CN103639413A - Method for manufacturing high-performance complex aluminum alloy part - Google Patents
Method for manufacturing high-performance complex aluminum alloy part Download PDFInfo
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- CN103639413A CN103639413A CN201310645711.XA CN201310645711A CN103639413A CN 103639413 A CN103639413 A CN 103639413A CN 201310645711 A CN201310645711 A CN 201310645711A CN 103639413 A CN103639413 A CN 103639413A
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Abstract
The invention relates to a method for manufacturing a high-performance complex aluminum alloy part. The powder-forming idea is adopted by the method so that a mini-type part can be manufactured and a large-size part can also be formed. The mechanical property of the part is far higher than that of a powder metallurgy sintering piece; the shortage that the large-size part cannot be manufactured through an SIMA method is overcome; accurate forge touching forming of the parts can be achieved.
Description
Technical field
Patent of the present invention relates to a kind of preparation method of high-performance Complex Aluminum Alloy part.
Background technology
Preparation for Complex Aluminum Alloy part, main employing cast and two kinds of methods of die casting at present, its acquisition be organized as thick dendrite, the tissue of material, density and hardness are very inhomogeneous, although the later stage heat-treats part, but mechanical property is compared with forging and is still differed many, has limited its application as main load-carrying construction part.Semi-solid-state metal processing is an a kind of near-net-shape finished pieces with complex shapes technology of new development, and its product mechanical property approaches forging.Rotten processing and rapid solidification all can improve the heterogeneous microstructure of alloy and improve its performance, this technology adopts the rotten spherocrystal aluminum alloy granule that the method combining with rapid solidification obtains nonequilibrium condition of processing, cold pressing, heat the semisolid blank that obtains being suitable for thixotropic forming, this blank has good mobility and ductility under pressure, part that can shaped structure complexity, and part mechanical property is higher, approaches forging.
Summary of the invention
The object of patent of the present invention is to provide a kind of preparation method of high-performance aluminium alloy part, and its feature is comprising the following steps:
Step 1, by alloy pig in approximately 8000 ℃ of left and right meltings, when alloy pig is all transformed into after liquid phase by solid phase, add superfine rare-earth element, described superfine rare-earth element comprises Nd, La and Pr, described Nd, the mass ratio of La and Pr is about 4:2:1, and the quality of described superfine rare-earth element is about 2% of alloy pig quality, be incubated 3 minutes, described alloy pig is aluminium alloy ingots;
Step 2, adds refining agent by 2～3 grams of consumptions of every kg aluminium liquid, stirs, and refining 2～3 minutes, scoops out the scum silica frost on liquid metal surface with spoon.Described refining agent is 44% sodium chloride+54% potassium chloride+2% calcirm-fluoride.
Step 3, passes into gases at high pressure atomized molten material, and then cooling, cooling velocity is about 10
2-10
3℃/S, form powder, described powder diameter is 50-90 μ m, the protection gas of described gases at high pressure is N
2.
Step 4, by the prepared powder of step 3, becomes base according to the product shape powder of colding pressing, and the gained base relative density of colding pressing reaches more than 85%;
Step 5, the base of colding pressing that step 4 is made is put into incubator isothermal heat treated, and holding temperature, between the eutectic temperature and liquidus temperature of alloy, determines temperature retention time according to billet size, and described temperature retention time is calculated according to following formula:
Described incubator is N in being
2atmosphere.
Step 6:
Prepared blank clamping in step 5 is put into forging die, and pressurization closed die forging obtains high-performance aluminium alloy product, and described forging die temperature is 200～3000 ℃.
Forging die top layer graphite spraying-oil lubricant in described step 6.
Beneficial effect:
1. the complexity of the part shape that prepared by employing the method can be suitable with foundry goods, and mechanical property approaches forging;
2. this preparation method adopts the theory of powder forming, can prepare miniature parts, also can realize the shaping of large-scale part, and the mechanical property of part is far above powder metallurgy sintered product;
3. overcome strain inducing melt activation method (SIMA) and can not realize defect prepared by large-scale part;
4. the precision that can realize part is touched and to be swaged into shape.
The specific embodiment
Below in conjunction with specific embodiment, further set forth the present invention.
A preparation method for high-performance aluminium alloy part, its feature is comprising the following steps:
A preparation method for high-performance aluminium alloy part, its feature is comprising the following steps:
Step 1, by alloy pig in approximately 8000 ℃ of left and right meltings, when alloy pig is all transformed into after liquid phase by solid phase, add superfine rare-earth element, described superfine rare-earth element comprises Nd, La and Pr, described Nd, the mass ratio of La and Pr is about 4:2:1, and the quality of described superfine rare-earth element is about 2% of alloy pig quality, be incubated 3 minutes, described alloy pig is aluminium alloy ingots;
Step 2, adds refining agent by 2～3 grams of consumptions of every kg aluminium liquid, stirs, and refining 2～3 minutes, scoops out the scum silica frost on liquid metal surface with spoon.Described refining agent is 44% sodium chloride+54% potassium chloride+2% calcirm-fluoride.
Step 3, passes into gases at high pressure atomized molten material, and then cooling, cooling velocity is about 10
2-10
3℃/S; form powder; described powder diameter is 50-90 μ m; the protection gas of described gases at high pressure is N2; here employing is extremely cold, and originally liquid metal is atomized into minimum particle by high pressure convection gas, encounters the cooling chamber wall of water circulation and by liquid state, is become immediately solid-state; cooling velocity is very fast, also therefore forms non-equilibrium microstructure.
Step 4, by the prepared powder of step 3, becomes base according to the product shape powder of colding pressing, and the gained base relative density of colding pressing reaches more than 85%;
Step 5, the base of colding pressing that step 4 is made is put into incubator isothermal heat treated, and holding temperature, between the eutectic temperature and liquidus temperature of alloy, determines temperature retention time according to billet size, and described temperature retention time is calculated according to following formula:
Described incubator is N in being
2atmosphere.
Step 6:
Prepared blank clamping in step 5 is put into forging die, and pressurization closed die forging obtains high-performance aluminium alloy product, and described forging die temperature is 200～3000 ℃.
Forging die top layer graphite spraying-oil lubricant in described step 6.
Embodiment mono-:
One, the preparation of 6061 aluminum alloy high-performance complex parts
1,6061 aluminium alloy ingots are put into crucible, the crucible that aluminium alloy ingots is housed is put into the holding furnace that is connected with protection gas, 8000 ℃ of left and right meltings, after aluminium alloy ingots melts completely, add containing Nd, the mass ratio of La and Pr is about the superfine rare-earth of 4:2:1, stir, be incubated 3 minutes;
2, in 6061 aluminium liquid of step 1 gained, by 2～3 grams of consumptions of every kg aluminium liquid, add refining agent, refining agent composition is 44% sodium chloride+54% potassium chloride+2% calcirm-fluoride, stirs, and is incubated 2～3 minutes, with spoon, the scum silica frost on liquid metal surface is scooped out;
3,6061 aluminium liquid of step 2 gained are poured in rapid solidification atomising device, about 8000 ℃ insulations 2 minutes, passed into high pressure nitrogen injection, convection current atomization, be rapidly solidificated into the Al alloy powder with non-equilibrium microstructure;
4, according to part quality, take the Al alloy powder of corresponding steps three gained, put into cold stamping die, under certain pressure, suppress, obtain more than 85% blank of colding pressing of relative density;
5, mainly in 6061 aluminium alloys have two kinds of eutectic phases, wherein the eutectic temperature of Al-Si is 577 ℃, and the eutectic temperature of Al-Mg2Si is 595 ℃, and liquidus temperature is 652 ℃, thus we to choose semi-solid isothermal heat treated temperature be 615 ℃.The blank of colding pressing of step 4 gained is put into the holding furnace that is connected with protection gas, holding furnace temperature is made as 615 ℃ of constant temperature, and insulation certain hour has fine drop to occur but aneroid stream while flowing down when observing blank surface, and semisolid insulation is finished dealing with;
6, the blank of step 5 gained is sent in thixotroping forging mold with round mouth tongs clamping, forging die is heated to 200～3000 ℃ and be incubated certain hour in advance, and in impression graphite spraying-oil lubricant, starting pressure machine thixotroping moulding obtains high performance complicated 6061 aluminum alloy parts.
