CN104674231A - Aluminum alloy and surface reinforcing method of composite material of aluminum alloy - Google Patents
Aluminum alloy and surface reinforcing method of composite material of aluminum alloy Download PDFInfo
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- CN104674231A CN104674231A CN201310629089.3A CN201310629089A CN104674231A CN 104674231 A CN104674231 A CN 104674231A CN 201310629089 A CN201310629089 A CN 201310629089A CN 104674231 A CN104674231 A CN 104674231A
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Abstract
The invention relates to an aluminum alloy and a surface reinforcing method of a composite material of the aluminum alloy and belongs to the technical field of metal surface strengthening. The method comprises the following steps: firstly sandblasting the aluminum alloy and the parts made from the composite material to clean of a surface lubricant, polluting impurities and folding defects, wherein the sand grain size is 70-200 microns; secondarily carrying out corrosion treatment on the aluminum alloy and the parts made from the composite material, specifically, firstly soaking the aluminum alloy and the parts made from the composite material in a sodium hydroxide aqueous solution, then washing with clean water, then soaking in a nitric acid solution and washing by clean water, and finally airing to remove the surface sandblasting traces; and finally, sandblasting the aluminum alloy and the parts made from the composite material to form a pressure stress layer, wherein the shots are spherical glass shots the grain size of which is 70-200 microns. According to the aluminum alloy and the parts made from the composite material treated by the method, the mechanical properties such as the anti-fatigue performance, the wear-resisting performance and the like of the material can be remarkably improved.
Description
Technical field
The invention belongs to metal surface enhanced technical field, particularly the surface reinforcing method of a kind of aluminium alloy and matrix material thereof.
Background technology
Aluminium alloy and matrix material thereof have that density is little, specific tenacity is high, specific rigidity is high, antifatigue and the premium properties such as creep property is good, corrosion-resistant, often as the lightweight structure materials application of first-selection in the field such as aerospace, automotive industry.
Shot peening strengthening is a kind of important means that effectively can improve component anti-fatigue performance, and it can form a residual compressive stress layer in metallic surface, can prevent the initiation and propogation with delay fatigue crackle, improves the fatigue lifetime of component.Surface compress residual stresses can also make component wear resisting property strengthen in addition, effectively can prevent stress corrosion, improves its corrosion fatigue life.
Aluminium alloy and matrix material thereof are as a kind of aerospace key construction part, and its surface quality is very responsive on its fatigue lifetime of impact.Traditional method for surface hardening is only that the component through plastic making are directly carried out shot peening, the middle process without any link.But in fact component terminate rear surface in plastic making and can remain a lot of lubricant (as graphite etc.), and other impurity (as iron filings etc.) introduced in plastic making link, if component are complex-shaped, the forging defects such as a lot of folding, pit may be produced, above-mentioned defect struchures cannot be removed completely by means of only single shot peening, even some impurity can be compressed into forging top layer, for the germinating of fatigue cracking provides supremacy clause, the fatigue lifetime of forging can decrease.Therefore, obtain a cleaning, have the surface strengthen layer of residual compressive stress particularly important.
Summary of the invention
The object of the present invention is to provide the surface reinforcing method of a kind of aluminium alloy and composite material parts thereof, this surface reinforcing method strengthening layer is cleaner, cost is low, production efficiency is high, can significantly improve the mechanical propertys such as the anti-fatigue performance of material, wear resisting property.
A surface reinforcing method for aluminium alloy and composite material parts thereof, comprises the steps:
(1) carry out sandblasting to aluminium alloy and composite material parts thereof, sand particle diameter is 70 ~ 200 μm, cleaning surface lubricant, pollution impurity and fold defect etc.;
(2) carry out corrosion treatment to aluminium alloy and composite material parts thereof, first put into aqueous sodium hydroxide solution and soak, then clear water rinses, then puts into salpeter solution and soak, and clear water rinses, and finally dries up, and removes surface sand-blasting vestige:
(3) carry out shot peening to aluminium alloy and composite material parts thereof, bullet adopts spherical glass ball, and particle diameter is 70 ~ 200 μm, forms compressive stress layer.
