CN106756681A - A kind of semi-solid blank fast preparation method based on texture controlling thought - Google Patents
A kind of semi-solid blank fast preparation method based on texture controlling thought Download PDFInfo
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- CN106756681A CN106756681A CN201611180654.2A CN201611180654A CN106756681A CN 106756681 A CN106756681 A CN 106756681A CN 201611180654 A CN201611180654 A CN 201611180654A CN 106756681 A CN106756681 A CN 106756681A
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- C—CHEMISTRY; METALLURGY
- 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
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- 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
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
Abstract
The invention discloses a kind of quick method for preparing semi-solid die casting blank, belong to semi-solid blank preparing technical field.This preparation method is comprised the following steps：The AZ91 magnesium alloy bars prepared using semicontinuous cast method are heated to 215 DEG C, 15 minutes are incubated so that temperature is uniform, it is put into the ECAP steel moulds for being similarly 215 DEG C, the passage interior angle knuckle radius of mould is controlled within the 1/15 of AZ91 bar diameters, after one passage of extruding, blank is taken out from mould and is placed in the resistance furnace that temperature is 560 DEG C, held for some time, water-cooled obtains semi-solid blank to room temperature；Or using ECAP extruding Bc paths multiple passage, C paths are no more than 2 passages, and Ba paths are no more than 4 passages, then carry out semisolid remelting, prepare semi-solid die casting blank.The present invention on the basis of existing technology, is controlled in terms of mould structure and ECAP deformations so that is quickly prepared the Semi-Solid Thixoforming blank that crystal grain is tiny, sphericity is high and is possibly realized.
Description
Technical field
The invention belongs to magnesium alloy semi-solid state blank preparing technical field；It is related to a kind of the fast of semi-solid die casting blank
Fast preparation method, on the basis of existing technology, from the meso-scale of magnesium alloy --- from the point of view of texture, can solve the problem that existing
There is technology in semi-solid blank preparation process, the grain mergin of generation is grown up, the problem of sphericity difference, it is ensured that using as far as possible small
Plastic deformation dependent variable in advance, prepare the semi-solid die casting blank of excellent performance.
Background technology
Existing Semi-Solid Thixoforming blank preparation method, is all to use first to carry out initial blank big plastic deformation, then
After the semi-solid temperature of blank interval insulation a period of time, the method for obtaining semi-solid die casting blank.The method thinks, greatly
The tissue that plastic deformation is obtained is more tiny, then more be conducive to preparing semi-solid blank, therefore in preparation process, in advance big
Plastic deformation amount is the bigger the better.The present invention casts aside above-mentioned theory and thought, from the angle of texture, it is indicated that big plastic deformation is thin
While changing crystal grain, certain types of texture is formed, the texture can be during semisolid remelting, the side for promoting crystal grain to merge
Formula is grown up, so as to influence the crystallite dimension and sphericity parameter of semi-solid blank.
The content of the invention
The invention solves the problems that, it is necessary to amount of plastic deformation is larger in advance in existing semi-solid die casting blank preparation process,
And during semisolid remelting, the grain mergin of generation is grown up not high so as to reduce semi-solid blank sphericity, and crystal grain is bigger than normal
Problem, there is provided a brand-new visual angle, i.e., the machine of growing up of crystal grain during semisolid remelting is controlled from the angle of texture
Reason, prepares the semi-solid blank that sphericity is high, crystal grain is tiny.
It is a primary object of the present invention to prepare the semi-solid die casting blank that sphericity is high, crystal grain is tiny.
Another object of the present invention is to reduce the work being plastically deformed in advance in semi-solid die casting blank preparation process
Measure so that quickly prepare semi-solid blank and be possibly realized.
It is a further object of the present invention to provide application of the above-mentioned semi-solid blank in engineer applied field.
A kind of semi-solid blank fast preparation method based on texture controlling thought, including step in detail below：
The AZ91 magnesium alloy bars that semicontinuous cast is produced are heated to uniform temperature, and are incubated a period of time, be placed on same
It is heated in the steel ECAP moulds of higher temperature, according to certain extruding rate, after extruding different passages according to different paths,
Sample is taken out, is placed in heat-treatment furnace, carry out semisolid remelting process, be subsequently cooled to room temperature, obtain semi-solid blank.
