CN1190282C - Alloy ingot casting pretreating process of preparing slurry for semi-solid formation - Google Patents
Alloy ingot casting pretreating process of preparing slurry for semi-solid formation Download PDFInfo
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- CN1190282C CN1190282C CNB021379343A CN02137934A CN1190282C CN 1190282 C CN1190282 C CN 1190282C CN B021379343 A CNB021379343 A CN B021379343A CN 02137934 A CN02137934 A CN 02137934A CN 1190282 C CN1190282 C CN 1190282C
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Abstract
The present invention relates to a method for preparing slurry for semi-solid formation by using an alloy ingot pretreating method. An alloy ingot which is regularly produced and have wide liquid and solid coexisting areas is heated in the temperature range of 150 DEG C below a solidus, is cooled to room temperature after heat preservation for 8 hours to 20 hours, and is heated again to the temperature range between the liquid and solid coexisting areas so that the slurry for semi-solid formation is obtained after heat preservation for 3 m to 6 m. the present invention has rich sources of raw material for preparing semi-solid blank without stirring treatment or adding refiner, etc. so as to simplify the production procedure, reduce the production cost of the semi-solid blank. The present invention has no limitation in dimension; at the time of semi-solid treatment, the ingot does not need to be melted; people do not need to worry about the oxidation and the burning of alloy liquid, and only need to perform pretreatment to alloy. The present invention can be implemented in general factories without special particular or special equipment.
Description
One, affiliated technical field
The present invention relates to a kind of technology for preparing semi-solid-state shaping with alloy pulp, particularly a kind of alloy ingot casting pretreating is equipped with the method for slurry for semi-solid formation.
Two, background technology
Semi-solid processing is the emerging technology of metal material heat processing, it comprises preparation, semi-solid metal slurry shaping of semi-solid metal slurry etc., it is applicable to the alloy system of the liquid-solid coexistence of broad, as aluminium alloy, magnesium alloy, kirsite, copper alloy and steel and alloy etc., in aluminium, magnesium alloy, obtained at present to use.
Semi-solid alloy slurry is to be made of the solid phase of some sub-circulars particle and the liquid phase of some, and it is solid-state, but can flow under external force or thixotropic forming.One of key technology in the semi-solid processing is exactly the technology of preparing of semisolid (or claiming non-dendritic structure) alloy pulp.Semi-solid alloy slurry is shaped the former reason David Spener of Massachusetts Institute Technology in the discovery seventies in 20th century, through the research and development of three more than ten years, has developed the technology of multiple preparation semi-solid-state shaping with alloy pulp; According to the characteristics of these technologies of preparing and the mechanism of formation microstructure of semisolid, they can be divided into following several big class:
1, dendrite fragmentation method in the metal bath.By making the dendrite fragmentation in the metal liquid that does not solidify fully someway, be graininess, obtain the microstructure of semisolid slurry after the cooling.This method has mechanical mixing method, electromagnetic stirring method, electromagnetic agitation to add fining agent method, rapid solidification method, ultrasonic facture etc.; Wherein electromagnetic stirring method can be realized continuous casting production, and the production efficiency height is the more a kind of method of using in the present suitability for industrialized production, and it produces diameter usually greater than the excellent base more than the 150mm.
2, strain-induced fusing activation method.Solid alloy is carried out enough cold deformations, be heated to two-phase section again and promptly get non-dendritic crystalline slurry for semi-solid formation.This method successfully is used for stainless steel, copper alloy, aluminium alloy and kirsite etc.But increased the cold deformation operation one, and can only prepare the blank of diameter less than 60mm.
3, spray deposition.Is drop by gas sprayer with atomization of liquid metal, and under the gas jet effect, the metal particle of partial coagulation deposits on the cooled target with semisolid, smashes its inner dendrite by the enough shearing forces of impact generation of semisolid particulate, forms non-dendritic structure.After heating again, obtain semi-solid metal slurry with spheric granules solid phase.This method applicable industry production at present, but its production cost is higher, only is applicable to some specialities.
