CN100421841C - Preparation method of composite shear semi-solid metal rheological slurry - Google Patents
Preparation method of composite shear semi-solid metal rheological slurry Download PDFInfo
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Abstract
一种复合剪切半固态金属流变浆料的制备方法，包括：(1)将合金液控制在液相线温度TL以上的0-100℃范围内；(2)将上搓板的温度控制在TL-40℃～TL+20℃范围内，并将下搓板的上端的温度控制TL-50℃～TL+50℃范围内，下端的温度控制在TSS-20℃～TSS+20℃，下搓板的从其上端到下端的温度梯度控制为0.03-1℃/mm；(3)将合金液导入下搓板上，在合金液压上上搓板，由施压缸通过上搓板对下搓板形成压强；(4)上搓板压载着合金液滑动到到吐料单元中，保温后，合金液凝固为含有球状或粒状初晶的半固态金属浆料。该方法适合于铝基合金、镁基合金、铜基合金、锌基合金、镍基合金、钴基合金和铁基合金球状或粒状初晶的半固态浆料或连铸坯料的制备。
A method for preparing compound shear semi-solid metal rheological slurry, comprising: (1) controlling the alloy liquid in the range of 0-100°C above the liquidus temperature T L ; (2) controlling the temperature of the upper washboard In the range of T L -40℃～T L +20℃, and the temperature of the upper end of the lower washboard is controlled within the range of T L -50℃～T L +50℃, and the temperature of the lower end is controlled at T SS -20℃～T SS +20℃, the temperature gradient from the upper end to the lower end of the lower washboard is controlled to be 0.03-1℃/mm; (3) The alloy liquid is introduced into the lower washboard, and the upper washboard is put on the alloy hydraulic pressure, and the pressure cylinder passes through the upper washboard Form pressure on the lower washboard; (4) The upper washboard slides the alloy liquid into the discharge unit with ballast. After heat preservation, the alloy liquid solidifies into a semi-solid metal slurry containing spherical or granular primary crystals. The method is suitable for the preparation of semi-solid slurry or continuous casting billet of spherical or granular primary crystals of aluminum-based alloys, magnesium-based alloys, copper-based alloys, zinc-based alloys, nickel-based alloys, cobalt-based alloys and iron-based alloys.
Description
Technical field
The present invention relates to a kind of temp-control quantitative cast and combination shearing power and apply the preparation method who contains the semi-solid metal slurry of spherical or granular primary crystal with preparation.
Background technology
Since the spherical or granular primary crystal semi-solid state forming technique of metal and alloy has been invented by early seventies Massachusetts Institute Technology in last century (MIT), countries in the world are to the semi-solid state forming technique extensive concern and carried out big quantity research, now are applied in the actual production gradually.This is because this The Application of Technology has following outstanding advantage:
(1), alleviate and wrap up in tolerance and solidification shrinkage amount in the forming process, improve the compactness and the intensity of blank;
(2), alleviate component segregation, the uniformity of raising blank tissue and performance;
(3), formability is good, is convenient to make the blank of complex parts;
(4), enhance productivity the rate of reducing the number of rejects and seconds;
(5), reduce and to fill the type temperature, prolong die life;
(6), be convenient to realize the production automation.
The method of the spherical or granular primary crystal semi-solid metal slurry of preparation mainly contains mechanical mixing method, electromagnetic stirring method, strain activation method, liquidus curve casting, powder method etc. at present.Wherein using maximum is electromagnetic stirring method.But there are significant drawback such as easy volume gas, tissue odds spare in electromagnetic stirring method.In general, the technology of preparing of spherical or granular primary crystal semi-solid metal slurry does not still reach the requirement of Semi-Solid Metals Forming The Application of Technology.
In numerous mechanical mixing methods, the double helix method of the inventions such as FAN professor Zhongyun of Britain Brunel university can provide enough big shearing force, can obtain the metal semi-solid slurry (S.JI of well spherical or granular primary crystal, Z.FAN, M.J.BEVIS.Mater.SciEng., 2001, A299,210-217; BP 9922696.3).But the double helix blade in this device contacts with the metal bath of high temperature closely owing to double helix in the pulp preparation process, and helical blade is thinner, causes the damage of double auger system easily, so the preparation cost of metal semi-solid slurry is higher.
United States Patent (USP) discloses the mechanical mixing method of several preparation metal semi-solid slurries for the 3902544th, 3948650 and No. 3954455.Method in the patent mainly is to utilize rotating vane or the stirring rod nascent solid phase dendrite in will solidifying to smash, and obtains the metal semi-solid slurry of spherical or granular primary crystal.Because contact area is big, time of contact is long, the life-span of teeter chamber and stirring rod is short, the easy oxidation of metal, poor-performing but generally.
United States Patent (USP) discloses the electromagnetic stirring method of several preparation metal semi-solid slurries for the 4229210th, No. 4434837.Electromagnetic stirring method is to utilize strong electromagnetic induction power to suppress separating out of primary dendrite, prepares the metal semi-solid slurry of spherical or granular primary crystal.The shear rate that electromagnetic agitation produced in this method is generally at 500～1500S
-1, the rotary speed of the feasible molten metal that is stirred is very high, generally all greater than 500rpm.But reach above requirement, employed equipment is general huger, and investment is high, and energy consumption is big, efficient is low.So production cost is higher.In addition, Chinese patent is mentioned by thermostatically controlled screw rod for No. 97120579.5 and is provided lasting shearing force to overheated liquid metal, makes alloy melt cool off it fast between the solid-liquid coexistence in shear history, forms a kind of semi solid slurry.And in the preparation of drum-type semi-solid metal slurry and former of (the number of patent application 01109074.X) such as Kang Yonglin of University of Science ﹠ Technology, Beijing invention, mainly utilize inner/outer tube to relatively rotate and cause that the interior friction of melt provides a shearing force to realize the semi-solid metal slurry preparation.These methods since screw rod or rotating cylinder be fully immersed in the alloy melt, so can there be the problem of Screw Corrosion and melt contamination equally.
And the shearing force that European patent EP 0745694A1 (being commonly referred to the slope method) only utilizes melt friction in slope current following time to provide prepares semi solid slurry.There are not the relevant issues such as erosion of agitator in this method.But the interior friction stir power that this method can provide is less relatively, may cause can not obtaining desirable alloy structure under some situation.
Summary of the invention
The object of the present invention is to provide a kind of efficient, desirable preparation method of spherical or granular primary crystal semi-solid metal slurry.Can obtain tiny, the equal semi-solid-state metal tissue of even spherical or granular primary crystal of crystal grain by preparation method of the present invention.
For achieving the above object, the present invention takes following technical scheme:
A kind of preparation method of composite shearing semi-solid state metal rheological slurry is characterized in that: this method comprises the steps:
(1), with the alloy hydraulic control built in liquidus temperature T
LIn the 0-100 ℃ of above scope;
(2), adopt to squeeze rub the unit with the hands, this squeezes to rub with the hands in unit and includes upper and lower washboard, last washboard is short washboard with respect to washboard down, and the washboard for sliding on washboard down, and goes up washboard and by the cylinder control of exerting pressure following washboard is formed pressure; Following washboard is long washboard with respect to last washboard, and for become the fixedly washboard at angle of inclination with horizontal plane, last washboard is 200-1500mm playing the sliding length on the washboard, and the temperature of last washboard is controlled at T
L-40 ℃～T
LIn+20 ℃ of scopes, and will play the temperature of the upper end of washboard to control T
L-50 ℃～T
LIn+50 ℃ of scopes, the temperature of lower end is controlled at T
Ss-20 ℃～T
SsIn+20 ℃ of scopes, wherein, T
SsExpression semi-solid processing temperature, T
SsBetween liquidus temperature T
LWith solidus temperature T
sBetween, following washboard be controlled to be 0.03-1 ℃/mm to the thermograde of lower end from its upper end;
(3), with on the washboard under the importing of alloy liquid, and on the alloy hydraulic pressure washboard, and by last washboard following washboard is formed the pressure of 0～10MPa by the cylinder of exerting pressure, and pressure ≠ 0, to go up the washboard ballast again and alloy liquid from the lower end slip of the downward washboard in upper end of washboard down, sliding time is 100～5000ms;
(4), when going up the washboard ballast and alloy liquid and slide into down the lower end of washboard, alloy liquid flow into to be told in the material unit, is incubated in telling material unit, the temperature of insulation is controlled at T
Ss-5 ℃～T
SsIn+5 ℃ of scopes, after the insulation, alloy liquid is solidified as the semi-solid metal slurry that contains spherical or granular primary crystal.
This method has improved the degree of superheat of molten metal in the near liquidus casting, over-heat metal liquid solidifies under the effect of the working region interlayer shear power that miscarriage is given birth to through the interior layer of fluid own and two kinds of shearing forces of applying shearing force, can obtain tiny, the equal semi-solid-state metal tissue of even spherical or granular primary crystal of crystal grain.Simultaneously, the relative motion of washboard also has certain homogenising, helps diffusion and melt Conveying effect up and down.
In the preparation method of spherical or granular primary crystal semi-solid metal slurry of the present invention, this method also comprises the steps:
(5), will flow into the semi solid slurry told in the material unit after insulation, the effect by squeeze cylinder is injected into mold or imports in the continuous cast mold, makes this semi-solid metal slurry that contains spherical or granular primary crystal be frozen into foundry goods or continuous casting material.
In the preparation method of spherical or granular primary crystal semi-solid metal slurry of the present invention, described washboard down becomes the angle of inclination with horizontal plane be 0～75 °, and ≠ 0.And can regulate in this range of tilt angles according to other technological parameter.
In the preparation method of spherical or granular primary crystal semi-solid metal slurry of the present invention, the described gap of washboard up and down is 0～30mm, and ≠ 0.
Process of the present invention and principle are as follows:
(1), alloy material that composition is qualified fusing and make the alloy liquation have the suitable degree of superheat.Utilize the temperature of the stable control of heater block and cooling-part over-heat metal liquid;
(2), quantitative over-heat metal liquid is watered on the following washboard with suitable temperature gradient continuously equably; Make molten metal under the gravity effect with certain width along following washboard with gradient to dirty.At this moment, because the melt internal flow exists velocity gradient to cause the interior friction of melt, thereby produce a shearing force F1.From technology controlling and process, the gradient of following washboard, last washboard sliding length, sliding time have determined shearing force F1.
(3), in good time start the transmission system and the cylinder of exerting pressure of going up washboard, and rationally adjust the movement velocity that goes up washboard and the pressure between washboard up and down.The relative motion of washboard makes melt inside produce a stronger shearing force F2 about under the impressed pressure.From technology controlling and process, the pressure of the cylinder of exerting pressure has determined shearing force F2.
The stack of shearing force F1 and F2 means alloy liquid has been applied combination shearing power F.Be shearing force F mainly by the flow velocity (or going up washboard sliding length and sliding time) of the gradient of following washboard, alloy liquid and up and down the relative motion under the washboard certain pressure cause that interior fricative two shearing forces of melt are formed by stacking.
More than two shearing force F1 and F2 compound be shearing force F to the molten metal effect, the group's nodularization crystallization that promotes alloy also/or broken its primary crystal in dendrite, primary crystal is bent and broken under the shearing force effect, and collides, gathers, merges growth mutually.In addition, combination shearing power F helps the migration and the diffusion of the mobile of slurry and the interior atom of melt, thereby reduces the inhomogeneities of morphological element and the air content in the melt, also helps hindering formation, the inhibition grain growth of dendrite.Alloy melt is cooled between its solid-liquid coexistence with suitable cooling velocity in this shear history, forms semi solid slurry.Then, flow in the insulation mould;
(4), will flow into the semi solid slurry insulation certain hour of mould after, under the effect of squeeze cylinder, be injected into mold or import in the continuous cast mold;
(5), this semi-solid metal slurry that contains spherical or granular primary crystal is frozen into foundry goods or continuous casting material.Like this, according to the different-alloy requirement, extruding force by regulating squeeze cylinder and stroke and mould are opened process combination such as time and quenching condition, obtain the semi-solid alloy blank and the foundry goods of tissue excellence.
The invention has the advantages that: the advantage of having developed the slope method, washboard has been strengthened simple slope method to the extruding and the kneading action of melt about utilizing mixing power and shearing force, avoid electromagnetic agitation and big, the inefficient shortcoming of some mechanical agitation energy consumption, be more conducive to obtain spherical or granular primary crystal semi-solid metal slurry.
The advantage of the inventive method is: the Controllable Temperature of metal bath is good, promptly is convenient to control the flowability of over-heat metal liquid; Be convenient to prepare in a large number, continuously the high-quality semi solid slurry of spherical or granular primary crystal; This method and apparatus can directly combine directly production semisolid part with die casting machine, also can realize vertical or horizontal casting with the preparation semi-solid blank; This method and apparatus both had been suitable for the semi-solid metal slurry of spherical or granular primary crystal of acieral or the preparation of continuous casting material, also was suitable for magnesium base alloy, acid bronze alloy, zinc-containing alloy, nickel-base alloy, cobalt-base alloys and ferrous alloy spherical or the semi solid slurry of granular primary crystal or the preparation of continuous casting material.
Need to prove and when utilizing this device production semisolid part, will add simple slurry switching device or corresponding cooperation transformation.When utilizing this device to carry out vertical or horizontal casting during, also to carry out supporting connection with the preparation semi-solid blank.
Description of drawings
Fig. 1 is the organigram of the preparation facilities of the present invention-composite shearing semi-solid state metal rheological slurry or continuous casting material.
Fig. 2 is A357 alloy casting state and semi solid structure photo, and wherein, Fig. 2 (a) is an A357 alloy casting state metallographic structure photo, and Fig. 2 (b) is an A357 alloy semi solid structure photo.
The specific embodiment
As shown in Figure 1, Fig. 1 is the organigram of the preparation facilities of the present invention's one composite shearing semi-solid state metal rheological slurry or continuous casting material.This preparation facilities comprises dosage unit, squeezes and rub the unit with the hands and tell three unit of material unit.As shown in Figure 1, dosage unit comprises melting furnace 1, holding furnace 2 and tundish 3, and wherein, melting furnace 1 can make up with holding furnace 2 and tundish 3 respectively.Melting furnace 1 is a common apparatus; All be respectively equipped with heater block and cooling-part in the wall of holding furnace 2 and tundish 3, the cooling medium of cooling-part can be water or air.By the melting furnace 1 alloy material fusing that composition is qualified, be transported to holding furnace 2 insulations again, and then be transported to tundish 3, by holding furnace 2, tundish 3, utilize the stable temperature of controlling thermalloy liquid of heater block and cooling-part; After alloy liquid melt temperature is stabilized in predetermined temperature and keeps certain hour, by the stopper rod controlling organization stopper rod 6 is extracted, thermalloy liquid melt is exporting on the following washboard 10 by stem bar under the gravity effect excessively.
By the heater block in holding furnace 2 and the tundish 3 and the comprehensive function of cooling-part, guaranteed the stable control of thermalloy liquid temp.Reach predetermined temperature and the uniform alloy liquid of composition and so enter workspace (promptly squeeze and rub the unit with the hands).
As shown in Figure 1, squeeze to rub with the hands and to include washboard 9, washboard 10 down in the unit, last washboard 9 is short washboard with respect to washboard 10 down, and can slide on the washboard 10 down, and goes up washboard 9 and controlled by the cylinder 10 of exerting pressure following washboard 10 is formed pressure; Following washboard 10 is long washboard with respect to last washboard 9, and become the angle of inclination with horizontal plane, in last washboard 9, following washboard 10, all be respectively equipped with heater block and cooling-part, the outlet of dosage unit is the upper end that the stem bar of tundish 3 connects down washboard 10, and the described import of telling material unit of the following termination of following washboard 10 promptly is incubated the import of mould.
In last washboard 9 and play washboard 10, all be respectively equipped with heater block and cooling-part, the requirement of arriving the thermograde of lower end from its upper end with the temperature of the upper and lower end of protecting the temperature that just going up washboard 9, time washboard.
As shown in Figure 1, tell that material unit comprises insulation mould 13 and in order to the squeeze cylinder 12 of the alloy flow quantity in the control insulation mould, insulation mould 13 is provided with import and export, its import as the import of telling material unit with described under the lower end of washboard join.
As shown in Figure 1, quantitative over-heat metal liquid is watered continuously equably on the following washboard with suitable temperature gradient 10; Make alloy liquid under the gravity effect with certain width along following washboard 10 with gradient to dirty, start the slider-crank mechanism 18 of going up washboard 9 and the cylinder 11 of exerting pressure in good time, and rationally adjust the pressure of 10 of the movement velocity that goes up washboard 9 and last washboard 9, time washboards, therefore, should squeeze the applying shearing force that the unit can provide the interlayer shear power of giving birth to except that the interior layer miscarriage of fluid own, i.e. the combination shearing power of rubbing with the hands.By adjusting down washboard 10 gradients and the cylinder 11 pressure adjustment of exerting pressure of exerting pressure, controllability is strong within the specific limits for this combination shearing power, in addition, and melt under the effect of combination shearing power, be more convenient for preparing in a large number, the continuously semi solid slurry of spherical or granular primary crystal.Like this, under the effect of combination shearing power, alloy melt is quickly cooled between the solid-liquid coexistence, forms semi solid slurry, and under last washboard 9 ballasts slide, flows in the insulation mould 13.After flowing into the semi solid slurry insulation certain hour of insulation mould 13, under the effect of squeeze cylinder 12, be injected in mold or the importing continuous cast mold.Tell material unit and both can dock with die casting equipment, also can independently working.Whole device can be realized working continuously and the production in enormous quantities of semi-solid blank.According to the different-alloy requirement, extruding force by regulating squeeze cylinder and stroke and mould are opened process combination such as time and quenching condition, obtain the semi-solid alloy blank of tissue excellence.
Embodiment 1:
The liquidus temperature of the A357 alloy that is adopted is 615 ℃; The gradient of the following washboard that is adopted is 50 °, go up washboard sliding length 500mm, go up the sliding time 1.5S of washboard.
Overheated A357 alloy liquid accurately is controlled at 690 ± 3 ℃ of scopes; Quantifying feed 1～1.2Kg; After last washboard is preheated to 575～585 ± 5 ℃, thermostatic control; To the upper end, temperature is the gradient temperature field from 575 ℃ to 650 ℃ from the lower end in following washboard formation.Last washboard is 7Mpa to the pressure of following washboard.The shear time of control slurry is 0.8～1.2s.The T of A357 alloy
Ss=575 ℃.With slurry the insulation mould in about 577 ± 3 ℃ be incubated 3.5～5min, with control alloy pulp fraction solid between 0.4～0.6.After the semi solid slurry of preparation is abundant, semi solid slurry is expressed to the bar-shaped sample of preparation experiment in the cast iron mould by squeeze cylinder.To previously prepared alloy casting state tissue with adopt the microstructure of semisolid of this technology preparation to carry out metallographic structure and observe.
Fig. 2 is A357 alloy casting state and semi solid structure photo, and wherein, Fig. 2 (a) is an A357 alloy casting state metallographic structure photo, and Fig. 2 (b) is an A357 alloy semi solid structure photo.
The result shows: the microstructure of semisolid that adopts this technology to prepare the A357 alloy contains a large amount of ring initial crystals, proves that shear action has not only changed the form of matrix phase, and has changed the distribution of phase and played the effect of refinement.The semisolid sample is processed into the standard specimen of Φ 12 * 55 and carries out Mechanics Performance Testing.The result is as follows: tensile strength is 225MPa, and percentage elongation is 8%.Above result shows that this semisolid A356 alloy structure that contains ring initial crystal meets the requirements fully, reaches desirable effect.
Embodiment 2:
The magnesium alloy materials light weight is an example with AZ91D commonly used, and its proportion is 1.8, only is 1/4th of iron and steel, about 2/3rds of aluminium alloy.Compare with general common metal, magnesium alloy has higher specific rigidity, specific strength, machinability, damping, thermal conductivity and many advantages such as recyclable, also has the characteristic of anti electromagnetic wave in addition.Under environmental protection and light-weighted trend, magnesium alloy workpiece is widely used on 3C Product and the automobile gradually in recent years.
The liquidus temperature of the AZ91D magnesium alloy that is adopted is 595 ℃; The T of AZ91D magnesium alloy
Ss=570 ℃; The gradient of the following washboard that is adopted is 45 °, go up washboard sliding length 480mm, go up the sliding time 1.5S of washboard.
Overheated AZ91D alloy liquid accurately is controlled at 610～680 ℃ of scopes; Quantifying feed 1～1.0Kg; After last washboard is preheated to 555～565 ± 5 ℃, thermostatic control; To the upper end, temperature is the gradient temperature field from 575 ℃ to 610 ℃ from the lower end in following washboard formation.Last washboard is 5Mpa to the pressure of following washboard.The shear time of control slurry is 1.0～1.5S.With slurry the insulation mould in about 568 ± 3 ℃ be incubated 3～5min, with control alloy pulp fraction solid between 0.4～0.5.After the semi solid slurry of preparation is abundant, semi solid slurry is expressed to the bar-shaped sample of preparation experiment in the cast iron mould by squeeze cylinder.To previously prepared alloy casting state tissue with adopt the microstructure of semisolid of this technology preparation to carry out metallographic structure and observe.
Metallographic observation results shows: adopt this technology to prepare tiny, the rounding of microstructure of semisolid of AZ91D magnesium alloy, grain size is 30～50 μ m.Measuring mechanical property shows that the performance of comparing semisolid AZ91D magnesium alloy with common cast alloy is significantly increased.
Embodiment 3:
The liquidus temperature of the mould steel Cr12 that is adopted is about 1600 ℃; The T of mould steel Cr12
Ss=1400 ℃; The gradient of the following washboard that is adopted is 55 °, go up washboard sliding length 400mm, go up the sliding time 1.2S of washboard.
Overheated Cr12 alloy liquid accurately is controlled at 1690 ± 10 ℃ of scopes; Quantifying feed 3～3.5Kg; After last washboard is preheated to 1570～1615 ± 5 ℃, thermostatic control; To the lower end, temperature is the gradient temperature field from 1650 ℃ to 1390 ℃ from the upper end in following washboard formation.Last washboard is 6Mpa to the pressure of following washboard.The shear time of control slurry is 0.8～1.2S.With slurry the insulation mould in about 1400 ± 5 ℃ be incubated 15～30S, with control alloy pulp fraction solid between 0.4～0.6.After the semi solid slurry of preparation is abundant, by squeeze cylinder semi solid slurry is expressed to that preparation experiment thickness is the plate tensile sample of 2.5mm in the cast iron mould.To previously prepared alloy casting state tissue with adopt the microstructure of semisolid of this technology preparation to carry out metallographic structure and observe.
The result shows, adopts the Cr12 alloy microstructure of semisolid densification of this technology preparation, and the porosity only is 0.25%.Tissue contains a large amount of spherical and corynebacterium crystal grain.Show that shear action has changed the form and the distribution of alloy interior tissue, improved compactness, and played the effect of structure refinement.Measurement result is pointed out the crystal particle scale of alloy between 40～70 μ m, and the crystal grain sphericity is on average greater than 0.8.Above result has proved absolutely the superiority of this semi-solid processing technology.
Claims (3)
1. the preparation method of a composite shearing semi-solid state metal rheological slurry, it is characterized in that: this method comprises the steps:
(1), with the alloy hydraulic control built in liquidus temperature T
LIn the 0-100 ℃ of above scope;
(2), adopt to squeeze rub the unit with the hands, this squeezes to rub with the hands in unit and includes upper and lower washboard, last washboard is short washboard with respect to washboard down, and the washboard for sliding on washboard down, and goes up washboard and by the cylinder control of exerting pressure following washboard is formed pressure; Following washboard is long washboard with respect to last washboard, and for become the fixedly washboard at angle of inclination with horizontal plane, last washboard is 200-1500mm playing the sliding length on the washboard, and the temperature of last washboard is controlled at T
L-40 ℃～T
LIn+20 ℃ of scopes, and will play the temperature of the upper end of washboard to control T
L-50 ℃～T
LIn+50 ℃ of scopes, the temperature of lower end is controlled at T
Ss-20 ℃～T
Ss+ 20 ℃, wherein, T
SsExpression semi-solid processing temperature, T
SsBetween liquidus temperature T
LWith solidus temperature T
sBetween, following washboard be controlled to be 0.03-1 ℃/mm to the thermograde of lower end from its upper end;
(3), with on the washboard under the importing of alloy liquid, and pressing washboard on the alloy liquid, and by last washboard following washboard is formed the pressure of 0～10Mpa by the cylinder of exerting pressure, and above-mentioned pressure is not equal to zero, to go up the washboard ballast again and alloy liquid from the lower end slip of the downward washboard in upper end of washboard down, sliding time is 100～5000ms;
(4), when going up the washboard ballast and alloy liquid and slide into down the lower end of washboard, alloy liquid flow into to be told in the material unit, is incubated in telling material unit, the temperature of insulation is controlled at T
Ss-5 ℃～T
SsIn+5 ℃ of scopes, after the insulation, alloy liquid is solidified as the semi-solid metal slurry that contains spherical or granular primary crystal.
2. the preparation method of composite shearing semi-solid state metal rheological slurry according to claim 1 is characterized in that, this method also comprises the steps:
(5), will flow into the semi solid slurry told in the material unit after insulation, the effect by squeeze cylinder is injected into mold or imports in the continuous cast mold, makes this semi-solid metal slurry that contains spherical or granular primary crystal be frozen into foundry goods or continuous casting material.
3. the preparation method of composite shearing semi-solid state metal rheological slurry according to claim 1 is characterized in that, described washboard down becomes the angle of inclination with horizontal plane be 0～75 °, and above-mentioned angle of inclination is not equal to zero.
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| CN105970126B (en) * | 2016-07-20 | 2018-04-27 | 西安理工大学 | A kind of method that Under Pressure Solidification prepares fine grain CuNiMnFe alloys |
| CN109706413A (en) * | 2019-03-07 | 2019-05-03 | 哈尔滨工业大学 | A kind of preparation method of semi-solid billet of GH3536 nickel-based superalloy |
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