For load assembly, component surface quality can remarkably influenced its fatigue lifetime, surface quality is good, exist stress strengthening layer then its fatigue lifetime longer, so obtain a cleaning, have the surface strengthen layer of residual compressive stress particularly important.
In the present invention, first sandblasting is carried out to aluminium alloy and composite material parts thereof, utilize the good cutting power of sand to clear up and introduce surperficial lubricant, pollution impurity or fold defect etc. in the plastic making stage, sand particle diameter is 70 ~ 200 μm, jet length is 10 ~ 40cm, gaseous tension 0.2 ~ 1MPa, the sand cutting power that particle diameter is too little or too large is poor, sandblasting efficiency is low.
Then, corrosion treatment is carried out to aluminium alloy and composite material parts thereof, first put into the aqueous sodium hydroxide solution that mass concentration is 10% ~ 20%, temperature is 50 ~ 80 DEG C to soak, soak time is that after 5 ~ 15min, clear water rinses, then put into the salpeter solution that mass concentration is 5% ~ 10%, temperature is room temperature to soak, soak time is that after 1 ~ 3min, clear water rinses, then dries up; Remove surface sand-blasting vestige.After sandblasting, material surface can produce the short cut (see Fig. 2 (a)) that a lot of sand stays, this surface is very beneficial for fatigue crack initiation, greatly can reduce the work-ing life of component, so adopt sodium hydroxide solution cheap, simple to operate to be corroded removing, adopt sodium hydroxide solution in salpeter solution and residual again, the surface that final acquisition one is smooth, clean.
Finally, carry out shot peening to aluminium alloy and composite material parts thereof, produce a clean compressive stress layer, bullet selects spherical glass ball, and particle diameter is 70 ~ 200 μm, and jet length is 10 ~ 40cm, gaseous tension 0.2 ~ 1MPa.
Surface reinforcing method of the present invention can be widely used in foundry goods and the stamp work of 2XXX system and 6XXX line aluminium alloy and matrix material thereof.
The advantage of the surface reinforcing method of aluminium alloy of the present invention and composite material parts thereof is: the method cost is low, production efficiency is high, the surface strengthen layer that can obtain a cleaning, have residual compressive stress, have the advantages that strengthening layer is cleaner, cost is low and production efficiency is high, the mechanical propertys such as the anti-fatigue performance of material, wear resisting property can be significantly improved.
Below by embodiment and accompanying drawing, the present invention will be further described, but do not mean that limiting the scope of the invention.
Accompanying drawing explanation
Fig. 1 is the surface intensified technique general flow chart of aluminium alloy and composite material parts thereof.
Fig. 2 (a) is 15vol.%SiC
pmicrostructure picture (Hitachi S-4800 type cold field emission scanning electron microscope, amplifies 400 times) after the sandblasting of/2009Al matrix material forging.
Fig. 2 (b) is 15vol.%SiC
pmicrostructure picture (Hitachi S-4800 type cold field emission scanning electron microscope, amplifies 400 times) after the corrosion of/2009Al matrix material forging.
Fig. 2 (c) is 15vol.%SiC
pmicrostructure picture (Hitachi S-4800 type cold field emission scanning electron microscope, amplifies 400 times) after/2009Al matrix material forging shot-peening.
Embodiment
As shown in Figure 1, for the surface intensified technique flow process of aluminium alloy of the present invention and composite material parts thereof is simple, comprise and sandblasting is carried out to component, corrosion treatment and shot peening three steps.First sandblasting is carried out to aluminium alloy and composite material parts thereof, utilize the good cutting power of sand to clear up surface lubricant, to pollute impurity or fold defect etc.; Then carry out corrosion treatment, remove surface sand-blasting vestige; Finally carry out shot peening, make material surface produce a clean compressive stress layer, thus significantly improve the mechanical property such as anti-fatigue performance, wear resisting property of material.
