CN110629069A - Niobium microalloyed multi-element complex cast aluminum bronze alloy - Google Patents
Niobium microalloyed multi-element complex cast aluminum bronze alloy Download PDFInfo
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- CN110629069A CN110629069A CN201810657016.8A CN201810657016A CN110629069A CN 110629069 A CN110629069 A CN 110629069A CN 201810657016 A CN201810657016 A CN 201810657016A CN 110629069 A CN110629069 A CN 110629069A
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/05—Alloys based on copper with manganese as the next major constituent
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Abstract
The invention discloses a niobium microalloyed multi-element complex cast aluminum bronze alloy, which comprises the following components in percentage by mass: al: 7.5-8.5%, Fe: 3.0-4.0%, Ni: 2.0-2.5%, Mn: 11.0-13.0%, Nb: 0.2-1.0% and the balance of Cu. The niobium microalloyed high-performance multi-element complex cast aluminum bronze alloy takes an aluminum bronze alloy system as a matrix, and the high-performance niobium microalloyed aluminum bronze alloy is obtained by greatly refining grains through niobium microalloying, so that the strength and the hardness of the alloy can be obviously improved.
Description
Technical Field
The invention discloses a niobium microalloyed multi-element complex cast aluminum bronze alloy, belonging to the technical field of non-ferrous metal preparation.
Background
Copper alloy materials are widely used in various industries due to excellent electrical conductivity, thermal conductivity and corrosion resistance, good processing and forming properties and the like, but among numerous metal materials, copper alloys still belong to materials with low strength and low hardness.
In various series of copper alloys, the aluminum bronze alloy keeps excellent electric and heat conducting performance and excellent plasticity, and has higher strength and excellent wear resistance and corrosion resistance. At present, the tensile strength sigma of the aluminum bronze alloy ZCuAl8Mn13Fe3Ni2 at room temperatureb670MPa, room temperature yield strength sigmas310MPa, elongation delta 5 (%) > 18 and hardness 167 HB.
Aluminum bronze alloys have been used in many fields, for example, aluminum bronze alloys are used for manufacturing automobile synchronizer rings, the worldwide production amount per year is more than 6000 tons, the worldwide market demand per year for synchronizer rings is more than 10000 tons, but at present, most of synchronizer rings produced in China are manufactured by complex brass alloys, and the complex brass alloys can be compared with aluminum bronze alloys in strength and hardness, but are easy to generate thermal cracking segregation and the like. The aluminum bronze alloy is also commonly used for manufacturing a nut for a rolling mill, the nut has very large loss caused by poor mechanical properties in the using process, and the loss of many steel companies in China exceeds millions of yuan each year because of low strength and low hardness of the nut.
Therefore, the problem of the aluminum bronze alloy is how to further improve the mechanical properties such as strength and hardness. The method for improving the strength and the hardness of the alloy mainly comprises methods such as strain strengthening, solid solution strengthening, dispersion strengthening and the like, wherein the common method in the current production is the strain strengthening, but the strain strengthening limits the application of the aluminum bronze alloy in certain fields.
Disclosure of Invention
In order to solve the problems of low strength and low hardness of aluminum bronze, the invention aims to provide a niobium microalloyed multi-element complex cast aluminum bronze alloy.
The technical scheme adopted for achieving the purpose of the invention is as follows:
a niobium microalloyed multi-element complex cast aluminum bronze alloy comprises the following chemical components in percentage by mass: 7.5 to 8.5 percent of Al, 3.0 to 4.0 percent of Fe, 2.0 to 2.5 percent of Ni, 11.0 to 13.0 percent of Mn, 0.2 to 1.0 percent of Nb and the balance of Cu.
The preparation method of the niobium microalloyed multi-element complex cast aluminum bronze alloy bar specifically comprises the following steps:
(1) firstly, cleaning a furnace body of an induction smelting furnace to prevent impurities from polluting a sample;
(2) accurately weighing each metal simple substance according to the alloy components, uniformly mixing, putting into a crucible, putting the crucible into an induction smelting furnace, starting an induction smelting power supply to heat the alloy to a melting point of 200K or above, preserving the heat for 10min, uniformly melting, and pouring into a low-carbon steel bar mold with the inner diameter of phi 20mm to obtain an alloy bar with the diameter of phi 20 mm.
