CN106834980B - A kind of process for quenching reducing heat treatable aluminum alloy residual stress - Google Patents
A kind of process for quenching reducing heat treatable aluminum alloy residual stress Download PDFInfo
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- CN106834980B CN106834980B CN201710100862.5A CN201710100862A CN106834980B CN 106834980 B CN106834980 B CN 106834980B CN 201710100862 A CN201710100862 A CN 201710100862A CN 106834980 B CN106834980 B CN 106834980B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/008—Using a protective surface layer
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Abstract
The present invention relates to the process for quenching that its quenched residual stress is reduced while a kind of holding intensity of aluminum alloy, plasticity and conductivity, are suitable for heat treatable alloy, the aluminium alloy especially suitable for heat treatment.Belong to technical field of alloy thermal treatment.The method of the invention is that aluminum alloy surface is coated high temperature glue-line and metal foil layer before solid solution, and after solid solution, material is quenched under coated state.Present invention process is easy to operate, easy to implement, and residual stress eradicating efficacy is good and is suitable for the larger and complex-shaped part of size, is suitble to actual industrial production.
Description
Technical field
The present invention relates to reduce quenching for its quenched residual stress while a kind of holding intensity of aluminum alloy, plasticity and conductivity
Ignition method is suitable for heat treatable alloy, the aluminium alloy especially suitable for heat treatment.Belong to technical field of alloy thermal treatment.
Background technique
Heat treatable aluminum alloy can obtain excellent comprehensive performance after suitable heat treatment process.Quenching process is general
Occur after alloy solid solution processing, with big cooling rate come the solid solution effect that has obtained, to guarantee energy after artificial aging
Obtain good precipitating reinforcing effect.But the rate of quenching is bigger, the cooling rate between material surface and inside in the process
Gap is also bigger, also bigger so as to cause residual stress existing for material after quenching.This quenched residual stress is in size
It is particularly evident in biggish workpiece.The residual stress of material internal influences very big, biggish residual stress meeting to the performance of material
The rigidity and its stability for influencing structure, cause the variation of workpiece shapes size, meanwhile, the fatigue strength of structure resists high temperature
The performances such as creep cracking and stress corrosion resistant also will receive influence.
The presence of residual stress makes material internal be in unstable distortion of lattice state.The elimination applied at present is remaining
The method of stress is mostly in principle to make dislocation motion, residual stress relaxation by additional condition, is such as applied external
Load, it is superimposed with the residual stress that is present in workpiece, it is plastically deformed more than material yield strength, residual stress pine
It relaxes and is released.The more most widely used quenched residual stress method that reduces or eliminates uses raising in industrial production at present
Hardening media temperature uses Polymer Aqueous Solution etc. and various ageing treatments and mechanical processing method such as heat aging method, vibration
The dynamic statutes of limitations and pre-stretching etc., but the reduction amplitude of residual stress usually below 60% Shi Caineng so that alloy is kept preferable
Mechanical property.
In conclusion there is still a need for new effective methods for this field can significantly drop under the premise of guaranteeing aluminium alloy capability
Low quenched residual stress.
Summary of the invention
It is an object of the invention to overcome the deficiency of the prior art and provide it is a kind of can be effectively reduced aluminum alloy quenching remnants
Stress and the process for quenching for keeping excellent performance.
A kind of process for quenching for reducing heat treatable aluminum alloy residual stress of the present invention, is before solid solution by aluminum alloy surface
High temperature glue-line and metal foil layer are coated, after solid solution, material is quenched under coated state.
A kind of process for quenching for reducing heat treatable aluminum alloy residual stress of the present invention, the high temperature glue-line and metal coated
Overall thickness≤2mm of layers of foil, preferably 0.5-2mm, further preferably 1-2mm.
