocation motions also complete a business transaction formation subgrain mutually.250 ~ 300 DEG C of annealing, there is grain coarsening, the excrescent reason of crystal grain is due to without the structural unstable high-angle boundary that there is low ratio in the deep cooling rolled sample of anneal, only have when the high-angle boundary in deformed sample is higher than 70%, abnormal grain coarsening and discontinuous recrystallize could be suppressed in annealing process subsequently to occur.

No matter (1) 6061 aluminium alloy is deep cooling rolling or room temperature rolling, and with the rising of annealing temperature, sample hardness first raises rear reduction, reaches maximum value about 180 DEG C hardness.

(2) deep cooling rolling 6061 aluminium alloy is when low-temperature annealing, and elongation exists two peak values.When temperature is 100 ~ 180 DEG C, elongation increases, and when temperature is 180 ~ 200 DEG C, elongation falls.

Claims

1. one kind is improved the preparation technology of 6061 aluminium alloy capabilities, it is characterized in that: comprise following steps: first raw material base is heated in resistance furnace 470 DEG C of insulation 2h, by multistage hot deformation to thick 3.3mm, as the raw material of rolling contrast experiment, subsequently thin plate is carried out solution treatment, sample through solution treatment is carried out room temperature rolling and deep cooling rolling respectively, two kinds of equal rolling passes of rolling method, total deformation is 50-80%, wherein in the deep cooling operation of rolling, sample is all placed on immersion 10 ~ 15min in liquid nitrogen by every time before rolling, sample after room temperature rolling and deep cooling rolling is carried out short annealing process at 100-250 DEG C respectively, all 15min is incubated at each temperature, then air cooling is to room temperature.

2. the preparation technology of a kind of raising according to claim 1 6061 aluminium alloy capabilities, is characterized in that: comprehensive deflection is 80%.

3. the preparation technology of a kind of raising according to claim 1 6061 aluminium alloy capabilities, is characterized in that: returning temperature is fast: 180 DEG C.