4, semi-solid isothermal facture.In alloy liquid, add alterant in advance, obtain the crystalline tissue of withe after, be heated to two-phase section again and promptly form non-dendritic crystalline slurry for semi-solid formation.This method has been saved predeformation than strain-induced fusing activation method, has saved the step of special preparation microstructure of semisolid than dendrite fragmentation method in the metal bath.
5, other method.As powder metallurgic method, promptly make ingot blank by PM technique after, obtain semi-solid metal slurry through heating again after making low melting point become fractional melting.This method is specially adapted to refractory alloy.In addition, also have turbulence effect method, shearing-cooling-rolling, passive paddling process, impulse method etc.These methods are the same with the semi-solid isothermal facture, all are in laboratory stage, do not drop into industrial production as yet.
In the said method, what widely apply at present is electromagnetic stirring method, and it needs special equipment, and investment is big, usually can only production large scale blank; Strain-induced fusing activation method is mainly used in the higher metal of fusing point, as ferrous materials, because of it need carry out cold deformation in advance, uses lessly, is only applicable to the less situation of dimensional requirement; The semi-solid isothermal facture also is in laboratory stage, and this method need be in advance at melting ingot casting adding alterant, and alterant will influence the uniformity of microstructure of semisolid in the even distribution of melt.
Three, summary of the invention
The alloy ingot casting pretreating that promptly gets slurry for semi-solid formation in the two-phase section heat treated is equipped with the method for slurry for semi-solid formation after the object of the present invention is to provide a kind of alloy cast ingot that need not special equipment, only will produce usually to carry out preliminary treatment in solid-state scope, again.
The technical solution that realizes the object of the invention is: a kind of alloy ingot casting pretreating is equipped with the method for slurry for semi-solid formation, to there be the alloy cast ingot of the liquid-solid coexistence of broad in solidus and 150 ℃ of temperature ranges of subsolidus, to heat, after being incubated 8～20 hours, be cooled to room temperature, be heated to the temperature range between the liquid-solid coexistence again, promptly get slurry for semi-solid formation through 3～60min insulation.
The type of cooling of the present invention can be water-cooled, oil cooling or air cooling.
The present invention compared with prior art, its remarkable advantage is: 1, the raw materials used source of preparation semi-solid blank is abundant, is the ingot casting of ordinary production, need not carry out stir process or add fining agent etc. metal liquid, simplify production process, reduced the production cost of semi-solid blank; 2, no size restrictions: the size of semi-solid blank depends on the size of ingot casting, and the ingot casting size is unrestricted; When 3, carrying out the semisolid processing, do not need the ingot casting fusing be need not to worry oxidation, the burning of alloy liquid; 4, only need alloy is carried out preliminary treatment, need not special or special equipment, all can implement in general factory.
Four, description of drawings
Fig. 1 is the schematic flow sheet that alloy ingot casting pretreating of the present invention is equipped with the slurry for semi-solid formation method.
Fig. 2 is without (570 ℃ * 30min) comparison diagram in water-cooled tissue after the two-phase section heating of pretreated AZ91D and pretreated AZ91D of the present invention.
Five, the specific embodiment
Below in conjunction with accompanying drawing the present invention is further described.
In conjunction with Fig. 1, Fig. 2, the present invention is raw materials used to be alloy cast ingot ordinary production, that the liquid-solid coexistence of broad is arranged, as magnesium alloy AZ91 etc., aluminium alloy AlSi7Mg etc., copper alloy and other coloured and ferrous material, when ingot casting, do not need metal liquid is carried out preliminary treatment or adds fining agent or blank is carried out predeformation; When semisolid is handled, do not need the ingot casting fusing, only the ingot casting to common production carries out preliminary treatment in solid-state scope; Be heated to uniform temperature again through pretreated blank, and can directly carry out various shaping processing, as semi-solid rolling, semisolid extruding, semisolid die casting, semisolid forging etc. in this temperature.Step is to heat in solidus and 150 ℃ of temperature ranges of subsolidus, is cooled to room temperature after being incubated 8～20 hours, is heated to the temperature range between the liquid-solid coexistence again, promptly gets slurry for semi-solid formation through 3～60min insulation.As apply the present invention to the AZ91D magnesium alloy ingot, implementation step is as follows:
The first step: buying or melting on demand makes raw material, and these raw materials are promptly as alloy cast ingot, buys as embodiment and obtains the AZ91D magnesium alloy ingot;
Second step: after magnesium alloy ingot preliminary treatment, resistance furnace are warming up to 415 ℃, the AZ91D magnesium alloy is put into stove, treat to begin to be incubated timing after furnace temperature goes back up to 415 ℃, temperature retention time is 20 hours; After reaching temperature retention time, the taking-up magnesium alloy ingot is put into water and is cooled off;
The 3rd step: it is 570 ℃ resistance furnace that above-mentioned pretreated magnesium alloy ingot is put into furnace temperature again, begins to be incubated timing after furnace temperature goes back up to 570 ℃, and temperature retention time is 30min, so promptly obtains required magnesium alloy semisolid slurry.
The tissue and the unpretreated magnesium alloy ingot water-cooled gained tissue after same two-phase section heating that the present invention are used for after the semi solid slurry water-cooled of gained behind the magnesium alloy ingot compare.What obtain under two kinds of conditions organizes as shown in Figure 2.As can be seen from Figure 2: 1, Fig. 2 (a) is that unpretreated magnesium alloy ingot is through the resulting tissue of water-cooled behind 570 ℃ of insulation 30min.Solid phase in its tissue has still kept the dendritic morphology of basic stitch, does not take place to transform to subsphaeroidal shape.Be unpretreated magnesium alloy ingot after the two-phase section heating, can not obtain the microstructure of semisolid that solid phase is subsphaeroidal particle; 2, Fig. 2 (b) is through 415 ℃ of pretreated magnesium alloys, the resulting tissue of water-cooled behind 570 ℃ of insulation 30min.Significant change has taken place solid phase in its tissue: solid phase is subsphaeroidal shape.Be pretreated magnesium alloy ingot after the two-phase section heating, can obtain the microstructure of semisolid that solid phase is subsphaeroidal particle.
Claims (3)
1, a kind of alloy ingot casting pretreating is equipped with the method for slurry for semi-solid formation, to there be the alloy cast ingot of the liquid-solid coexistence of broad in solidus and 150 ℃ of temperature ranges of subsolidus, to heat, after being incubated 8～20 hours, be cooled to room temperature, be heated to the temperature range between the liquid-solid coexistence again, through 3～60min be incubated slurry for semi-solid formation.
2, alloy ingot casting pretreating according to claim 1 is equipped with the method for slurry for semi-solid formation, it is characterized in that: the type of cooling is water-cooled or oil cooling or air cooling.
3, alloy ingot casting pretreating according to claim 1 and 2 is equipped with the method for slurry for semi-solid formation, it is characterized in that: alloy cast ingot is magnesium alloy, aluminium alloy, copper alloy or other coloured and ferrous material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021379343A CN1190282C (en) | 2002-07-11 | 2002-07-11 | Alloy ingot casting pretreating process of preparing slurry for semi-solid formation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021379343A CN1190282C (en) | 2002-07-11 | 2002-07-11 | Alloy ingot casting pretreating process of preparing slurry for semi-solid formation |
Publications (2)
| Publication Number | Publication Date |
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| CN1389315A CN1389315A (en) | 2003-01-08 |
| CN1190282C true CN1190282C (en) | 2005-02-23 |
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| CNB021379343A Expired - Fee Related CN1190282C (en) | 2002-07-11 | 2002-07-11 | Alloy ingot casting pretreating process of preparing slurry for semi-solid formation |
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| CN114082801B (en) * | 2021-11-22 | 2024-01-02 | 昆明理工大学 | Continuous semi-solid forming method and device for copper-clad steel composite material |
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