The present invention it is a kind of reduce heat treatable aluminum alloy residual stress process for quenching, high temperature glue-line with a thickness of 0.1-
1.5mm。
A kind of process for quenching for reducing heat treatable aluminum alloy residual stress of the present invention, it is inorganic resistance to for coating high-temp glue used
High-temp glue.Preferably inorganic high-temperature resistant glue is DB5010 one pack system superhigh temperature inorganic glue.The decomposition temperature of the high-temp glue is higher than
The solid solubility temperature of aluminium alloy, and be dissolved in hardening media (oil, water, quenching liquid etc.).
A kind of process for quenching for reducing heat treatable aluminum alloy residual stress of the present invention, the DB5010 one pack system superhigh temperature
Inorganic glue is double bond chemistry DB5010 one-component superhigh temperature inorganic glue.This glue is resistant to 1200 DEG C of high temperature, acid and alkali resistance, oil but intolerant to
Boiling water.
A kind of process for quenching for reducing heat treatable aluminum alloy residual stress of the present invention, is aided with ageing treatment after quenching.
The ageing treatment is preferably artificial aging.The artificial aging includes single-stage artificial aging and multistage artificial aging.
A kind of process for quenching for reducing heat treatable aluminum alloy residual stress of the present invention, the method are suitable for be heat-treated
At least one of aluminium alloy, including 2XXX, 6XXX and 7XXX line aluminium alloy.
Preferably, a kind of process for quenching for reducing heat treatable aluminum alloy residual stress of the present invention, the aluminium close
The thickness at the most thin position of gold is more than or equal to 6mm.
Preferably, a kind of process for quenching for reducing heat treatable aluminum alloy residual stress of the present invention, the alloy
When for aluminium alloy, the material of metal foil layer used is aluminium foil.
Preferably, a kind of process for quenching for reducing heat treatable aluminum alloy residual stress of the present invention, the single-stage
The temperature of artificial aging is 100-180 DEG C, soaking time 12-24h.
A kind of process for quenching for reducing heat treatable aluminum alloy residual stress of the present invention, quenched residual stress can obtain after processing
100% decline must be for up to.
A kind of process for quenching for reducing heat treatable aluminum alloy residual stress of the present invention, the high temperature glue-line and metal coated
Layers of foil is quenched rear peelable.
A kind of process for quenching for reducing heat treatable aluminum alloy residual stress of the present invention, products obtained therefrom and existing skill after quenching
The performance of products obtained therefrom remains basically stable after art quenching, such as intensity, plasticity and the conductivity of alloy.Wherein conductivity even also
It is certain to improve.
Principle and advantage
Quenched residual stress is generated with internal cooling rate there are larger difference due to material surface, and surface is cooling
Rate is maximum, therefore the deformation of material is the most violent with surface in quenching process.Meanwhile material surface residual compressive stress.The present invention
It proposes before solid solution and quenching, aluminum alloy surface is coated into certain thickness high-temp glue and one layer of aluminium foil, in quenching process most
Outer layer deforms part the most violent and has been transferred on high-temp glue and aluminium foil.Point of usual material quenching rear surface residual compressive stress
For cloth from successively decreasing inwards outside, center portion is residual tension.Therefore, after high-temp glue cladding quenching treatment, material surface remnants are answered
Power level can reduce much compared to traditional sample；And severe degree is deformed by the surface that high-temp glue and aluminium foil coat after quenching
Not as good as traditional sample, therefore the former hardened face quality can accordingly obtain some improvement.
Most widely used traditional method for removing residual stress has heat aging method, Vibration aging facture etc. in production at present, and one
As in the case of, the eradicating efficacy of both technique residual stress is below 60%.Using cladding quenching technical of the present invention,
It can significantly reduce material quenched residual stress.When quenching process high-temp glue and aluminium foil single side always coat thickness and reach 0.5mm, quenching
Residual stress fall just can reach 75% or more；When cladding thickness reaches 1.0mm-1.5mm, aluminum alloy surface residual stress
It is horizontal very low；When cladding thickness reaches 2mm, aluminum alloy surface changes via compression for tensile stress.It can be seen that
It can achieve the effect that in contrast to traditional method for removing residual stress such as heat aging method, Vibration aging facture etc., high-temp glue cladding is quenched
Fiery processing method has the effect become apparent to the elimination of aluminum alloy surface quenched residual stress.