Compared with the prior art, the invention has the following remarkable advantages: 1. the invention greatly improves the strength and hardness of the alloy after microalloying. ZCuAl8Mn13Fe3Ni2 room temperature tensile strength sigmab670MPa, room temperature yield strength sigmas310MPa, elongation delta 5 (%) > 18 and hardness 167 HB. 2. Sigma of alloy after Nb microalloying is added in the inventionb870MPa can be reached, which is increased by 200MPa compared with the original system; sigmasCan reach 390MPa, which is improved by 80MPa compared with the original system; elongation δ 5 (%) ═ 14; the hardness of the alloy after microalloying can reach 260HB, and is improved by 93HB compared with that of the original system.
Drawings
FIG. 1 is a microstructure of an alloy ingot of a comparative example.
FIG. 2 is the microstructure of the alloy ingot of example 1.
FIG. 3 is the microstructure of the alloy ingot of example 3.
FIG. 4 is the microstructure of the alloy ingot of example 5.
Detailed Description
The invention will be further explained with reference to the following examples and drawings
Example 1
A microalloyed copper alloy comprises the following chemical components in percentage by mass: 8.0 percent of Al, 3.5 percent of Fe, 2.3 percent of Ni, 12.0 percent of Mn, 0.2 percent of Nb and the balance of Cu.
Firstly, cleaning a smelting furnace body, weighing each metal simple substance according to a target component alloy, uniformly mixing, putting into a crucible, putting the crucible into an induction smelting furnace, starting an induction smelting power supply to heat the alloy, keeping the temperature for 10min after reaching the melting point of more than 200K, uniformly melting, and then pouring into a low-carbon steel bar mold with the inner diameter of phi 20mm to obtain an alloy bar with the diameter of phi 20 mm.
The microstructure of the alloy ingot is observed, and the grain size of the alloy ingot obtained under the mixture ratio is 7.4 mu m and is reduced by 5 mu m compared with the grain size of the original copper-aluminum alloy system.
Nb is enriched near the grain boundary, and lath-shaped grains are fragmented and split into a plurality of small blocky grains near the enrichment region, but a plurality of large lath-shaped grains still exist outside the enrichment region.
And performing Brinell hardness test on the alloy ingot according to the national standard to obtain the alloy ingot with the Brinell hardness of 190 HB.
According to the national standard of tensile test, the alloy ingot is made into tensile test samples meeting the national standard and is subjected to tensile property test to obtain the tensile strength sigmab750MPa, yield strength sigma 330MPa, and elongation delta 5 (%) -17.
Example 2
A microalloyed copper alloy comprises the following chemical components in percentage by mass: al: 8.0%, Fe: 3.5%, Ni: 2.3%, Mn:12.0 percent, 0.4 percent of Nb and the balance of Cu.
Firstly, cleaning a smelting furnace body, weighing each metal simple substance according to a target component alloy, uniformly mixing, putting into a crucible, putting the crucible into an induction smelting furnace, starting an induction smelting power supply to heat the alloy, keeping the temperature for 10min after reaching the melting point of more than 200K, uniformly melting, and then pouring into a low-carbon steel bar mold with the inner diameter of phi 20mm to obtain an alloy bar with the diameter of phi 20 mm.
The microstructure of the alloy ingot is observed, and the grain size of the alloy ingot obtained under the mixture ratio is 4.6 μm and is reduced by 7.8 μm compared with the grain size of the original copper-aluminum alloy system.
And performing Brinell hardness test on the alloy ingot according to the national standard to obtain the Brinell hardness of 201 HB.
According to the national standard of tensile test, the alloy ingot is made into tensile test samples meeting the national standard and is subjected to tensile property test to obtain the tensile strength sigmab798MPa, 349MPa of yield strength σ, and 17 (%) elongation δ 5.
Example 3
A microalloyed copper alloy comprises the following chemical components in percentage by mass: 8.0 percent of Al, 3.5 percent of Fe, 2.3 percent of Ni, 12.0 percent of Mn, 0.6 percent of Nb and the balance of Cu.
Firstly, cleaning a smelting furnace body, weighing each metal simple substance according to a target component alloy, uniformly mixing, putting into a crucible, putting the crucible into an induction smelting furnace, starting an induction smelting power supply to heat the alloy, keeping the temperature for 10min after reaching the melting point of more than 200K, uniformly melting, and then pouring into a low-carbon steel bar mold with the inner diameter of phi 20mm to obtain an alloy bar with the diameter of phi 20 mm.
The microstructure of the alloy ingot is observed, and the grain size of the alloy ingot obtained under the mixture ratio is 3.5 mu m and is reduced by 8.9 mu m compared with the grain size of the original copper-aluminum alloy system.
