CN110358956A - A kind of preparation method of high-performance magnesium-alloy casting - Google Patents
A kind of preparation method of high-performance magnesium-alloy casting Download PDFInfo
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- CN110358956A CN110358956A CN201810320020.5A CN201810320020A CN110358956A CN 110358956 A CN110358956 A CN 110358956A CN 201810320020 A CN201810320020 A CN 201810320020A CN 110358956 A CN110358956 A CN 110358956A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
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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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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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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Abstract
The invention discloses a kind of preparation methods of high-performance magnesium-alloy casting, belong to cast magnesium alloy technical field of heat treatment.Casting made of magnesium alloy preferred chemical component is carried out hip treatment first by this method under high temperature, condition of high voltage, then carries out solid solution and ageing treatment under normal pressure.The present invention makes the loose elimination in Mg alloy castings；After hot isostatic pressing and solution treatment, coarse eutectic phase is completely dissolved, and solute element is uniformly distributed in matrix, even tissue, after ageing treatment, has good ageing strengthening effect；Compared with Mg alloy castings conventional preparation techniques, the present invention can not only significantly improve the mechanical property of the Mg alloy castings of preferred chemical component, can also promote performance uniformity, stability and the yield rate of casting.
Description
Technical field
The present invention relates to cast magnesium alloy technical field of heat treatment, and in particular to a kind of preparation of high-performance magnesium-alloy casting
Method.
Background technique
Compared with the structural materials such as other metals, plastics and timber, magnesium alloy has specific strength, specific stiffness height, damping
Good, electromagnetic shielding and capability of resistance to radiation are strong, Cutting free processing, the easily series of advantages, the referred to as green work of 21 century such as recycling
Journey material.
However the loose tendency of existing business magnesium alloy cast is significantly higher than aluminium alloy and other metal materials, rarefaction defect
The mechanical property of alloy material or casting can be significantly reduced, the large-scale application of magnesium alloy is seriously hindered.Research finds that magnesium closes
Golden casting cannot give full play to the mechanical property of its alloy material inherently, and the performance or difference of same casting different parts
The not high reason of the homogeneity and stability of the performance at the same position of casting is because rarefaction defect can reduce heat treatment
Effect.Since loose and divorsed eutectic is mutually formed in solidification latter stage, often occur in grain boundaries association, the eutectic of loose position
Phase surface is hanging, not with substrate contact, the diffusion area of solute atoms when solution treatment is caused substantially to lower and (lower~50%).
Fig. 1 show pattern of the VW63 alloy without the backscattered electron imaging behind puffs and puffs ageing treatment；Therefore, common solid
In molten treatment process, the loose volume that can reduce the material matrix for needing to accommodate diffusion solute atoms due to eutectic phased soln,
The speed for reducing eutectic phased soln makes to be heat-treated required time extension.There are also studies have shown that some alloying elements, such as Y and again
The low an order of magnitude of diffusion coefficient rate ratio Al and Zn of rare earth element (such as Gd, Dy, Er etc.) in magnesium；So passing through
Common solid solution treatment process completely eliminates the eutectic phase in high-strength temperature-resistant magnesium-rare earth casting and needs higher temperature or longer
Time.
For rarefaction defect, on the one hand using casting methods such as advanced low pressure, differential pressures and reasonable founder can be designed
The rarefaction defect in casting is eliminated or reduced to skill by designing the solidifications such as effective Feeding channel, riser and chill control technique.But
Be same casting different parts reach no rarefaction defect state critical feeding pressure it is not fully identical, the feeding at some positions
Pressure needed for the complete feeding of realization may be not achieved in pressure.Moreover, even if in the case where feeding pressure is sufficiently large, due to casting
The complexity of part structure, wall unevenness is even, and the Feeding channel at some positions is caused to have some setbacks.It is illustrated in figure 2 space flight sand mold
Gravitational casting ZM6/WE43 magnesium alloy bracket structural schematic diagram, several gusset wall ratios among bracket are relatively thin, in Filling Processes of Castings
It has just been solidified before finishing, the pressure and fill compression pressure after low pressure casting fills type does not have feeding work to these gussets
With, it is difficult to completely eliminate rarefaction defect therein.On the other hand, repair welding is industrially generallyd use to lack the casting in casting
It is trapped into capable reparation.However the general area of magnesium alloy rarefaction defect is larger, surrounding tissue is not generally also fine and close, and when repair welding inputs
Heat easily cause at repair welding and its surrounding cracks again, rarefaction defect can hardly pass through Welding Repair.Therefore, it needs
Seek the loose approach of new elimination.
Industrially high temperature alloy, titanium are closed using hot isostatic pressing (hot isostatic pressing, abbreviation HIP) technique
Gold etc. carries out eliminating loose densification, which has the good result for improving cast product overall mechanical properties.It is right
In internal not fine and close, the material that hole is in communication with the outside, aluminium alloy, the titanium alloy material of powder metallurgical technique preparation are such as taken,
Outer sheathing process need to be taken, by the not high material packet of consistency within one layer of housing, then it is carried out at hot isostatic pressing again
Reason also has the effect for improving mechanical property well, but for casting, due to the complexity of shape, sheathing process is simultaneously
It is not easy to implement.
Summary of the invention
The problems such as lower, unstable for common heat treatment Mg alloy castings mechanical property, it is an object of the invention to mention
For a kind of preparation method of high-performance magnesium-alloy casting.
To achieve the above object, the technical solution adopted in the present invention is as follows:
Initial Mg alloy castings are put into hot isostatic pressing first by a kind of preparation method of high-performance magnesium-alloy casting, this method
Hip treatment is carried out in furnace, it is air-cooled after coming out of the stove；Casting is successively carried out to solid solution and ageing treatment in atmospheric conditions again, i.e.,
Obtain the high-performance magnesium-alloy casting；On loose rank≤3 grade of the initial Mg alloy castings or initial cast at least
There are loose rank≤3 grade at one in regional area.
Solidification temperature range≤100 DEG C of the initial Mg alloy castings.
Weight percentage, the preferred chemical component of Mg alloy castings are as follows: Y 1.0~15.0%, Nd 0~
5%, heavy rare earth element is 0.5~15.0%, Zn 0~2.0%, Zr 0.1~0.9%, remaining is Mg；Wherein: heavy rare earth member
Total content >=5.5% of element, Y and Nd.The heavy rare earth element is one of Gd, Dy, Er, Tb, Ho, Tm, Yb and Lu or several
Kind.
The holding temperature of the hip treatment is 350~550 DEG C, and dwell pressure is 10~300MPa, soaking time
For 0.1~10h, tapping temperature is lower than 300 DEG C.
The temperature of the solution treatment is 450~550 DEG C, and the time is 1~72h, and the type of cooling after solution treatment is water
It is cold, oily cold or air-cooled.
The temperature of the ageing treatment is 100~300 DEG C, and the time is 1~200h, and the type of cooling after ageing treatment is water
It is cold, oily cold or air-cooled.
The initial Mg alloy castings are after the method for the present invention is handled, and loose elimination in casting obtains high performance magnesium
Alloy-steel casting.
Design Mechanism of the present invention is as follows:
The present invention first to whole region or at least one, cast by the initial magnesium alloy of loose rank≤3 grade of regional area
Part carries out hot isostatic pressing densification.The initial Mg alloy castings can be chosen according to calculation of thermodynamics phasor and thermal analysis experiment
The magnesium alloy ingredient of solidification temperature range≤100 DEG C manufactures, weight percentage, preferred casting chemical component are as follows: Y
1.0~15.0%, Nd 0~5.0%, one of heavy rare earth element (such as Gd) or several summations are 0.5~15.0%, Zn
0~2.0%, Zr 0.1~0.9%, remaining is Mg, in which: heavy rare earth element+Y+Nd >=5.5%；Under high-temperature and high-pressure conditions
Carry out hip treatment, due to material body creep and so that rarefaction defect is made up and is eliminated, cast-internal is loose scarce
Metallurgical bonding is obtained between sunken surface, the second phase for keeping loose place hanging comes into full contact with matrix, in hip treatment mistake
Eutectic phase preliminarily solubilised in journey, solute atoms are tentatively spread.Then, it is easier to obtain ingredient by solution treatment and uniformly satiate
And solid solution, it is finally reached good ageing strengthening effect.Method of the invention is taken, the Mg alloy castings of preparation have more preferable
Mechanical property, and stable mechanical property is more preferable.
The present invention has the advantage that
1, the present invention provides a kind of preparation method of high-performance magnesium-alloy casting, simple process is cast to magnesium alloy is improved
The effect of part mechanical property is good.Rarefaction defect during process implementing in Mg alloy castings is occurred by material matrix creep
It makes up, forms metallurgical bonding, so that second phase at loose place is easier diffusion dissolution during solution treatment, reach good heat
Treatment effect.It is significantly improved using the room temperature intensity and plasticity of Mg alloy castings prepared by the present invention, while performance
Stabilizability is also significantly improved.
2, the present invention applies to casting each to equivalent power under the high temperature conditions, and cast(ing) surface uniform force, casting is not sent out
Raw apparent macroscopic deformation.
Detailed description of the invention
Fig. 1 is VW63 alloy without the back scattering pattern behind puffs and puffs ageing treatment；Wherein: (a) without puffs；
(b) puffs.
Fig. 2 is space flight sand mold gravitational casting ZM6/WE43 magnesium alloy bracket structural schematic diagram.
Fig. 3 is the loose grading egative film of the big plane of ZM6 bracket (area Tu2Zhong a).
Fig. 4 is the loose grading egative film of VW63 magnesium alloy.
Fig. 5 is sand mold gravitational casting VW63 magnesium alloy cabin 3-D view.
Fig. 6 is sand mold gravitational casting VW63/VW103 magnesium alloy test plate (panel) 3-D view.
Specific embodiment
The present invention is described in further detail with embodiment with reference to the accompanying drawing.
The present invention attempts heat and other static pressuring processes being applied to magnesium alloy and casting, to improve its mechanical property.It has carried out just
Experimental study is walked, Fig. 3 is that the loose of radioscopy egative film of the big plane of space flight sand mold gravitational casting ZM6 bracket in Fig. 2 is commented
Grade (dissection is from the position a of Fig. 2), most of loose grading in region are all larger than three-level.The study found that carrying out hot isostatic pressing to it
After processing, although the coefficient of variation of mechanical property reduces, (value is the ratio between standard deviation and average value, for measuring the phase of numerical value
To consistency and stability), but tensile strength and elongation percentage do not improve.It can consider hot isostatic pressing according to existing experimental result
Processing is to the not effective technique of ZM6 casting.Similarly, the units such as Anshun of Guizhou Anji hot investment casting Co., Ltd pass through to ZM6
Similar conclusion is also obtained with similar test of Mg alloy castings progress such as ZM5.
Research finds that the solidification temperature range of magnesium alloy is generally wider.Such as: the solidification temperature range of ZM5 magnesium alloy about exists
168 DEG C or so (428 DEG C~596 DEG C), and the solidification temperature range of ZM6 magnesium alloy is about at 110 DEG C or so (535 DEG C~645 DEG C).
It is generally acknowledged that the loose tendency of the wide alloy of solidification temperature range is high, and containing inside high-level loose Mg alloy castings and extraneous
It is connected, for intricate casting, sheathing process is not easy to implement, therefore loose improve cannot be eliminated by heat and other static pressuring processes
Its mechanical property.
Research shows that alloying elements and magnesium form the alloy with higher eutectic temperature, make magnesium alloy solidification humidity province
Between become narrower, such as Sr, Si, Sn element.The addition of Sr influences less the solidus of AZ91 alloy, but can be substantially reduced conjunction
The liquidus curve of gold；After adding 0.8%Sr (wt.%) in AZ91 alloy, liquidus curve drops to 566 DEG C from 596 DEG C, has dropped 30
℃.From 168 DEG C of AZ91 alloy 131 DEG C dropped to after adding 0.8%Sr, solidification temperature range reduces solidification temperature range
About 20%.In ZA84 magnesium alloy, solidification temperature range from 227.7 DEG C drops to 195.7 DEG C afterwards for addition 1.6%Si (wt.%).
Alloying element Sn can effectively reduce the solidification temperature range of magnesium alloy, and wherein Mg-Sn bianry alloy solidification temperature range is less than
90 DEG C, it is much smaller than Mg-Al, Mg-Zn bianry alloy.
In addition to this, rare earth element is also formed with magnesium with higher total such as Y and heavy rare earth element (such as Gd, Er, Dy etc.)
The alloy of brilliant temperature effectively reduces the solidification temperature range of magnesium alloy.Such as Mg-10Gd-3Y-0.5Zr (wt.%, VW103) magnesium
Alloy, solidification temperature range is about at 91 DEG C or so (544 DEG C~635 DEG C)；Mg-6Gd-3Y-0.5Zr (wt.%, VW63) magnesium closes
The solidification temperature range of gold is about at 99 DEG C or so (544 DEG C~643 DEG C).Fig. 4 is the loose grading of VW63 magnesium alloy radioscopy
Egative film, loose grading are normally no higher than 3 grades, thus it is speculated that the alloy with relatively narrow solidification temperature range has lower dredge
Pine tendency, the consistency of casting is relatively high, it is possible to be eliminated under conditions of jacket is not added by heat and other static pressuring processes loose
Defect obtains high mechanical property, guarantees the mechanical property consistency and stability of different casting or casting different parts.
According to the above analysis, if reducing the solidification temperature range of magnesium alloy, it is possible to obtain by design of alloy
The Mg alloy castings of low loose rank.Consolidate again after carrying out heat and other static pressuring processes processing to the Mg alloy castings of low loose rank
Molten, ageing treatment will obtain high performance Mg alloy castings.
On the other hand, during hip treatment, due to need to make it is loose make up, occur atom diffusion realize it is loose
The metallurgical bonding on surface, therefore the treatment temperature of hot isostatic pressing cannot be too low.As temperature reduces, the diffusion coefficient of solute atoms
It can exponentially rule be remarkably decreased, if temperature is from when being reduced to 450 DEG C for 540 DEG C, diffusion coefficient of the Y element in magnesium matrix is reduced
About an order of magnitude.In addition, the creep rate of material can be reduced by reducing treatment temperature, significantly extend through material creep and
Make loose to make the required time up.In order to guarantee that production efficiency, temperature generally should not be below 350 DEG C.On the other hand, processing temperature
Degree should not the too high and processing time it is unsuitable too long.It is handled higher than 550 DEG C, the crystallite dimension of material can quickly be roughened, and reduce mechanics
Performance.350 DEG C -550 DEG C are set by the treatment temperature of the hot isostatic pressing of preferred magnesium alloy thus, the control of processing time is existed
0.1~10h.For preferred magnesium alloy, the crystal boundary in 450~550 DEG C and 1~72h is arranged in the temperature and time of solution treatment
Second phase is completely dissolved into matrix, and apparent Phenomena of Grain Growth does not occur, has good solid solution effect.
For Mg-Gd system magnesium alloy, Precipitation sequence is SSSS (cph) → β " (DO19)→β′(cbco)→β
(Mg5Gd, fcc), for Mg-Nd system magnesium alloy, Precipitation sequence is SSSS (cph) → G.P.zones → β " (D019)→β′
(fcc)→β(Mg12Nd, bct), β " and (or) β ' they are mutually considered as that magnesium-rare earth alloy obtains good room temperature and time high temperature (< 250
DEG C) mechanics and the reason of croop property.Aging temp is 100~300 DEG C, and the time is 1~200h, and temperature is too low, hardening constituent β ",
β ' can not be precipitated, and overaging easily occurs for excessively high aging temp.
By above-mentioned a large number of experiments and bond material Analysis on Theoretical Basis, the present invention provides a kind of castings of high-performance magnesium-alloy
The preparation method of part.Firstly, optimizing magnesium alloy chemical ingredient according to solidification temperature range, selecting solidification temperature range≤100
DEG C magnesium alloy, guarantee loose rank≤3 grade in all or part of region in Mg alloy castings.Secondly, to preferred chemical component
Manufactured Mg alloy castings carry out the hip treatment of certain time and temperature, make loose cavity gradually up, at the same time,
The eutectic phase at loose place comes into full contact with matrix, accelerates the preliminary diffusion of solute atoms.Then, then by solid solution treatment process make
Eutectic phased soln in matrix, is uniformly distributed in solute atoms in matrix, the uniform supersaturated solid solution of forming component, finally
The uniform, disperse educt by hardening constituent in aging technique promotion matrix again.To obtain high performance Mg alloy castings, and have
Good metallurgical quality and stability.