Embodiment 1:
The experiment material of the present embodiment is 15vol.%SiC
p/ 2009Al matrix material forging.Specific implementation method: the first step, carries out sandblasting to matrix material forging, cleaning surface lubricant, pollution impurity or fold defect etc., and sand particle diameter is 150 μm, and jet length is 10cm, gaseous tension 1MPa; Second step, corrosion treatment is carried out to matrix material forging, remove surface sand-blasting vestige: first put into mass concentration is 10%, temperature is 70 DEG C aqueous sodium hydroxide solution soak 10min after clear water rinse, then put into mass concentration is 5%, temperature is room temperature salpeter solution soak 3min after clear water rinse, then to dry up; 3rd step, carries out shot peening to matrix material forging, and produce compressive stress layer, bullet selects spherical glass ball, and particle diameter is 70 μm, and jet length is 20cm, gaseous tension 1MPa.
Fig. 2 is 15vol.%SiC
p/ 2009Al matrix material is forging surface microscopic tissue after sandblasting, after sandblasting (Fig. 2 (a)), forging surface has been covered with short cut, and these cuts bring disadvantageous effect, so must be removed can to forging fatigue property.After sodium hydroxide solution corrosion (Fig. 2 (b)), the residual short cut of sandblasting cleaned fall, forging smooth surface, has one deck SiC particle outside exposed.After shot peening (Fig. 2 (c)), exposed SiC particle is knocked and comes off, and produces form the uniform ball hole of one deck on forging surface.After tested, before shot-peening, forging hardness is 160HB, is 180HB, improves 12.5% after shot-peening.Draw-pulling shaft shows to Fatigue Test, when loading stress is 380MPa, the circulation cycle of material is by 2 × 10 before shot-peening
5be increased to 3 × 10
6.
Embodiment 2:
The experiment material of the present embodiment is 2024Al sheet material.Specific implementation method: the first step, carries out sandblasting to 2024Al sheet material, cleaning surface lubricant, pollution impurity or fold defect etc., and sand particle diameter is 100 μm, and jet length is 20cm, gaseous tension 0.5MPa; Second step, corrosion treatment is carried out to 2024Al sheet material, remove surface sand-blasting vestige: first put into mass concentration is 15%, temperature is 60 DEG C aqueous sodium hydroxide solution soak 5min after clear water rinse, then put into mass concentration is 10%, temperature is room temperature salpeter solution soak 1min after clear water rinse, then to dry up; 3rd step, carries out shot peening to 2024Al sheet material, and produce compressive stress layer, bullet selects spherical glass ball, and particle diameter is 150 μm, and jet length is 40cm, gaseous tension 0.5MPa.After tested, before shot-peening, material hardness is 125HB, is 140HB, improves 12% after shot-peening.Draw-pulling shaft shows to Fatigue Test, when loading stress is 300MPa, the circulation cycle of material is by 5 × 10 before shot-peening
5be increased to 1 × 10
6.
Embodiment 3:
The experiment material of the present embodiment is 6061Al bar.Specific implementation method: the first step, carries out sandblasting to 6061Al bar, cleaning surface lubricant, pollution impurity or fold defect etc., and sand particle diameter is 200 μm, and jet length is 30cm, gaseous tension 0.2MPa; Second step, corrosion treatment is carried out to 6061Al bar, remove surface sand-blasting vestige: first put into mass concentration is 20%, temperature is 50 DEG C aqueous sodium hydroxide solution soak 5min after clear water rinse, then put into mass concentration is 10%, temperature is room temperature salpeter solution soak 2min after clear water rinse, then to dry up; 3rd step, carries out shot peening to 6061Al bar, and produce compressive stress layer, bullet selects spherical glass ball, and particle diameter is 200 μm, and jet length is 30cm, gaseous tension 0.2MPa.After tested, before shot-peening, Tensile strength is 240MPa, is 260MPa after shot-peening.Draw-pulling shaft shows to Fatigue Test, when loading stress is 120MPa, the circulation cycle of material is by 7 × 10 before shot-peening
4be increased to 8 × 10
5.