As the amount of Nb added increases, the grains in the Nb-rich zone become increasingly refined, and outside the rich zone, a large portion of the lath-like grains begin to fracture to form small grains.
And performing Brinell hardness test on the alloy ingot according to the national standard to obtain the Brinell hardness of 225 HB.
According to the national standard of tensile test, the alloy ingot is made into tensile test samples meeting the national standard and is subjected to tensile property test to obtain the tensile strength sigmab834MPa, 362MPa yield strength σ, and 16 elongation δ 5 (%).
Example 4
A microalloyed copper alloy comprises the following chemical components in percentage by mass: 8.0 percent of Al, 3.5 percent of Fe, 2.3 percent of Ni, 12.0 percent of Mn, 0.8 percent of Nb and the balance of Cu.
Firstly, cleaning a smelting furnace body, weighing each metal simple substance according to a target component alloy, uniformly mixing, putting into a crucible, putting the crucible into an induction smelting furnace, starting an induction smelting power supply to heat the alloy, keeping the temperature for 10min after reaching the melting point of more than 200K, uniformly melting, and then pouring into a low-carbon steel bar mold with the inner diameter of phi 20mm to obtain an alloy bar with the diameter of phi 20 mm.
The microstructure of the alloy ingot is observed, and the grain size of the alloy ingot obtained under the mixture ratio is 3.1 mu m and is reduced by 9.3 mu m compared with the grain size of the original copper-aluminum alloy system.
And (4) carrying out Brinell hardness test on the alloy cast ingot according to the national standard to obtain the Brinell hardness of 243 HB.
According to the national standard of tensile test, the alloy ingot is made into tensile test samples meeting the national standard and is subjected to tensile property test to obtain the tensile strength sigmab858MPa, yield strength σ of 375MPa, and elongation δ 5 (%) -15.
Example 5
A microalloyed copper alloy comprises the following chemical components in percentage by mass: 8.0 percent of Al, 3.5 percent of Fe, 2.3 percent of Ni, 12.0 percent of Mn, 1.0 percent of Nb and the balance of Cu.
Firstly, cleaning a smelting furnace body, weighing each metal simple substance according to a target component alloy, uniformly mixing, putting into a crucible, putting the crucible into an induction smelting furnace, starting an induction smelting power supply to heat the alloy, keeping the temperature for 10min after reaching the melting point of more than 200K, uniformly melting, and then pouring into a low-carbon steel bar mold with the inner diameter of phi 20mm to obtain an alloy bar with the diameter of phi 20 mm.
The microstructure of the alloy ingot was observed, and it was found that the grain size of the alloy ingot obtained at this ratio was 2.7 μm, which was reduced by about 9.7 μm as compared with the grain size of the original Cu-Al alloy system.
The addition of Nb amounted to 1.0%, resulting in elongated acicular grains, and it was found that the acicular grains were broken into very fine grains in the Nb-enriched zone.
And performing Brinell hardness test on the alloy ingot according to the national standard to obtain the Brinell hardness of 260 HB.
According to the national standard of tensile test, the alloy ingot is made into tensile test samples meeting the national standard and is subjected to tensile property test to obtain the tensile strength sigmab870MPa, yield strength σ of 390MPa, and elongation δ 5 (%) -14.
Comparative example
An aluminum bronze alloy comprises the following chemical components in percentage by mass: 8.0 percent of Al, 3.5 percent of Fe, 2.3 percent of Ni, 12.0 percent of Mn and 74.2 percent of Cu.
Firstly, cleaning a smelting furnace body, weighing each metal simple substance according to a target component alloy, uniformly mixing, putting into a crucible, putting the crucible into an induction smelting furnace, starting an induction smelting power supply to heat the alloy, keeping the temperature for 10min after reaching the melting point of more than 200K, uniformly melting, and then pouring into a low-carbon steel bar mold with the inner diameter of phi 20mm to obtain an alloy bar with the diameter of phi 20 mm.
Observing the microstructure of the alloy cast ingot, wherein the grain size of the alloy cast ingot under the mixture ratio is 12.4 mu m.
And performing Brinell hardness test on the alloy ingot according to the national standard to obtain the Brinell hardness of 168 HB.
According to the national standard of tensile test, the alloy ingot is made into tensile test samples meeting the national standard and is subjected to tensile property test to obtain the tensile strength sigmab674MPa, yield strength σ 313MPa, and elongation δ 5 (%) -18.
