CN114686734A - High-ductility soluble aluminum alloy, preparation method and application - Google Patents
High-ductility soluble aluminum alloy, preparation method and application Download PDFInfo
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- CN114686734A CN114686734A CN202210404063.8A CN202210404063A CN114686734A CN 114686734 A CN114686734 A CN 114686734A CN 202210404063 A CN202210404063 A CN 202210404063A CN 114686734 A CN114686734 A CN 114686734A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 239000000956 alloy Substances 0.000 claims abstract description 55
- 239000012535 impurity Substances 0.000 claims abstract description 38
- 238000005266 casting Methods 0.000 claims abstract description 18
- 230000032683 aging Effects 0.000 claims abstract description 12
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- 229910052733 gallium Inorganic materials 0.000 claims abstract description 8
- 238000001192 hot extrusion Methods 0.000 claims abstract description 8
- 229910052738 indium Inorganic materials 0.000 claims abstract description 8
- 229910052718 tin Inorganic materials 0.000 claims abstract description 8
- 239000003079 shale oil Substances 0.000 claims abstract description 7
- 238000000265 homogenisation Methods 0.000 claims abstract description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 48
- 239000003795 chemical substances by application Substances 0.000 claims description 36
- 239000000155 melt Substances 0.000 claims description 26
- 229910052782 aluminium Inorganic materials 0.000 claims description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 23
- 238000001125 extrusion Methods 0.000 claims description 19
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 18
- 239000002893 slag Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 13
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 12
- 229910017888 Cu—P Inorganic materials 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000001103 potassium chloride Substances 0.000 claims description 9
- 235000011164 potassium chloride Nutrition 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 9
- 238000010309 melting process Methods 0.000 claims description 7
- 229910018117 Al-In Inorganic materials 0.000 claims description 6
- 229910018134 Al-Mg Inorganic materials 0.000 claims description 6
- 229910018140 Al-Sn Inorganic materials 0.000 claims description 6
- 229910018229 Al—Ga Inorganic materials 0.000 claims description 6
- 229910018456 Al—In Inorganic materials 0.000 claims description 6
- 229910018467 Al—Mg Inorganic materials 0.000 claims description 6
- 229910018564 Al—Sn Inorganic materials 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- 235000002639 sodium chloride Nutrition 0.000 claims description 6
- 239000011775 sodium fluoride Substances 0.000 claims description 6
- 235000013024 sodium fluoride Nutrition 0.000 claims description 6
- -1 aluminum-titanium-boron Chemical group 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 description 9
- 238000004090 dissolution Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- 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
- C22F1/047—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 of alloys with magnesium as the next major constituent
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/08—Down-hole devices using materials which decompose under well-bore conditions
Abstract
The invention discloses a high-ductility soluble aluminum alloy, a preparation method and application thereof, wherein the aluminum alloy comprises the following elements in percentage by weight: mg 1.5 wt%, Ga 1 wt%, In 0.7 wt%, Sn 1 wt%, and the balance of Al and inevitable impurity elements. The soluble aluminum alloy is obtained by carrying out homogenization treatment, hot extrusion treatment and aging treatment on the components after smelting and ingot casting. The soluble aluminum alloy material can be used as a material of a fracturing tool for shale oil and gas exploitation. The soluble aluminum alloy prepared by the invention has high ductility, good toughness, high strength, solubility and controllable solubility.
Description
Technical Field
The invention belongs to the technical field of alloy preparation, and particularly relates to a high-ductility soluble aluminum alloy, a preparation method and application thereof.
Background
The aluminum alloy has rich yield, low density, high specific strength, excellent conductivity, heat conductivity, corrosion resistance and other features, and may be produced into various shapes. The method is widely applied to the fields of aviation, aerospace, automobiles, mechanical manufacturing, ships and the like.
70% of oil and gas reserves in China are low-permeability unconventional energy sources, wherein the reserves of shale gas and shale oil are in the forefront of the world, and because the exploitation of the shale gas and the shale oil is relatively difficult, the development of the unconventional oil and gas resources at present needs to depend on technologies such as hydraulic fracturing. In the underground separate-layer staged fracturing, the interval needs to be sealed, and after the operation is finished, the temporary plugging tool needs to be removed. Most of the traditional temporary plugging tools are made of steel, and have the defects of difficult drilling and milling, long time consumption, difficult flowback of fragments after drilling and grinding and the like. The tool made of the soluble aluminum alloy material can be automatically dissolved in the underground environment after the operation is finished, the manual drilling and grinding and recovery processes are omitted, the engineering risk is reduced, and the construction efficiency is improved.
When the traditional soluble aluminum alloy is used at certain temperature or in a downhole environment with larger bearing capacity, the ductility, the strength, the toughness and other mechanical properties of the traditional soluble aluminum alloy are reduced, the plasticity is poor, the deformation is small, the traditional soluble aluminum alloy is easy to break, and the application range of the traditional soluble aluminum alloy is limited. Therefore, the reasonable design of the element proportion and the process parameters of the high-ductility soluble aluminum alloy material is an important technical problem, the development of the high-ductility high-performance soluble aluminum alloy material is expected to be promoted by solving the problem, and the technical level of unconventional energy exploitation such as shale oil gas and the like in China is improved.
Disclosure of Invention
The invention aims to provide a soluble aluminum alloy with high ductility, a preparation method and application. The high-ductility soluble aluminum alloy material can be prepared by casting, heat treatment, extrusion and other modes, realizes the controlled degradation of the soluble aluminum alloy material in certain underground environments, and has better ductility and other mechanical properties and stable dissolution rate.
In order to achieve the purpose, the invention adopts the technical scheme that the high-ductility soluble aluminum alloy comprises the following elements in percentage by weight: mg 1.5 wt%, Ga 1 wt%, In 0.7 wt%, Sn 1 wt%, and the balance of Al and inevitable impurity elements.
Preferably, the high-ductility soluble aluminum alloy has a tensile strength of 260 to 380MPa and an elongation of 30 to 40%.
The invention also provides a preparation method of the high-ductility soluble aluminum alloy, which comprises the following steps:
step 1), weighing all elements according to the weight percentage ratio, introducing Mg by using Al-Mg intermediate alloy, introducing Ga by using Al-Ga intermediate alloy, introducing In by using Al-In intermediate alloy, introducing Sn by using Al-Sn intermediate alloy, and introducing Al which is insufficient by using pure aluminum ingot;
step 2), smelting and casting: smelting each intermediate alloy and pure aluminum ingot and then casting to obtain an ingot;
step 3) homogenizing treatment: heating the cast ingot and then preserving heat to ensure that the components of the cast ingot are uniformly distributed;
step 4), hot extrusion treatment: hot extruding the cast ingot to form a bar;
and 5) carrying out aging treatment.
Preferably, in the step 2), firstly, pure aluminum is melted, SF6+ CO2 gas is used for protection in the melting process, after the pure aluminum is completely melted, the temperature of the melt is raised to 730-.
Preferably, in the step 2), an impurity removing agent is added for removing impurities, wherein the impurity removing agent comprises sodium fluoride, sodium chloride and potassium chloride in a mass ratio of 1:1: 1; the addition amount of the impurity removing agent is 2-3% of the total mass of the melt.
Preferably, in the step 2), a slag removing agent is added for removing slag, the slag removing agent is an aluminum-titanium-boron wire, and the aluminum-titanium-boron wire comprises, by mass, 4.5-5.5% of Ti, 0.8-1.0% of B, and the balance of Al, wherein the contents of impurities: si is less than 0.20%, Fe is less than 0.30%, V is less than 0.25%, other elements are less than 0.03%, and the total content of impurity elements is less than 0.10%; the addition amount of the slag striking agent is 2-3% of the total mass of the melt.
Preferably, in the melting process of the step 2), a refiner is added to refine grains, wherein the refiner comprises the components of Cu-P master alloy and Al-Ti-B master alloy, and the proportion of the refiner is 0.35-0.45% of the Cu-P master alloy and 0.55-0.65% of the Al-Ti-B master alloy in percentage by weight. The addition of the refiner is 1 percent of the total mass of the melt.
Preferably, in the step 3), the heat preservation temperature of the homogenization treatment is 340-380 ℃ and the heat preservation time is 20-30 h.
Preferably, in the step 4), the extrusion temperature is 340-380 ℃, the extrusion speed is 0.5-2 mm/s, and the extrusion ratio is 15-20.
Preferably, in the step 5), the aging treatment temperature is 170-200 ℃, and the treatment time is 20-36 h.
The invention also provides application of the high-ductility soluble aluminum alloy in preparation of fracturing tools for shale oil and gas exploitation.
Compared with the traditional soluble aluminum alloy, the soluble aluminum alloy prepared by the invention has the following beneficial effects:
(1) the high-ductility soluble aluminum alloy can refine the grain size of the cast ingot by adding the elements Ga, In and Sn, reduces the segregation of the cast ingot, and ensures the refinement of the cast ingot structure and the stability of the solubility property to a certain extent. Meanwhile, a refiner is added to further refine the grain size of the cast ingot.
(2) Compared with a powder metallurgy method, the high-ductility soluble aluminum alloy disclosed by the invention is prepared by a fusion casting method, and internal pores of the material are eliminated, so that the mechanical property of the material is obviously improved.
(3) The high-ductility soluble aluminum alloy disclosed by the invention has the tensile strength of 260-380 MPa, the elongation of 30-40% and a good dissolution rate.
Detailed Description
The reagents or starting materials used in the present invention are commercially available, and if not otherwise specified, the reagents or starting materials used in the present invention are used in a manner conventional in the art or in accordance with the product specifications.
The high-ductility soluble aluminum alloy adopted by the invention comprises the following elements in percentage by weight: mg 1.5 wt%, Ga 1 wt%, In 0.7 wt%, Sn 1 wt%, and the balance of Al and inevitable impurity elements.
The preparation method of the high-ductility soluble aluminum alloy comprises the following steps:
step 1), weighing all elements according to the weight percentage ratio of all components of the soluble aluminum alloy, introducing Mg by using Al-Mg intermediate alloy, introducing Ga by using Al-Ga intermediate alloy, introducing In by using Al-In intermediate alloy, introducing Sn by using Al-Sn intermediate alloy, and introducing Al which is insufficient by using pure aluminum ingot;
step 2), smelting and casting: melting pure aluminum, using SF6+ CO2 gas for protection in the melting process, raising the temperature of the melt to 700-.
In the smelting process, an impurity removing agent is added for removing impurities, wherein the impurity removing agent comprises sodium fluoride, sodium chloride and potassium chloride in a mass ratio of 1:1: 1; the addition amount of the impurity removing agent is 2-3% of the total mass of the melt.
Adding a slag removing agent for removing slag, wherein the slag removing agent is an aluminum-titanium-boron wire which comprises the following components in percentage by mass of 4.5-5.5% of Ti, 0.8-1.0% of B and the balance of Al, wherein the impurities are as follows: si < 0.20%, Fe < 0.30%, V < 0.25%, other elements < 0.03%, and total content of impurity elements < 0.10%. The addition amount of the slag striking agent is 2-3% of the total mass of the melt.
Adding a refiner with the weight percentage of 1 percent of the total mass of the melt to refine the crystal grains, wherein the components of the refiner comprise Cu-P intermediate alloy and Al-Ti-B intermediate alloy, and the mixture ratio is 0.35-0.45 percent of the Cu-P intermediate alloy and 0.55-0.65 percent of the Al-Ti-B intermediate alloy in percentage by mass.
Step 3) homogenizing treatment: the heat preservation temperature is 340-380 ℃ and the heat preservation time is 20-30 h.
Step 4), hot extrusion treatment: the extrusion temperature is 340-380 ℃, the extrusion speed is 0.5-2 mm/s, the extrusion ratio is 15-20, and the cast ingot is made into a bar through hot extrusion.
Step 5), aging treatment is carried out: the treatment temperature is 170-200 ℃, and the treatment time is 20-36 h.
Hereinafter, some preferred embodiments will be described in detail.
Example 1
The high-ductility soluble aluminum alloy comprises the following elements in percentage by weight: mg 1.5 wt%, Ga 1 wt%, In 0.7 wt%, Sn 1 wt%, and the balance of Al and inevitable impurity elements.
The preparation method comprises the following steps:
step 1), weighing the raw materials according to the proportion: weighing pure aluminum ingot, Al-Mg intermediate alloy, Al-Ga intermediate alloy, Al-In intermediate alloy and Al-Sn intermediate alloy.
After the raw materials are weighed, the surfaces of the raw materials are polished by sand, and surface oxide layers are removed.
Step 2), smelting and casting: heating and melting pure aluminum in a graphite crucible, using SF6+ CO2 gas for protection in the melting process, heating the melt to 700 ℃ after the pure aluminum is completely melted, adding other pure metals and intermediate alloys, stirring after the pure aluminum is completely melted, respectively adding an impurity removing agent and a deslagging agent for removing impurities and deslagging, wherein the adding amount of the impurity removing agent and the deslagging agent is respectively 2% of the total mass of the melt; meanwhile, a refiner which is 1 percent of the total mass of the melt is added to refine crystal grains, the temperature of the melt is raised to 730 ℃, the temperature is kept for 30min, then the temperature is reduced to 700 ℃ for casting, and a casting mold adopts a water-cooled copper mold.
Impurity removal agent: is prepared from sodium fluoride, sodium chloride and potassium chloride in a mass ratio of 1:1: 1.
Deslagging agent: 4.5 percent of Ti, 1.0 percent of B and the balance of Al.
A refiner: based on the total mass percentage of the molten liquid, the Cu-P intermediate alloy is 0.35 percent, and the Al-Ti-B intermediate alloy is 0.65 percent.
Step 3), homogenizing: homogenizing the cast ingot, and keeping the temperature at 340 ℃ for 30 h.
Step 4), hot extrusion treatment: and extruding the homogenized cast ingot into a cylindrical rod body at the extrusion temperature of 380 ℃, the extrusion speed of 0.5mm/s and the extrusion ratio of 15.
And step 5): and (3) aging treatment: and (3) carrying out aging treatment on the bar at the temperature of 200 ℃ for 20 h.
The high-ductility soluble aluminum alloy obtained by the steps is tested, the room-temperature tensile strength is 289MPa, the yield strength is 189MPa, the elongation is 35 percent, and the corrosion rate in a 3 percent KCl solution is about 50mg/cm 2/h.
Example 2
The high-ductility soluble aluminum alloy comprises the following elements in percentage by weight: mg 1.5 wt%, Ga 1 wt%, In 0.7 wt%, Sn 1 wt%, and the balance of Al and inevitable impurity elements.
The preparation method comprises the following steps:
step 1), weighing the raw materials according to the proportion: weighing pure aluminum ingot, Al-Mg intermediate alloy, Al-Ga intermediate alloy, Al-In intermediate alloy and Al-Sn intermediate alloy.
After the raw materials are weighed, the surfaces of the raw materials are polished by sand, and surface oxide layers are removed.
Step 2), smelting and casting: heating and melting pure aluminum in a graphite crucible, using SF6+ CO2 gas for protection in the melting process, heating the melt to 730 ℃ after the pure aluminum is completely melted, adding other pure metals and intermediate alloys, stirring after the pure aluminum is completely melted, respectively adding an impurity removing agent and a deslagging agent for removing impurities and deslagging, wherein the adding amount of the impurity removing agent and the deslagging agent is respectively 3% of the total mass of the melt; meanwhile, 1 percent of refiner of the total mass of the melt is added to refine the grains; and raising the temperature of the melt to 780 ℃, preserving the heat for 10min, then cooling to 720 ℃ for casting, wherein a water-cooling copper mold is adopted as a casting mold.
Impurity removal agent: is sodium fluoride, sodium chloride and potassium chloride in a mass ratio of 1:1: 1.
Deslagging agent: 5.5 percent of Ti, 0.8 percent of B and the balance of Al.
A refiner: based on the total mass percentage of the molten liquid, the Cu-P intermediate alloy is 0.45 percent, and the Al-Ti-B intermediate alloy is 0.55 percent.
Step 3), homogenizing: homogenizing the cast ingot, and keeping the temperature at 380 ℃ for 25 h.
Step 4), hot extrusion treatment: and extruding the homogenized cast ingot into a cylindrical rod body, wherein the extrusion temperature is 340 ℃, the extrusion speed is 2mm/s, and the extrusion ratio is 20.
Step 5): aging treatment: and (3) carrying out aging treatment on the bar material, wherein the treatment temperature is 170 ℃, and the treatment time is 36 h.
The high-ductility soluble aluminum alloy obtained by the above steps is tested, the room-temperature tensile strength is 346MPa, the yield strength is 225MPa, the elongation is 40%, and the corrosion rate in a 3% KCl solution is about 93mg/cm 2/h.
Example 3
The high-ductility soluble aluminum alloy comprises the following elements in percentage by weight: mg 1.5 wt%, Ga 1 wt%, In 0.7 wt%, Sn 1 wt%, and the balance of Al and inevitable impurity elements.
The preparation method comprises the following steps:
step 1), weighing the raw materials according to the proportion: weighing pure aluminum ingot, Al-Mg intermediate alloy, Al-Ga intermediate alloy, Al-In intermediate alloy and Al-Sn intermediate alloy.
After the raw materials are weighed, the surfaces of the raw materials are polished by sand, and surface oxide layers are removed.
Step 2), smelting and casting: heating and melting pure aluminum in a graphite crucible, using SF6+ CO2 gas for protection in the melting process, heating the melt to 720 ℃ after the pure aluminum is completely melted, adding other pure metals and intermediate alloys, stirring after the pure aluminum is completely melted, respectively adding an impurity removing agent and a slag removing agent for removing impurities and slag, wherein the adding amount of the impurity removing agent and the slag removing agent is respectively 2.5 percent of the total mass of the melt; meanwhile, 1 percent of refiner of the total mass of the melt is added to refine the grains; and raising the temperature of the melt to 750 ℃, preserving the heat for 10min, then cooling to 710 ℃ for casting, wherein a casting mold adopts a water-cooling copper mold.
An impurity removing agent: is sodium fluoride, sodium chloride and potassium chloride in a mass ratio of 1:1: 1.
Deslagging agent: 5% of Ti, 0.9% of B and the balance of Al.
A refiner: based on the total mass percentage of the molten liquid, the Cu-P intermediate alloy is 0.4 percent, and the Al-Ti-B intermediate alloy is 0.6 percent.
Step 3), homogenizing: homogenizing the cast ingot, and keeping the temperature at 365 ℃ for 20 hours.
Step 4), hot extrusion treatment: and extruding the homogenized cast ingot into a cylindrical rod body, wherein the extrusion temperature is 340 ℃, the extrusion speed is 0.8mm/s, and the extrusion ratio is 15.
Step 5): aging treatment: and (3) carrying out aging treatment on the bar, wherein the treatment temperature is 170 ℃, and the treatment time is 24 h.
The high-ductility soluble aluminum alloy obtained by the steps is tested, the room-temperature tensile strength is 325MPa, the yield strength is 213MPa, the elongation is 30 percent, and the corrosion rate in a 3 percent KCl solution is about 56mg/cm 2/h.
From the above, the high-ductility soluble aluminum alloy prepared by the invention realizes the controlled dissolution of the material in a certain temperature or large-load downhole environment, and has high ductility, strength, toughness and other mechanical properties and stable dissolution rate.
The high-ductility soluble aluminum alloy prepared by the invention can be used for manufacturing fracturing tools for shale oil and gas exploitation. When the material is used as a material of a fracturing tool, the material has high ductility, toughness and strength, can be dissolved in a downhole environment, and has a controllable dissolution rate.
Claims (11)
1. A high-ductility soluble aluminum alloy comprises the following elements in percentage by weight: mg 1.5 wt%, Ga 1 wt%, In 0.7 wt%, Sn 1 wt%, and the balance of Al and inevitable impurity elements.
2. The high-ductility soluble aluminum alloy according to claim 1, wherein the high-ductility soluble aluminum alloy has a tensile strength of 260 to 380MPa and an elongation of 30 to 40%.
3. A method of producing a high ductility soluble aluminum alloy as claimed in any one of claims 1 or 2, comprising the steps of:
step 1), weighing all elements according to the weight percentage ratio, introducing Mg by using Al-Mg intermediate alloy, introducing Ga by using Al-Ga intermediate alloy, introducing In by using Al-In intermediate alloy, introducing Sn by using Al-Sn intermediate alloy, and introducing insufficient Al by using pure aluminum ingots;
step 2), smelting and casting: smelting each intermediate alloy and pure aluminum ingot and then casting to obtain an ingot;
step 3) homogenizing treatment: heating the cast ingot and then preserving heat to ensure that the components of the cast ingot are uniformly distributed;
step 4), hot extrusion treatment: hot extruding the cast ingot to form a bar;
and 5) carrying out aging treatment.
4. The method as claimed in claim 3, wherein in step 2), the pure aluminum is melted, SF6+ CO2 gas is used for protection during melting, the temperature of the melt is raised to 730 ℃ along with the temperature of 700 ℃ after the pure aluminum is completely melted, the rest components are added, the melt is stirred, the impurities are removed and the slag is removed after the pure aluminum is completely melted, the temperature of the melt is raised to 780 ℃ along with the temperature of 730 ℃ along with the temperature is maintained for 10-30min, and then the temperature is reduced to 720 ℃ along with the temperature of 700 ℃ along with the temperature of 720 ℃ for casting.