Present invention process is easy to operate, easy to implement, and residual stress eradicating efficacy is good and is suitable for that size is larger and shape
Complex Parts are suitble to actual industrial production.
Detailed description of the invention
Attached drawing 1 is 1 sample pretreating schematic diagram of embodiment；
Attached drawing 2 is the tensile stress-strain curve figure of the cladding of embodiment 1 processing sample and uncoated processing sample；
Fig. 1 (a) is cladding treated sample in attached drawing 1, and Fig. 1 (b) is sample with no treatment.
In Fig. 2, No. 1 curve is the tensile stress-strain curve of the cladding processing Sample A of embodiment 1；No. 2 curves are not make
The tensile stress-strain curve of the Sample A of any processing, as can be seen from Figure 2: sample (Sample A) yield strength, tension are strong
Degree and elongation after fracture can keep same level with normal quenching+artificial aging processing sample (sample B).
Specific embodiment
Embodiment 1
A kind of quenching mode reducing aluminum alloy quenching residual stress.The following steps are included:
1. sampling.Sample is 7150 aluminum alloy plate materials of 80mm × 40mm × 10mm shape specification.Two samples are taken, are numbered
For A and B.
2. cladding is handled.After sample A is cleaned out, high-temp glue is coated in a face 80mm × 40mm, then uses aluminium foil
It coats and gently smooths on surface, single side always coats with a thickness of 1.5mm after high-temp glue solidification.Sample is placed in electric heating forced air drying
Case, the face-up placement wrapped up, 90 DEG C at a temperature of keep the temperature 1h, complete the preliminary solidification of high-temp glue.Then other five
A face is coated with the high-temp glue with first face same thickness, is wrapped up and is smoothed with aluminium foil, then sample merging electric heating air blast is done
Dry case is warming up to 150 DEG C and continues to keep the temperature 1h after 90 DEG C of heat preservation 1h.After the completion of heat preservation, Sample A is taken out, it is cold in air
But.Sample B is with no treatment.As shown in Figure 1.The high-temp glue is that commercially available double bond chemistry DB5010 one pack system superhigh temperature is inorganic
Glue.
It is dissolved 3. Sample A and sample B are separately heated to 475 DEG C, soaking time 1.5h is then quenched.
4. pair specimen surface (mainly Sample A surface) is cleared up, the surface coated high-temp glue of Sample A and aluminium foil are being quenched
It can easily peel off after fire, and the glue of still adhesion can be removed with boiling water.Sample A and B are measured respectively using boring method after cleaning out
Residual stress, as a result as shown in table 1 and Fig. 2.
The comparison of 1 sample performance of table
The calculation method of the residual stress range of decrease is in table 1；Residual stress after residual stress/B processing after A processing.
5. Sample A and B are carried out artificial aging, institution of prescription is 120 DEG C, keeps the temperature 15h.A and B is carried out after the completion of processing
Vickers hardness, the test of conductivity and stretching experiment.Vickers hardness and conductivity test result are shown in the table 1, stretching experiment
Obtained engineering stress strain curve is as shown in Figure 2.
As it can be seen from table 1 comparison does not have to the sample of high-temp glue and aluminium foil cladding processing, after being quenched using present invention process
Sample (Sample A), quenched residual stress is greatly lowered, the decreasing value of transverse direction and rolling residual stress all 90% with
On.After artificial aging, higher hardness number is not only still remain using the sample that present invention process is handled, conductivity also obtains
A degree of improvement is arrived.From the engineering stress strain curve that stretching experiment obtains, it can be seen that use present invention process
Sample (Sample A) yield strength, tensile strength and the elongation after fracture of processing can be with normal quenching+artificial aging processing
Sample (sample B) keeps same level.It can be seen that present invention process can be protected while reducing aluminum alloy quenching residual stress
Hold the performance of material.