Claims (9)
1. The niobium microalloyed multi-element complex cast aluminum bronze alloy is characterized by comprising the following components in percentage by mass: 7.5-8.5% of Al, 3.0-4.0% of Fe, 2.0-2.5% of Ni, 11.0-13.0% of Mn, 0.2-1.0% of Nb and the balance of Cu and impurities difficult to remove, wherein the impurity content is less than or equal to 0.03%.
2. The niobium microalloyed multi-element complex cast aluminum bronze alloy according to claim 1, wherein the alloy comprises, by mass, 8.0% of Al, 3.5% of Fe, 2.3% of Ni, 12.0% of Mn, 0.2% of Nb, and the balance of Cu and difficult-to-remove impurities, and the impurity content is 0.03% or less.
3. The niobium microalloyed multi-element complex cast aluminum bronze alloy according to claim 1, wherein the alloy comprises, by mass, 8.0% of Al, 3.5% of Fe, 2.3% of Ni, 12.0% of Mn, 0.4% of Nb, and the balance of Cu and difficult-to-remove impurities, and the impurity content is 0.03% or less.
4. The niobium microalloyed multi-element complex cast aluminum bronze alloy according to claim 1, wherein the alloy comprises, by mass, 8.0% of Al, 3.5% of Fe, 2.3% of Ni, 12.0% of Mn, 0.6% of Nb, and the balance of Cu and difficult-to-remove impurities, and the impurity content is 0.03% or less.
5. The niobium microalloyed multi-element complex cast aluminum bronze alloy according to claim 1, wherein the alloy comprises, by mass, 8.0% of Al, 3.5% of Fe, 2.3% of Ni, 12.0% of Mn, 0.8% of Nb, and the balance of Cu and difficult-to-remove impurities, and the impurity content is 0.03% or less.
6. The niobium microalloyed multi-element complex cast aluminum bronze alloy according to claim 1, wherein the alloy comprises, by mass, 8.0% of Al, 3.5% of Fe, 2.3% of Ni, 12.0% of Mn, 1.0% of Nb, and the balance of Cu and difficult-to-remove impurities, and the impurity content is 0.03% or less.
7. The niobium microalloyed multi-element complex cast aluminum bronze alloy bar is characterized by comprising the following components in percentage by mass: 7.5 to 8.5% of Al, 3.0 to 4.0% of Fe, 2.0 to 2.5% of Ni, 11.0 to 13.0% of Mn, and 0.2 to 1.0% of Nb.
8. A preparation method of the multi-element complex casting aluminum bronze alloy bar based on the niobium microalloying of claim 7 is characterized by comprising the following preparation processes: weighing each metal simple substance according to the target component alloy, uniformly mixing, putting into a crucible, putting the crucible into an induction smelting furnace, starting an induction smelting power supply to heat the alloy to be more than a melting point of 200K, preserving the heat for 10min, uniformly melting, and pouring into a low-carbon steel bar mold to obtain the bronze alloy bar.
9. The method of claim 8, wherein the diameter of the bronze alloy rod is 20 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810657016.8A CN110629069A (en) | 2018-06-25 | 2018-06-25 | Niobium microalloyed multi-element complex cast aluminum bronze alloy |
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| CN201810657016.8A CN110629069A (en) | 2018-06-25 | 2018-06-25 | Niobium microalloyed multi-element complex cast aluminum bronze alloy |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101381824A (en) * | 2008-10-09 | 2009-03-11 | 苏州有色金属研究院有限公司 | Multi-aluminum bronze material for pipe |
| CN105586504A (en) * | 2016-03-08 | 2016-05-18 | 黄力 | Large shaft sleeve and casting method thereof |
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2018
- 2018-06-25 CN CN201810657016.8A patent/CN110629069A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101381824A (en) * | 2008-10-09 | 2009-03-11 | 苏州有色金属研究院有限公司 | Multi-aluminum bronze material for pipe |
| CN105586504A (en) * | 2016-03-08 | 2016-05-18 | 黄力 | Large shaft sleeve and casting method thereof |
Non-Patent Citations (1)
| Title |
|---|
| NWAEJU, C. C等: "Effect of manganese and niobium macro-additions on the structure and mechanical properties of aluminum bronze (Cu-10%Al) alloy", 《INTERNATIONAL JOURNAL OF RESEARCH IN ENGINEERING AND INNOVATION》 * |
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Application publication date: 20191231 |