Embodiment 1
The practical chemical component of the VW63 Mg alloy castings selected in the present embodiment is (wt.%): heavy rare earth element is selected
Gd, in an amount of from 5.87%, Y:2.65%, Zr:0.47%, surplus is magnesium；The Mg alloy castings use resin bonded sand mould gravitational casting
Technique preparation, Casting Three-dimensional view is as shown in figure 5, outer profile size is Φ 746*462mm；The solidification temperature range of the alloy is about
It is 99 DEG C, the loose rank of resin bonded sand mould casting is 0-3 grades.
It is as follows to the treatment process of the Mg alloy castings:
(1) hip treatment is carried out to VW63 resin bonded sand mould casting, holding temperature is 480 DEG C, and pressure maintaining pressure is
100MPa, soaking time 3h, then, 300 DEG C or less are come out of the stove for heat preservation, and air is cooling.
(2) by after hip treatment VW63 resin bonded sand mould casting carry out solution treatment, heat up with furnace, solid solubility temperature and
Soaking time is respectively 500 DEG C and 8h, and heat preservation is then, powered-down to come out of the stove, and air is cooling.
(3) the VW63 resin bonded sand mould casting after solution treatment is subjected to ageing treatment, heated up with furnace, aging temp and heat preservation
Time is respectively 200 DEG C and 80h, and heat preservation is then, powered-down to come out of the stove, and air is cooling.
It is Fig. 5 frame favored area that the present embodiment mechanical property sample, which cuts position, by hip treatment and then solid solution
3 grades and 3 grades loose eliminations below in aging heat treatment VW63 resin bonded sand mould casting, tensile mechanical properties at room temperature
It is shown in Table 1.Compared with the VW63 resin bonded sand mould casting that normative heat treatment technique (without hip treatment) obtains, using this method
The average fracture elongation of the casting of preparation at room temperature is improved by 1.25% to 5.33%, improves 327%, variation lines
Number is reduced to 0.11 by 0.85；And average tensile strength is improved by 269MPa to 335MPa, ascensional range 25%, the coefficient of variation
0.01 is reduced to by 0.33.
Change the Gd in the present embodiment into other heavy rare earth elements such as Dy or Er, under same treatment conditions, gained is high
Loose elimination in casting, mechanical property under room temperature are essentially identical in performance magnesium alloy.
Embodiment 2
The practical chemical component of the initial VW63 Mg alloy castings selected in the present embodiment is (wt.%): heavy rare earth element
Gd is selected, in an amount of from 6.84%, Y:3.39%, Zr:0.42%, surplus is magnesium；Tree is used again after carrying out purified treatment to melt
The preparation of rouge sand mold gravity foundry technology, Casting Three-dimensional view are as shown in Figure 6；The solidification temperature range of the alloy is about 99 DEG C, sand
The loose rank of type casting is 0-3 grades.
It is as follows to the treatment process of the initial Mg alloy castings:
(1) hip treatment is carried out to VW63 resin bonded sand mould casting, holding temperature is 480 DEG C, and pressure maintaining pressure is
100MPa, soaking time 3h, then, 300 DEG C or less are come out of the stove for heat preservation, and air is cooling.
(2) by after hip treatment VW63 resin bonded sand mould casting carry out solution treatment, heat up with furnace, solid solubility temperature and
Soaking time is respectively 500 DEG C and 8h, and heat preservation is then, powered-down to come out of the stove, and air is cooling.
(3) the VW63 resin bonded sand mould casting after solution treatment is subjected to ageing treatment, heated up with furnace, aging temp and heat preservation
Time is respectively 200 DEG C and 80h, and heat preservation is then, powered-down to come out of the stove, and air is cooling.