Preferably, the AZ91 magnesium alloys bar, is heated to uniform temperature interval, and corresponding ECAP moulds are also carried out adding
Heat, ECAP extruding is carried out according to certain extruding rate, can be a passage, it is also possible to multiple passages, controls the class of texture
Type and component.Extruding is finished, and sample is taken out, and is placed on temperature in 550 DEG C -580 DEG C of heat-treatment furnace, and soaking time exists
Between 10min-30min, water-cooled, or liquid nitrogen cooling are used after insulation, obtain semi-solid blank.
The magnesium alloy bar is heated to uniform temperature, preferably 180 DEG C -230 DEG C of intervals.
Described magnesium alloy bar insulation a period of time, preferably 10-15min.
The ECAP moulds are heated, and its temperature range is 180 DEG C of -230 DEG C of intervals, preferably with AZ91 magnesium alloy bars
Identical temperature.
The ECAP extruding rates, are 0.001s-1-0.1s-1。
The ECAP extrudes one or more passage, is the multiple passages of Bc paths extruding, is 1-12 passage, according to life
Actual demand is produced to determine；C paths are no more than 2 passages, are to be extruded using C paths, and extruding passage is 1 or 2 passage；Ba paths
It is to be extruded using Ba paths no more than 4 passages, it is 1,2,3 or 4 passage to be pressed into place.Only 1 road can also be extruded
It is secondary, preferably extrude 1 passage.
The ECAP moulds, are steel mould, 1/15 of its interior angle knuckle radius no more than extruded bar stock diameter.
The heat-treatment furnace, can be resistance furnace, or electromagnetic oven, during semisolid remelting is carried out, at heat
Reason stove in be vacuum state, or filling inert gas protected.
The Reheating Temperature of Semi-Solid Metal, is 550 DEG C of -580 DEG C of temperature ranges.
The semisolid remelting soaking time, is 5-30min.
The semisolid remelting is cooled to room temperature, is to use water-cooled, or liquid nitrogen cooling, it is not possible to use air cooling or stove
It is cold.
Mechanism of the invention is：
By the extruding rate for controlling ECAP so that AZ91 magnesium alloys are extruded at alap temperature so that plasticity
The effect of grain refinement and grain deformation farthest embodies；Path and passage, control AZ91 magnesium alloy lifes are extruded by controlling ECAP
Into texture and component, it is to avoid during semisolid remelting occur crystal grain coalescence, so as to allow Ostwald cure mechanism
Leading role is occupied, the semi-solid blank that sphericity is high, crystal grain is tiny is prepared.
Compared with prior art, the beneficial effects of the invention are as follows：
（1）The present invention is removed crudely and store essence, and extruding path and the extruding passage of control ECAP are proposed from the angle of texture, is eliminated existing
It is prone to the technology that grain mergin is grown up in Semi-Solid Thixoforming blank technology of preparing so that during semisolid remelting
Ostwald curings mechanism occupies leading role, can prepare that sphericity is high, the tiny semi-solid blank of crystal grain；
（2）The present invention proposes the Controlling principle of ECAP mould interior angle knuckle radius to the further optimization of prior art, and using compared with
Small extruding rate, reduces the extrudable temperature of AZ91 magnesium alloys as far as possible, greatly improves the grain refining effect of ECAP, reduces
Repeat the possibility of multi-pass extruding so that ECAP single pass extruding prepares semi-solid blank and is possibly realized, promote ECAP to exist
Practical application in engineering technology.
Brief description of the drawings
Fig. 1 is the Semi-Solid Thixoforming blank microstructure of quick preparation of the present invention；
Fig. 2 is the texture formed after semicontinuous cast AZ91 magnesium alloys extrude 1 passage through ECAP；
Fig. 3 is that as a comparison, semicontinuous cast AZ91 magnesium alloys experience ECAP path A extrude the texture formed after 4 passages；
Fig. 4 is semicontinuous cast AZ91 magnesium alloys extrudes 1 passage through ECAP, and it is microcosmic that 570 DEG C of 15 minutes semisolid remeltings are formed
Tissue（Embodiment 1）；
Fig. 5 is that as a comparison, semicontinuous cast AZ91 magnesium alloys experience ECAP path A extrude 4 passages, 570 DEG C of semisolid weights
The microstructure that molten different time is formed（Comparative example）；
Fig. 6 is that metallograph is analyzed using computer software, and the crystallite dimension and form factor of the embodiment 1 of acquisition are solid with half
The evolution of state remelting soaking time；
Fig. 7 is that metallograph is analyzed using computer software, and the crystallite dimension and form factor in the comparative example of acquisition are with half
The evolution of solid-state remelting soaking time.
Specific embodiment
The present invention is described in further detail with reference to embodiment and accompanying drawing, but embodiments of the present invention are not limited to
This.
Embodiment 1：It is prepared by large scale semi-solid blank
Original material：Semicontinuous cast AZ91 magnesium alloy bars
Size：Φ60x150mm
Angular radius in mould：r=3mm
Preparation method comprises the following steps：
（1）ECAP is extruded：AZ91 magnesium alloy bars are heated to 210 DEG C, 15min are incubated, equally by ECAP moulds（Two passages are pressed from both sides
90 ° of angle）210 DEG C are heated to, then bar is put into the entrance of mould.In bar and die entrance contact surface, MoS2 is sprayed
Lubricant, starts forcing press, with the slow extruded bar stock of the extrusion speed of 1.5mm/s, until can be from the outlet of mould by bar
Take out；
（2）Semisolid remelting：The bar taken out from ECAP is put into resistance furnace, is vacuumized, be put into argon gas and serve as protectiveness gas
Atmosphere, anti-oxidation keeps resistance furnace 570 DEG C 15 minutes, then takes out blank, is quickly put into cooling in liquid nitrogen, obtains half solid
State blank.
Embodiment 2：It is prepared by reduced size semi-solid blank
Original material：As-extruded AZ91 magnesium alloy bars
Size：Φ20x45mm
Angular radius in mould：r=1mm
Preparation method comprises the following steps：
（3）ECAP is extruded：AZ91 magnesium alloy bars are heated to 210 DEG C, 10min are incubated, equally by ECAP moulds（Two passages are pressed from both sides
90 ° of angle）180 DEG C are heated to, then bar is put into the entrance of mould.In bar and die entrance contact surface, graphite spraying
Lubricant, starts forcing press, with the slow extruded bar stock of the extrusion speed of 0.5mm/s, until can be from the outlet of mould by bar
Take out.Then bar is placed again into ECAP entrances, according to continuously extruded 4 passages in Bc paths, and is taken out from outlet；
（4）Semisolid remelting：The AZ91 magnesium alloy bars of ECAP extruding will be completed, be put into resistance furnace, vacuumized, be put into argon gas
Serve as protective atmosphere, anti-oxidation keeps resistance furnace 560 DEG C 10 minutes, then takes out blank, be quickly put into cold in cold water
But, semi-solid blank is obtained.
Embodiment 3：It is prepared by reduced size semi-solid blank
Original material：Semicontinuous cast AZ91 magnesium alloy bars
Size：Φ10x45mm
Angular radius in mould：r=0.5mm
Preparation method comprises the following steps：
（5）ECAP is extruded：AZ91 magnesium alloy bars are heated to 200 DEG C, 8min are incubated, equally by ECAP moulds（Two passages are pressed from both sides
90 ° of angle）190 DEG C are heated to, then bar is put into the entrance of mould.In bar and die entrance contact surface, graphite spraying
Lubricant, starts forcing press, with the slow extruded bar stock of the extrusion speed of 0.5mm/s, until can be from the outlet of mould by bar
Take out.Then bar is placed again into ECAP entrances, the 2nd passage is extruded according to C paths, taken out from mould outlet；
（6）Semisolid remelting：The AZ91 magnesium alloy bars of ECAP extruding will be completed, be put into resistance furnace, vacuumized, be put into nitrogen
Serve as protective atmosphere, anti-oxidation keeps resistance furnace 550 DEG C 10 minutes, then takes out blank, be quickly put into cold in cold water
But, semi-solid blank is obtained.
Embodiment 3：Test in semi-solid blank preparation process
（1）Textile analysis
Blank after experience ECAP extruding, materialses from blank middle part, and its texture is carried out using method of X-ray diffraction
Analysis, selectes { 0002 } and { 10-10 }, { 10-11 } and { 10-12 } pole figure of test structure cell.Fig. 2 is acquisition in embodiment 1
Texture pole, understands through analysis, forms three kinds of preferable grain orientations that component compares larger, respectively { 14-59 }<25-
76>, { 14-57 }<14-56>{ 12-36 }<71-8-6>, but in fact they basal plane orientation be all very close to, can recognize
To be to be approximately 45 ° of angles with the direction of extrusion, but crystal orientation orientation differs greatly, and does not form obvious crystal orientation preferred orientation.
As a comparison, identical process, but Fig. 3 is showed in using the AZ91 magnesium alloy pole figures that ECAP extrudes 4, paths of A passage
In, the texture of formation is { 0001 }<-1-120>, i.e. basal plane { 0001 } is parallel with the direction of extrusion, crystal orientation<-1-120>Parallel to crowded
Pressure direction.Both form visibly different texture；
（2）Semisolid microstructure
By the sample of semisolid remelting process, sanding and polishing, the nital with 4% corrodes, in Zeiss optical microphotographs
Microscopic observation microstructure, Fig. 4 be embodiment 1 in AZ91 bars in resistance furnace, 570 DEG C 10 minutes obtain microstructures,
Crystal grain is relatively uniform, tiny, and sphericity is high；
As a comparison, Fig. 5 illustrates semi-solid blank after A paths extrude 4 passages and prepares metallograph, and Fig. 6 a are 570 DEG C of guarantors
Hold the microstructure of 5 minutes, Fig. 6 b are the microstructure of 20 minutes, it can be seen that during semisolid remelting, there occurs compared with
It is obvious crystal boundary selective melting, and increases over time, the crystal boundary of the fusing that is not able to do in time also have selected with the conjunction of crystal grain
And mode is grown up, the drastically change of crystallite dimension and sphericity is caused.
（3）Interpretation of result
The metallograph for obtaining is analyzed with specialized image software I mage-Pro plus.Each sample at least takes two allusion quotations
The image of type is measured, and is then averaged.The Average equivalent diameter of crystal grain can be calculated with following formula：
D=[∑2/(Ai/π)1/2]/N
And the grain shape factor in image can be then calculated by following formula：
F= [∑Pi 2/(4πAi)]/N
In formulaN--- the sum of crystal grain in image；
A--- the area of single crystal grain in image；
P--- the girth of single crystal grain in image.
In embodiment 1, the equivalent diameter and form factor of crystal grain are as shown in Figure 6, it can be seen that with the increase of time, brilliant
Particle size slowly increases, and form factor is increasingly intended to 1, i.e. sphericity more and more higher.Contrast A paths extrude 4 passages
AZ91 magnesium alloy blanks, as shown in fig. 7, form factor had one significantly to increase in insulation 5-10 minutes or so, it is then just slow
It is slow to be intended to 1 again, but terminate within 20 minutes until being incubated, its form factor is both greater than embodiment 1.
Above-described embodiment is the present invention preferably implementation method, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from Spirit Essence of the invention and the change, modification, replacement made under principle, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (8)
1. a kind of semi-solid blank fast preparation method based on texture controlling thought, it is characterised in that including walking in detail below
Suddenly：The AZ91 magnesium alloy bars that semicontinuous cast is produced are heated to uniform temperature, and are incubated a period of time, be placed on same adding
Heat, according to certain extruding rate, after extruding different passages according to different paths, takes in the steel ECAP moulds of higher temperature
Go out sample, be placed in heat-treatment furnace, carry out semisolid remelting process, be subsequently cooled to room temperature, obtain semi-solid blank.