5. The method for preparing the high-ductility soluble aluminum alloy according to claim 4, wherein in the step 2), an impurity removing agent is added for removing impurities, and the components of the impurity removing agent are sodium fluoride, sodium chloride and potassium chloride in a mass ratio of 1:1: 1; the addition amount of the impurity removing agent is 2-3% of the total mass of the melt.
6. The method for preparing the high-ductility soluble aluminum alloy according to claim 4, wherein in the step 2), a slag removing agent is added for removing slag, the slag removing agent is an aluminum-titanium-boron wire, and the aluminum-titanium-boron wire comprises the following components, by mass, 4.5-5.5% of Ti, 0.8-1.0% of B, and the balance of Al, wherein the impurities are as follows: si is less than 0.20%, Fe is less than 0.30%, V is less than 0.25%, other elements are less than 0.03%, and the total content of impurity elements is less than 0.10%; the addition amount of the slag striking agent is 2-3% of the total mass of the melt.
7. The method for preparing the high-ductility soluble aluminum alloy as claimed in claim 4, wherein in the melting process of the step 2), a refiner is added to refine grains, wherein the refiner comprises Cu-P intermediate alloy and Al-Ti-B intermediate alloy, and the proportion of the refiner is 0.35-0.45% of the Cu-P intermediate alloy and 0.55-0.65% of the Al-Ti-B intermediate alloy in percentage by weight; the addition of the refiner is 1 percent of the total mass of the melt.
8. The method for preparing a high-ductility soluble aluminum alloy according to claim 3, wherein in the step 3), the temperature of the homogenization treatment is 340-380 ℃ 0, and the holding time is 20-30 h.
9. The method for preparing a high-ductility soluble aluminum alloy as claimed in claim 3, wherein in the step 4), the extrusion temperature is 340 to 380 ℃, the extrusion speed is 0.5 to 2mm/s, and the extrusion ratio is 15 to 20.
10. The method for preparing a high-ductility soluble aluminum alloy material as claimed in claim 3, wherein in the step 5), the aging treatment temperature is 170-200 ℃ and the treatment time is 20-36 h.
11. Use of a high ductility soluble aluminium alloy as claimed in any one of claims 1 or 2 in the manufacture of a fracturing tool for shale oil and gas exploration.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115572855A (en) * | 2022-11-03 | 2023-01-06 | 青岛大地鑫基材料有限公司 | Method for regulating degradation rate of soluble aluminum alloy |
| CN116005046A (en) * | 2023-01-16 | 2023-04-25 | 中南大学 | High-elongation soluble aluminum alloy and preparation method and application thereof |
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| CN105950920A (en) * | 2016-05-17 | 2016-09-21 | 中国科学院金属研究所 | Aluminum base alloy soluble in water and aqueous medium environments and preparation method thereof |
| CN108251721A (en) * | 2018-01-23 | 2018-07-06 | 中南大学 | A kind of high-strength degradable aluminium alloy and preparation method thereof, application |
| CN114058911A (en) * | 2021-12-10 | 2022-02-18 | 新疆大学 | Aluminum alloy for manufacturing soluble fracturing balls and preparation method thereof |
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| CN105950920A (en) * | 2016-05-17 | 2016-09-21 | 中国科学院金属研究所 | Aluminum base alloy soluble in water and aqueous medium environments and preparation method thereof |
| CN108251721A (en) * | 2018-01-23 | 2018-07-06 | 中南大学 | A kind of high-strength degradable aluminium alloy and preparation method thereof, application |
| CN114058911A (en) * | 2021-12-10 | 2022-02-18 | 新疆大学 | Aluminum alloy for manufacturing soluble fracturing balls and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115572855A (en) * | 2022-11-03 | 2023-01-06 | 青岛大地鑫基材料有限公司 | Method for regulating degradation rate of soluble aluminum alloy |
| CN116005046A (en) * | 2023-01-16 | 2023-04-25 | 中南大学 | High-elongation soluble aluminum alloy and preparation method and application thereof |
| CN116005046B (en) * | 2023-01-16 | 2023-11-21 | 中南大学 | High-elongation soluble aluminum alloy and preparation method and application thereof |
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