The present embodiment mechanical property sample position is Fig. 6 frame favored area.By hip treatment and subsequent solid solution aging
3 grades and 3 grades loose eliminations below in the VW63 resin bonded sand mould casting of heat treatment, tensile mechanical properties at room temperature are shown in Table
1.Compared with the VW63 resin bonded sand mould casting that normative heat treatment technique (without hip treatment) obtains, prepared using this method
Casting average fracture elongation at room temperature improved by 1.00% to 2.33%, improve 133%, the coefficient of variation by
0.5 is reduced to 0.45；And average tensile strength is improved by 310MPa to 338MPa, ascensional range 9%, the coefficient of variation is by 0.05
It is reduced to 0.04.
Embodiment 3
The initial Mg alloy castings selected in the present embodiment are Mg-10Gd-3Y-0.5Zr, and composition by weight percent is attached most importance to dilute
Earth elements select Gd, and in an amount of from 9.91%, Y:2.57%, Zr:0.38%, content of magnesium is balance, is abbreviated as VW103；It is right
Melt is prepared using resin bonded sand mould gravity foundry technology again after carrying out purified treatment, and Casting Three-dimensional view is as shown in Figure 6；The alloy
Solidification temperature range be about 91 DEG C, the loose rank of sand-cast be 0-3 grades.
It is as follows to the treatment process of the initial Mg alloy castings:
(1) hip treatment is carried out to VW103 resin bonded sand mould casting, holding temperature is 480 DEG C, and pressure maintaining pressure is
100MPa, soaking time 3h, then, 300 DEG C or less are come out of the stove for heat preservation, and air is cooling.
(2) the VW103 resin bonded sand mould casting after hip treatment is subjected to solution treatment, arrives Wen Jinlu, solid solubility temperature
It is respectively 525 DEG C and 12h with soaking time, heat preservation is then, powered-down to come out of the stove, and air is cooling.
(3) the VW103 resin bonded sand mould casting after solution treatment is subjected to ageing treatment, arrives Wen Jinlu, aging temp and guarantor
The warm time is respectively 250 DEG C and 12h, and heat preservation is then, powered-down to come out of the stove, and air is cooling.
The present embodiment Mechanics Performance Testing sample position such as Fig. 6 frame favored area, by hip treatment and then solid solution
3 grades and 3 grades loose eliminations below in aging heat treatment VW103 resin bonded sand mould casting, stretching mechanical at room temperature
1 can be shown in Table.Compared with the VW103 Mg alloy castings that normative heat treatment technique (without hip treatment) obtains, using we
The average fracture elongation of the VW103 sand-cast of method preparation at room temperature is improved by 2.90% to 4.13%, is improved
43%；And average tensile strength is improved by 300MPa to 309MPa, ascensional range 3%, the coefficient of variation is reduced to by 0.04
0.01。
Embodiment 4
The chemical component for the initial Mg alloy castings that the present embodiment uses is by weight percentage for Y:4.20%, Nd:
2.66%, heavy rare earth element selects Gd, and in an amount of from 1.09%, Zn:0.21%, Zr:0.50%, content of magnesium is balance, letter
It is written as WE43；It is prepared using resin bonded sand mould gravity foundry technology, casting structure schematic diagram is as shown in Figure 2；The setting temperature of the alloy
Section is about 80 DEG C, and the loose rank of sand-cast is 0-3 grades.
It is as follows to the treatment process of the initial Mg alloy castings:
(1) hip treatment is carried out to WE43 resin bonded sand mould casting first, holding temperature is 480 DEG C, and pressure maintaining pressure is
100MPa, soaking time 3h, then, 300 DEG C or less are come out of the stove for heat preservation, and air is cooling.
(2) by after hip treatment WE43 resin bonded sand mould casting carry out solution treatment, arrive Wen Jinlu, solid solubility temperature and
Soaking time is respectively 525 DEG C and 8h, and heat preservation is then, powered-down to come out of the stove, 80 DEG C of hot water quenchings.
(3) the WE43 resin bonded sand mould casting after solution treatment is subjected to ageing treatment, arrives Wen Jinlu, aging temp and heat preservation
Time is respectively 250 DEG C and 8h, and heat preservation is then, powered-down to come out of the stove, and air is cooling.