Cost of the present invention is low, production efficiency is high, can obtain a cleaning, have the surface strengthen layer of residual compressive stress, can significantly improve the mechanical propertys such as the anti-fatigue performance of material, wear resisting property.
Claims (5)
1. a surface reinforcing method for aluminium alloy and composite material parts thereof, comprises the steps:
(1) carry out sandblasting to aluminium alloy and composite material parts thereof, sand particle diameter is 70 ~ 200 μm, cleaning surface lubricant, pollution impurity and fold defect;
(2) carry out corrosion treatment to aluminium alloy and composite material parts thereof, first put into aqueous sodium hydroxide solution and soak, then clear water rinses, then puts into salpeter solution and soak, and clear water rinses, and finally dries up, and removes surface sand-blasting vestige:
(3) carry out shot peening to aluminium alloy and composite material parts thereof, bullet adopts spherical glass ball, and particle diameter is 70 ~ 200 μm, forms compressive stress layer.
2. the surface reinforcing method of aluminium alloy according to claim 1 and composite material parts thereof, is characterized in that: in described sandblasting, and jet length is 10 ~ 40cm, gaseous tension 0.2 ~ 1MPa.
3. the surface reinforcing method of aluminium alloy according to claim 1 and composite material parts thereof, is characterized in that: the mass concentration of described aqueous sodium hydroxide solution is 10% ~ 20%, and temperature is 50 ~ 80 DEG C, and soak time is 5 ~ 15min.
4. the surface reinforcing method of aluminium alloy according to claim 1 and composite material parts thereof, is characterized in that: the mass concentration of described salpeter solution is 5% ~ 10%, and soak time is 1 ~ 3min.
5. the surface reinforcing method of aluminium alloy according to claim 1 and composite material parts thereof, is characterized in that: in described shot peening, and jet length is 10 ~ 40cm, gaseous tension 0.2 ~ 1MPa.
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Cited By (5)
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| CN110453054A (en) * | 2018-05-07 | 2019-11-15 | 南京晶质新型复合材料科技有限公司 | A kind of nanocomposite steel substrate surface processing method |
| CN111136588A (en) * | 2018-11-06 | 2020-05-12 | 有研工程技术研究院有限公司 | Method for improving surface quality of aluminum matrix composite |
| CN113936906A (en) * | 2021-09-30 | 2022-01-14 | 安徽瑞德磁电科技有限公司 | Sphericizing preparation method of broken iron-silicon-aluminum magnetic powder particles |
| CN116005049A (en) * | 2023-01-06 | 2023-04-25 | 山东国泰铝业有限公司 | Corrosion-resistant aluminum alloy profile and preparation method thereof |
| CN116162873A (en) * | 2023-04-26 | 2023-05-26 | 中北大学 | 2024 aluminum alloy and surface treatment method thereof |
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| CN113936906A (en) * | 2021-09-30 | 2022-01-14 | 安徽瑞德磁电科技有限公司 | Sphericizing preparation method of broken iron-silicon-aluminum magnetic powder particles |
| CN113936906B (en) * | 2021-09-30 | 2023-08-11 | 安徽瑞德磁电科技有限公司 | Sphericizing preparation method of broken sendust magnetic powder particles |
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| CN116162873A (en) * | 2023-04-26 | 2023-05-26 | 中北大学 | 2024 aluminum alloy and surface treatment method thereof |
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Effective date of registration: 20210602 Address after: 101407 No.11, Xingke East Street, Yanqi Economic and Technological Development Zone, Huairou District, Beijing Patentee after: Youyan metal composite technology Co.,Ltd. Address before: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee before: YOUYAN ENGINEERING TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |