CN112831700B - High-strength corrosion-resistant aluminum alloy for contact net and preparation method thereof - Google Patents
High-strength corrosion-resistant aluminum alloy for contact net and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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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- 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
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Abstract
The invention discloses a high-strength corrosion-resistant aluminum alloy for a contact net and a preparation method thereof, wherein the alloy comprises the following components in percentage by mass: si: 0.98-1.35%, Mg: 1.7-2.2%, Cu: 0.045-0.087%, Fe: 0.04-0.11%, Zn: 0.01-0.037%, Cr: 0.1-0.16%, Mn: 0.47-0.53%, Ti: 0.01-0.05%, Zr: 0.1-0.15%, Sn: 0.04-0.09%, Te + Sb: 0.013-0.025%, Sc + Be: 0.05-0.12%, Ag + Sr + Y: 0.2-0.8% and the balance of Al. The preparation method of the high-strength corrosion-resistant aluminum alloy for the contact net provided by the invention is simple in process and mild in condition, the obtained alloy is high in strength, good in toughness and corrosion resistance, and the prepared contact net is long in service life.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a high-strength corrosion-resistant aluminum alloy for a contact net and a preparation method thereof.
Background
The contact network system is one of the important systems of the electrified railway, is a power source of locomotives and motor train units, is a special power supply line, is erected over the railway line and supplies power to electric locomotives or motor train units. The aluminum alloy has the advantages of small density, high strength, good processing performance, easy forming, strong atmospheric corrosion resistance, low price and the like, is generally adopted on a contact net, and has good use condition as a whole. However, with the increasing extension of high-speed rail lines, the performance requirements for high-speed rail contact net parts are different under different geographical environments and climatic conditions, and the strength and corrosion resistance of the existing aluminum alloy material are still not ideal, so that the use requirements of contact nets in coastal areas, saline-alkali areas, chemical pollution areas, high altitude areas and the like cannot be met.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides the high-strength corrosion-resistant aluminum alloy for the contact net and the preparation method thereof.
The invention provides a high-strength corrosion-resistant aluminum alloy for a contact net, which comprises the following chemical components in percentage by mass: si: 0.98-1.35%, Mg: 1.7-2.2%, Cu: 0.045-0.087%, Fe: 0.04-0.11%, Zn: 0.01-0.037%, Cr: 0.1-0.16%, Mn: 0.47-0.53%, Ti: 0.01-0.05%, Zr: 0.1-0.15%, Sn: 0.04-0.09%, Te + Sb: 0.013-0.025%, Sc + Be: 0.05-0.12%, Ag + Sr + Y: 0.2-0.8% and the balance of Al.
Preferably, the composition of the alloy comprises the following components in percentage by mass: Mg/Si ═ 1.48 to 2.1, and Mg + Si ═ 3 to 3.5%.
Preferably, the composition of the alloy comprises Te, Sb, Sc, Be, Ag, Sr and Y in percentage by mass, and the mass percent of Te, Sb, Sc, Be, Ag, Sr and Y satisfies the following relational expression: te ═ 3 × Sb; sc is more than or equal to Be-0.03%; ag 1.6 × Sr 0.8 × Y.
Preferably, the composition of the alloy comprises Te, Sb, Sc, Be, Ag, Sr and Y in percentage by mass, and the mass percent of Te, Sb, Sc, Be, Ag, Sr and Y satisfies the following relational expression: te + Sb + Sc + Be + Ag + Sr + Y is more than or equal to 0.51% and less than or equal to 0.7%.
Preferably, the high-strength corrosion-resistant aluminum alloy for the contact net comprises the following chemical components in percentage by mass: si: 1.05%, Mg: 2.1%, Cu: 0.07%, Fe: 0.08%, Zn: 0.015%, Cr: 0.12%, Mn: 0.52%, Ti: 0.03%, Zr: 0.14%, Sn: 0.058%, Te: 0.015%, Sb: 0.005%, Sc: 0.06%, Be: 0.04%, Ag: 0.192%, Sr: 0.12%, Y: 0.24% and the balance of Al.
The invention also provides a preparation method of the high-strength corrosion-resistant aluminum alloy for the contact net, which comprises the following steps:
s1, adding the raw materials into a smelting device for smelting, and casting to obtain an ingot;
s2, preserving the heat of the ingot for 2-4h at the temperature of 460-470 ℃, preserving the heat for 2-5h at the temperature of 520-548 ℃, preserving the heat for 3-7h at the temperature of 555-570 ℃, cooling to room temperature, and quenching to obtain a blank after extrusion;
s3, carrying out heat treatment on the obtained blank to obtain the high-strength corrosion-resistant aluminum alloy for the overhead line system; wherein, theThe heat treatment comprises the steps of carrying out solid solution for 1-2h at T ℃, then carrying out solid solution for 1-2h at T +28 ℃, and carrying out aging for 3-6h at 185 ℃ after water quenching; t340 +18000 XCSi，CSiIs the mass percentage of Si.
Preferably, in S2, the cooling rate is 250-.
Preferably, in S2, the quenching is water quenching.
The high-strength corrosion-resistant aluminum alloy for the contact network has the advantages that Si, Mg, Cu, Fe, Zn, Cr, Mn, Ti, Zr, Sn, Te, Sb, Sc, Be, Ag, Sr and Y are specifically added into the components, and the content of each element is optimized, so that the obtained aluminum material has high strength, good toughness and excellent corrosion resistance, and meets the use requirement of the contact network; specifically, the mass percentages of Mg and Si are controlled to satisfy the relation: Mg/Si is 1.48-2.1, and Mg + Si is 3-3.5%, refining Mg2Si particles are precipitated, so that the strengthening effect is achieved, the mechanical property of the material is improved, the formation of an L phase is promoted, the precipitation of Q' and Si particles is inhibited, a channel cannot be continuously corroded, and the corrosion resistance of the alloy is improved; te, Sb, Sc, Be, Ag, Sr and Y are added into the system, and the mass percentage of the Te, Sb, Sc, Be, Ag, Sr and Y meets the following relational expression: te ═ 3 × Sb; sc is more than or equal to Be-0.03%; ag 1.6 × Sr 0.8 × Y; te + Sb + Sc + Be + Ag + Sr + Y is more than or equal to 0.51% and less than or equal to 0.7%, the diffusion of Mg atoms and Si atoms in beta 'phase is inhibited, the beta' phase size is reduced, and the tensile strength and the yield strength of the alloy are obviously improved; in the preparation method, the ingot is specifically insulated for 2-4h at the temperature of 460-470 ℃, insulated for 2-5h at the temperature of 520-548 ℃ and insulated for 3-7h at the temperature of 555-570 ℃, and Mg in the alloy2Spheroidizing Si phase from strip shape to black point shape, gradually dissolving the spheroidizing Si phase into a matrix, and controlling the heat treatment process, specifically comprising solid solution at T ℃ for 1-2h, then solid solution at T +28 ℃ for 1-2h, and aging at 185 ℃ for 3-6h after water quenching; t340 +18000 XCSi，CSiThe mass percentage of Si effectively improves the precipitation and distribution state of the second phase of the alloy, so that the obtained aluminum alloy has excellent corrosion resistance, high strength and good toughness.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A high-strength corrosion-resistant aluminum alloy for a contact net comprises the following chemical components in percentage by mass: si: 1.35%, Mg: 1.7%, Cu: 0.087%, Fe: 0.04%, Zn: 0.037%, Cr: 0.1%, Mn: 0.47%, Ti: 0.01%, Zr: 0.15%, Sn: 0.07%, Te + Sb: 0.013%, Sc + Be: 0.12%, Ag + Sr + Y: 0.6 percent and the balance of Al.
The invention also provides a preparation method of the high-strength corrosion-resistant aluminum alloy for the contact net, which comprises the following steps:
s1, adding the raw materials into a smelting device for smelting, and casting to obtain an ingot;
s2, preserving heat of the cast ingot at 460 ℃ for 4h, preserving heat at 520 ℃ for 5h, preserving heat at 555 ℃ for 3h, cooling to room temperature, extruding and quenching to obtain a blank;
s3, carrying out heat treatment on the obtained blank to obtain the high-strength corrosion-resistant aluminum alloy for the overhead line system; wherein the heat treatment comprises solid solution at T ℃ for 1h, then solid solution at T +28 ℃ for 2h, water quenching and aging at 170 ℃ for 3 h; wherein, T is 340+18000 XCSi，CSiThe mass percentage of Si is 340+18000 × 1.35% and 583%.
Example 2
A high-strength corrosion-resistant aluminum alloy for a contact net comprises the following chemical components in percentage by mass: si: 1%, Mg: 2.2%, Cu: 0.045%, Fe: 0.11%, Zn: 0.01%, Cr: 0.16%, Mn: 0.49%, Ti: 0.05%, Zr: 0.12%, Sn: 0.04%, Te: 0.01%, Sb: 0.015%, Sc: 0.01%, Be: 0.04%, Ag: 0.1%, Sr: 0.5%, Y: 0.2 percent and the balance of Al.
The invention also provides a preparation method of the high-strength corrosion-resistant aluminum alloy for the contact net, which comprises the following steps:
s1, adding the raw materials into a smelting device for smelting, and casting to obtain an ingot;
s2, preserving heat of the cast ingot at 470 ℃ for 2h, preserving heat at 548 ℃ for 2h, preserving heat at 570 ℃ for 5h, cooling to room temperature, extruding and then performing water quenching to obtain a blank; wherein the cooling speed is 320 ℃/h;
s3, carrying out heat treatment on the obtained blank to obtain the high-strength corrosion-resistant aluminum alloy for the overhead line system; wherein the heat treatment comprises the steps of carrying out solid solution at T ℃ for 2h, then carrying out solid solution at T +28 ℃ for 1h, carrying out water quenching, and then carrying out aging at 180 ℃ for 5 h; t340 +18000 XCSi，CSiT340 +18000 × 1% 520 is the mass percentage of Si.
Example 3
A high-strength corrosion-resistant aluminum alloy for a contact net comprises the following chemical components in percentage by mass: si: 1.35%, Mg: 2%, Cu: 0.045%, Fe: 0.11%, Zn: 0.01%, Cr: 0.16%, Mn: 0.53%, Ti: 0.05%, Zr: 0.1%, Sn: 0.09%, Te: 0.012%, Sb: 0.004%, Sc: 0.036%, Be: 0.05%, Ag: 0.208%, Sr: 0.13%, Y: 0.26% and the balance of Al.
The invention also provides a preparation method of the high-strength corrosion-resistant aluminum alloy for the contact net, which comprises the following steps:
s1, adding the raw materials into a smelting device for smelting, and casting to obtain an ingot;
s2, preserving heat of the cast ingot at 455 ℃ for 3h, preserving heat at 525 ℃ for 3h, preserving heat at 560 ℃ for 7h, cooling to room temperature, extruding and quenching to obtain a blank; wherein the cooling rate is 250 ℃/h; the quenching is water quenching;
s3, carrying out heat treatment on the obtained blank to obtain the high-strength corrosion-resistant aluminum alloy for the overhead line system; wherein the heat treatment comprises solid solution at T ℃ for 1h, then solid solution at T +28 ℃ for 2h, water quenching and aging at 185 ℃ for 6 h; t340 +18000 XCSi，CSiT is 340+18000 × 1.35% and 583% in terms of the mass percentage of Si.
Example 4
A high-strength corrosion-resistant aluminum alloy for a contact net comprises the following chemical components in percentage by mass: si: 0.98%, Mg: 2.058%, Cu: 0.087%, Fe: 0.04%, Zn: 0.037%, Cr: 0.1%, Mn: 0.47%, Ti: 0.01%, Zr: 0.15%, Sn: 0.04%, Te: 0.018%, Sb: 0.006%, Sc: 0.05%, Be: 0.05%, Ag: 0.2%, Sr: 0.125%, Y: 0.25 percent and the balance of Al.
The invention also provides a preparation method of the high-strength corrosion-resistant aluminum alloy for the contact net, which comprises the following steps:
s1, adding the raw materials into a smelting device for smelting, and casting to obtain an ingot;
s2, keeping the temperature of the cast ingot at 463 ℃ for 3.5h, keeping the temperature at 525 ℃ for 4h, keeping the temperature at 558 ℃ for 7h, cooling to room temperature, extruding and quenching to obtain a blank; the cooling speed is 300 ℃/h; the quenching is water quenching;
s3, carrying out heat treatment on the obtained blank to obtain the high-strength corrosion-resistant aluminum alloy for the overhead line system; wherein the heat treatment comprises the steps of solid solution at T ℃ for 1.5h, then solid solution at T +28 ℃ for 1h, water quenching and aging at 180 ℃ for 4 h; t340 +18000 XCSi＝340+18000×0.98％＝516，CSiIs the mass percentage of Si.
Example 5
A high-strength corrosion-resistant aluminum alloy for a contact net comprises the following chemical components in percentage by mass: si: 1.1%, Mg: 2.2%, Cu: 0.053%, Fe: 0.07%, Zn: 0.025%, Cr: 0.13%, Mn: 0.49%, Ti: 0.03%, Zr: 0.12%, Sn: 0.05%, Te: 0.0135%, Sb: 0.0045%, Sc: 0.06%, Be: 0.06%, Ag: 0.1568%, Sr: 0.098%, Y: 0.196%, and the balance of Al.
The invention also provides a preparation method of the high-strength corrosion-resistant aluminum alloy for the contact net, which comprises the following steps:
s1, adding the raw materials into a smelting device for smelting, and casting to obtain an ingot;
s2, preserving heat of the cast ingot at 468 ℃ for 2.5h, preserving heat at 540 ℃ for 3h, preserving heat at 565 ℃ for 4h, cooling to room temperature, extruding and quenching to obtain a blank; the cooling speed is 260 ℃/h; the quenching is water quenching;
s3, carrying out heat treatment on the obtained blank to obtain the high-strength corrosion-resistant aluminum alloy for the overhead line system; wherein the heat treatment comprises solid solution at T ℃ for 2h, then solid solution at T +28 ℃ for 1.5h, and water quenchingThen aging for 5h at 173 ℃; t340 +18000 XCSi＝340+18000×1.1％＝538，CSiIs the mass percentage of Si.
Example 6
A high-strength corrosion-resistant aluminum alloy for a contact net comprises the following chemical components in percentage by mass: si: 1.05%, Mg: 2.1%, Cu: 0.07%, Fe: 0.08%, Zn: 0.015%, Cr: 0.12%, Mn: 0.52%, Ti: 0.03%, Zr: 0.14%, Sn: 0.058%, Te: 0.015%, Sb: 0.005%, Sc: 0.06%, Be: 0.04%, Ag: 0.192%, Sr: 0.12%, Y: 0.24% and the balance of Al.
The invention also provides a preparation method of the high-strength corrosion-resistant aluminum alloy for the contact net, which comprises the following steps:
s1, adding the raw materials into a smelting device for smelting, and casting to obtain an ingot;
s2, preserving heat of the cast ingot at 465 ℃ for 3h, preserving heat at 540 ℃ for 4h, preserving heat at 560 ℃ for 4h, cooling to room temperature, extruding and quenching to obtain a blank; the cooling speed is 290 ℃/h; the quenching is water quenching;
s3, carrying out heat treatment on the obtained blank to obtain the high-strength corrosion-resistant aluminum alloy for the overhead line system; wherein the heat treatment comprises the steps of solid solution at T ℃ for 1h, then solid solution at T +28 ℃ for 2h, water quenching and aging at 178 ℃ for 5 h; t340 +18000 XCSi＝340+18000×1.05％＝529，CSiIs the mass percentage of Si.
According to GB/T228.1-2010 part 1 of the tensile test of metallic materials: room temperature test method mechanical properties of the aluminum alloys of examples 1 to 6 were measured; the test shows that the tensile strength is more than or equal to 421MPa, the yield strength is more than or equal to 395MPa, and the elongation is more than or equal to 14.5 percent.
The aluminum alloys in examples 1-6 were tested and analyzed according to the GB/T7998-2005 aluminum alloy intergranular corrosion determination method, with lower rating numbers indicating better corrosion resistance; the corrosion grade is 1 grade through testing.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. The high-strength corrosion-resistant aluminum alloy for the contact net is characterized by comprising the following chemical components in percentage by mass: si: 0.98-1.35%, Mg: 1.7-2.2%, Cu: 0.045-0.087%, Fe: 0.04-0.11%, Zn: 0.01-0.037%, Cr: 0.1-0.16%, Mn: 0.47-0.53%, Ti: 0.01-0.05%, Zr: 0.1-0.15%, Sn: 0.04-0.09%, Te + Sb: 0.013-0.025%, Sc + Be: 0.05-0.12%, Ag + Sr + Y: 0.2-0.8% and the balance of Al;
wherein, in the components, the mass percentage of Mg and Si satisfies the following relational expression: Mg/Si =1.48-2.1, and Mg + Si = 3-3.5%; in the components, the mass percentages of Te, Sb, Sc, Be, Ag, Sr and Y satisfy the following relational expression: te =3 × Sb; sc is more than or equal to Be-0.03%; ag =1.6 × Sr =0.8 × Y; in the components, the mass percentages of Te, Sb, Sc, Be, Ag, Sr and Y satisfy the following relational expression: te + Sb + Sc + Be + Ag + Sr + Y is more than or equal to 0.51% and less than or equal to 0.7%;
the tensile strength of the aluminum alloy is more than or equal to 421MPa, the yield strength is more than or equal to 395MPa, and the elongation is more than or equal to 14.5%;
the preparation method of the high-strength corrosion-resistant aluminum alloy for the contact net comprises the following steps:
s1, adding the raw materials into a smelting device for smelting, and casting to obtain an ingot;
s2, preserving the heat of the ingot for 2-4h at the temperature of 460-470 ℃, preserving the heat for 2-5h at the temperature of 520-548 ℃, preserving the heat for 3-7h at the temperature of 555-570 ℃, cooling to room temperature, and quenching to obtain a blank after extrusion;
s3, carrying out heat treatment on the obtained blank to obtain the high-strength corrosion-resistant aluminum alloy for the overhead line system; wherein the heat treatment comprises the steps of solid solution at T ℃ for 1-2h, then solid solution at T +28 ℃ for 1-2h, and aging at 170-185 ℃ for 3-6h after water quenching; t =340+18000 × CSi，CSiIs the mass percentage of Si.
2. The high-strength corrosion-resistant aluminum alloy for the overhead line system of claim 1, which comprises the following chemical components in percentage by mass: si: 1.05%, Mg: 2.1%, Cu: 0.07%, Fe: 0.08%, Zn: 0.015%, Cr: 0.12%, Mn: 0.52%, Ti: 0.03%, Zr: 0.14%, Sn: 0.058%, Te: 0.015%, Sb: 0.005%, Sc: 0.06%, Be: 0.04%, Ag: 0.192%, Sr: 0.12%, Y: 0.24% and the balance of Al.
3. The high-strength corrosion-resistant aluminum alloy for the overhead line system of claim 1 or 2, wherein the cooling rate in S2 is 250-320 ℃/h.
4. The high-strength corrosion-resistant aluminum alloy for the overhead line system of claim 1 or 2, wherein in S2, the quenching is water quenching.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101536112A (en) * | 2006-10-30 | 2009-09-16 | 株式会社自动网络技术研究所 | Wire conductor and process for producing the same |
| CN102268575A (en) * | 2011-07-20 | 2011-12-07 | 安徽欣意电缆有限公司 | Aluminum alloy material and preparation method thereof |
| CN106574327A (en) * | 2014-08-27 | 2017-04-19 | 株式会社神户制钢所 | Aluminum alloy sheet for forming |
| CN110066932A (en) * | 2019-06-10 | 2019-07-30 | 福建祥鑫股份有限公司 | A kind of anti-corrosion 6xxx line aluminium alloy of medium weldability and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0273939A (en) * | 1988-09-09 | 1990-03-13 | Honda Motor Co Ltd | Corrosion-resistant aluminum alloy for heat exchanger |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101536112A (en) * | 2006-10-30 | 2009-09-16 | 株式会社自动网络技术研究所 | Wire conductor and process for producing the same |
| CN102268575A (en) * | 2011-07-20 | 2011-12-07 | 安徽欣意电缆有限公司 | Aluminum alloy material and preparation method thereof |
| CN106574327A (en) * | 2014-08-27 | 2017-04-19 | 株式会社神户制钢所 | Aluminum alloy sheet for forming |
| CN110066932A (en) * | 2019-06-10 | 2019-07-30 | 福建祥鑫股份有限公司 | A kind of anti-corrosion 6xxx line aluminium alloy of medium weldability and preparation method thereof |
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