Embodiment 2
1. taking 2024 aluminum alloy plate materials sample of 120mm × 120mm × 25mm shape specification, number C.
2. half cladding is handled.By the larger face (face 120mm × 120mm) of C sample and surrounding four 120mm ×
25mm bread covers high-temp glue and aluminium foil, always coats after high-temp glue solidification with a thickness of 1mm.Do not make in another face 120mm × 120mm
Processing.
3. heating sample C to 495 DEG C is dissolved, quenched after soaking time 2h.Sample C two are then measured respectively
The residual stress in the face 120mm × 120mm, the results are shown in Table 2.
4. sample C is carried out artificial aging, institution of prescription is 190 DEG C, keeps the temperature 12h.Hardness survey is carried out to C after the completion of processing
Amount, the results are shown in Table 2.
2 sample different sides performance comparison of table
Cladding face and uncoated face performance by control sample C, it will thus be seen that cladding is handled using present invention process
Face, the more uncoated face of residual stress level reduces 80%~85%, and hardness remains to be maintained.
Claims (8)
1. a kind of process for quenching for reducing heat treatable aluminum alloy residual stress, it is characterised in that: the method is before solid solution
Aluminum alloy surface is coated into high temperature glue-line and metal foil layer, after solid solution, material is quenched under coated state；The height coated
The overall thickness of warm glue-line and metal foil layer is 0.5-2mm.
2. a kind of process for quenching for reducing heat treatable aluminum alloy residual stress according to claim 1, it is characterised in that:
High temperature glue-line with a thickness of 0.1-1.5mm.
3. a kind of process for quenching for reducing heat treatable aluminum alloy residual stress according to claim 1, it is characterised in that:
Coating high-temp glue used is inorganic high-temperature resistant glue.
4. a kind of process for quenching for reducing heat treatable aluminum alloy residual stress according to claim 1, it is characterised in that:
It is aided with ageing treatment after quenching.
5. a kind of process for quenching for reducing heat treatable aluminum alloy residual stress according to any one of claims 1-4,
It is characterized by: the aluminium alloy includes 2XXX, 4XXX, 6XXX and 7XXX line aluminium alloy.
6. a kind of process for quenching for reducing heat treatable aluminum alloy residual stress according to claim 1, it is characterised in that:
The thickness at the most thin position of the aluminium alloy is more than or equal to 6mm；
The material of the metal foil layer is aluminium foil.
7. a kind of process for quenching for reducing heat treatable aluminum alloy residual stress according to claim 4, it is characterised in that:
The ageing treatment is single-stage artificial aging；The temperature of the single-stage artificial aging is 100-180 DEG C, soaking time 12-
24h。
8. a kind of process for quenching for reducing heat treatable aluminum alloy residual stress according to any one of claims 1-4,
It is characterized by: quenched residual stress can obtain for up to 100% decline.
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| CN107641779A (en) * | 2017-11-14 | 2018-01-30 | 中铝东南材料院（福建）科技有限公司 | 7 line aluminium alloys for CNC processing improve the Technology for Heating Processing of residual stress |
| CN108531836B (en) * | 2018-05-09 | 2019-12-20 | 湖南人文科技学院 | Heat treatment technology for preparing high-performance low-residual-stress aluminum alloy |
| CN108588349A (en) * | 2018-06-29 | 2018-09-28 | 上海建桥学院 | A kind of impewdance matching compensation device |
| CN113249600A (en) * | 2021-05-17 | 2021-08-13 | 安徽力幕新材料科技有限公司 | High-toughness aluminum alloy manufacturing method and impurity and slag removing method |
| CN115305421B (en) * | 2022-07-25 | 2023-10-27 | 中南大学 | Thermal vibration aging method and device for regulating and controlling residual stress and performance of high-strength aluminum alloy |
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