The preparation of bis-: 7090 aluminum alloy high-performance complex parts of embodiment
Identical with 6061 aluminum alloy part preparation processes, different is that semi-solid isothermal treatment temperature becomes 625 ℃ in step 5.
The performance of 6061 aluminium alloys and 7090 aluminum alloy parts
| Alloy (longitudinally sampling) | σ b(MPa) | σ 0.2(MPa) | δ(％) |
| 6061 | 301 | 263 | 8 |
| 7090 | 618 | 579 | ll |
Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Claims (2)
1. a preparation method for high-performance aluminium alloy part, its feature is comprising the following steps:
Step 1, by alloy pig in approximately 8000 ℃ of left and right meltings, when alloy pig is all transformed into after liquid phase by solid phase, add superfine rare-earth element, described superfine rare-earth element comprises Nd, La and Pr, described Nd, the mass ratio of La and Pr is about 4:2:1, and the quality of described superfine rare-earth element is about 2% of alloy pig quality, be incubated 3 minutes, described alloy pig is aluminium alloy ingots;
Step 2, adds refining agent by 2～3 grams of consumptions of every kg aluminium liquid, stirs, and refining 2～3 minutes, scoops out the scum silica frost on liquid metal surface with spoon.Described refining agent is 44% sodium chloride+54% potassium chloride+2% calcirm-fluoride;
Step 3, passes into gases at high pressure atomized molten material, and then cooling, cooling velocity is about 10
2-10
3℃/S, form powder, described powder diameter is 50-90 μ m, the protection gas of described gases at high pressure is N
2;
Step 4, by the prepared powder of step 3, becomes base according to the product shape powder of colding pressing in cold stamping die, brushes zinc stearate lubricated before colding pressing on cold stamping die surface, and the gained base relative density of colding pressing reaches more than 85%;
Step 5, the base of colding pressing that step 4 is made is put into incubator isothermal heat treated, and holding temperature, between the eutectic temperature and liquidus temperature of alloy, determines temperature retention time according to billet size, and described temperature retention time is calculated according to following formula:
Described incubator is N in being
2atmosphere;
Step 6:
Prepared blank clamping in step 5 is put into forging die, and pressurization closed die forging obtains high-performance aluminium alloy product, and described forging die temperature is 200～3000 ℃.
2. the preparation method of a kind of high-performance aluminium alloy part as claimed in claim 1, is characterized in that forging die top layer graphite spraying-oil lubricant in described step 6.
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|---|---|---|---|
| CN201310645711.XA CN103639413A (en) | 2013-12-06 | 2013-12-06 | Method for manufacturing high-performance complex aluminum alloy part |
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| CN201310645711.XA CN103639413A (en) | 2013-12-06 | 2013-12-06 | Method for manufacturing high-performance complex aluminum alloy part |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108866360A (en) * | 2018-07-16 | 2018-11-23 | 长沙博朗思达新材料科技有限公司 | A kind of preparation method of Al-Si composites used for electronic packaging |
-
2013
- 2013-12-06 CN CN201310645711.XA patent/CN103639413A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108866360A (en) * | 2018-07-16 | 2018-11-23 | 长沙博朗思达新材料科技有限公司 | A kind of preparation method of Al-Si composites used for electronic packaging |
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Application publication date: 20140319 |