2. according to claim 1, AZ91 magnesium alloy bars are heated to uniform temperature interval, corresponding ECAP moulds
Heated, ECAP extruding is carried out according to certain extruding rate, can be a passage, it is also possible to which multiple passages, control is knitted
The type and component of structure；
Extruding is finished, and sample is taken out, and is placed on temperature in 550 DEG C -580 DEG C of heat-treatment furnace, and soaking time is in 10min-
Between 30min, water-cooled, or liquid nitrogen cooling are used after insulation, obtain semi-solid blank.
3. according to claim 1, magnesium alloy bar is heated to uniform temperature, preferably 180 DEG C -230 DEG C of intervals；Magnesium alloy
Bar insulation a period of time, preferably 10-15min；ECAP moulds are heated, and its temperature range is 180 DEG C of -230 DEG C of intervals, excellent
Choosing and AZ91 magnesium alloy bar identical temperature.
4. according to claim 1, ECAP extrudes one or more passage, is the multiple passages of Bc paths extruding, is 1-
12 passages, determine according to produce reality demand；C paths are no more than 2 passages, are to be extruded using C paths, and extruding passage is 1
Or 2 passages；Ba paths are no more than 4 passages, are to be extruded using Ba paths, and it is 1,2,3 or 4 passage to be pressed into place；
Only 1 passage can also be extruded, 1 passage is preferably extruded.
5. according to claim 1, ECAP moulds are steel mould, and its interior angle knuckle radius is straight no more than extruded bar stock
The 1/15 of footpath；ECAP extruding rates, are 0.001s-1-0.1s-1。
6. according to claim 1, heat-treatment furnace can be resistance furnace, or electromagnetic oven, carry out semisolid weight
It is vacuum state during molten, in heat-treatment furnace, or filling inert gas etc. is protected.
7. according to claim 1, Reheating Temperature of Semi-Solid Metal is 550 DEG C of -580 DEG C of temperature ranges；Semisolid remelting is incubated
Time, is 5-30min.
8. according to claim 1, semisolid remelting is cooled to room temperature, is to use water-cooled, or liquid nitrogen cooling.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108080430A (en) * | 2017-12-06 | 2018-05-29 | 宿迁市河海大学研究院 | A kind of processing method of Ultra-fine Grained high-strength magnesium alloy thin plate |
| CN109202031A (en) * | 2018-10-25 | 2019-01-15 | 成都先进金属材料产业技术研究院有限公司 | The preparation method of the automobile-used alloy semi-solid blank of predeformation |
| CN112024629A (en) * | 2019-12-18 | 2020-12-04 | 哈尔滨理工大学 | Method for preparing semi-solid blank by pulse current |
| CN113355617A (en) * | 2021-06-03 | 2021-09-07 | 兰州理工大学 | Preparation method of magnesium alloy with bimodal structure |
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| JP2004322206A (en) * | 2003-04-21 | 2004-11-18 | Hyundai Motor Co Ltd | Method for manufacturing magnesium alloy billet for semi-solidified forming |
| CN101730755A (en) * | 2007-02-27 | 2010-06-09 | 密执安州立大学董事会 | Production is used to form the equipment and the method for the fine grained metal sheet of net-shape components |
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| JP2004322206A (en) * | 2003-04-21 | 2004-11-18 | Hyundai Motor Co Ltd | Method for manufacturing magnesium alloy billet for semi-solidified forming |
| CN101730755A (en) * | 2007-02-27 | 2010-06-09 | 密执安州立大学董事会 | Production is used to form the equipment and the method for the fine grained metal sheet of net-shape components |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108080430A (en) * | 2017-12-06 | 2018-05-29 | 宿迁市河海大学研究院 | A kind of processing method of Ultra-fine Grained high-strength magnesium alloy thin plate |
| CN109202031A (en) * | 2018-10-25 | 2019-01-15 | 成都先进金属材料产业技术研究院有限公司 | The preparation method of the automobile-used alloy semi-solid blank of predeformation |
| CN112024629A (en) * | 2019-12-18 | 2020-12-04 | 哈尔滨理工大学 | Method for preparing semi-solid blank by pulse current |
| CN113355617A (en) * | 2021-06-03 | 2021-09-07 | 兰州理工大学 | Preparation method of magnesium alloy with bimodal structure |
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