The region the present embodiment Mechanics Performance Testing sample position such as Fig. 2 big plane a, it is by hip treatment and then solid
3 grades and 3 grades loose eliminations below in molten aging heat treatment WE43 resin bonded sand mould casting, stretching mechanical at room temperature
1 can be shown in Table.Compared with the WE43 resin bonded sand mould casting that normative heat treatment technique (without hip treatment) obtains, using we
The average fracture elongation of the casting of method preparation at room temperature is improved by 2.83% to 10.17%, is improved 259%, is become
Different coefficient is reduced to 0.23 by 0.51；And average tensile strength is improved by 231MPa to 261MPa, ascensional range 13%, variation
Coefficient is reduced to 0.03 by 0.04.
Comparative example 1
The chemical component for the initial Mg alloy castings that this comparative example uses is by weight percentage for Nd:2.10%, Zn:
0.30%, Zr:0.54%, Fe: < 0.005%, Si: < 0.005%, content of magnesium is balance, is abbreviated as ZM6；Using resin
The preparation of sand mold gravity foundry technology, casting structure schematic diagram are as shown in Figure 2；The solidification temperature range of the alloy is about 110 DEG C, sand mold
The loose rank of casting is 4-8 grades.
It is as follows to the treatment process of the initial Mg alloy castings:
(1) hip treatment is carried out to ZM6 resin bonded sand mould casting first, holding temperature is 480 DEG C, and pressure maintaining pressure is
100MPa, soaking time 3h, then, 300 DEG C or less are come out of the stove for heat preservation, and air is cooling.
(2) the ZM6 resin bonded sand mould casting after hip treatment is subjected to solution treatment, heated up with furnace, furnace temperature is from room temperature
Rise to 225 DEG C, time-consuming 120min, 225 DEG C heat preservation 30min, linear temperature increase to 325 DEG C, time-consuming 60min, 325 DEG C heat preservation 30min,
To 425 DEG C, time-consuming 60min, 425 DEG C heat preservation 30min, linear temperature increase is kept the temperature to 527 DEG C, time-consuming 60min, 527 DEG C linear temperature increase
720-960min, heat preservation is then, powered-down to come out of the stove, and air is cooling.
(3) the ZM6 resin bonded sand mould casting after solution treatment is subjected to ageing treatment, heated up with furnace, aging temp and heat preservation
Time is respectively 200 DEG C and 12h, and heat preservation is then, powered-down to come out of the stove, and air is cooling.
This comparative example mechanical property sample position is the region Fig. 2 big plane a, when being dissolved by hip treatment and then
It imitates the tensile mechanical properties of the ZM6 resin bonded sand mould casting of heat treatment at room temperature and is shown in Table 1.With normative heat treatment technique (without heat
Isostatic pressing) the resin bonded sand mould casting of ZM6 magnesium alloy that obtains compares, using the room temperature mechanical property of the casting of this method preparation
There can not be not substantive raising.
The tensile mechanical properties of 1 embodiment and comparative example Mg alloy castings of table at room temperature
Annotation: the coefficient of variation is the ratio between standard deviation and average value
Above-described embodiment only refers to, and has and of the invention similar or from the technique side that this patent thinking extends
Method, in protection scope of the present invention.
Claims (6)
1. a kind of preparation method of high-performance magnesium-alloy casting, it is characterised in that: this method first puts initial Mg alloy castings
Enter and carries out hip treatment in hot isostatic pressing furnace, it is air-cooled after coming out of the stove；Again by casting in atmospheric conditions successively carry out solid solution and
Ageing treatment obtains the high-performance magnesium-alloy casting；The loose grade in the initial Mg alloy castings all or part region
Not≤3 grade.
2. the preparation method of high-performance magnesium-alloy casting described in accordance with the claim 1, it is characterised in that: percentage composition by weight
Meter, the chemical component of the Mg alloy castings are as follows: Y 1.0~15.0%, Nd 0~5.0%, heavy rare earth element be 0.5~
15.0%, Zn 0~2.0%, Zr 0.1~0.9%, remaining is Mg；Wherein: the total content of heavy rare earth element, Y and Nd >=
5.5%.
3. the preparation method of high-performance magnesium-alloy casting described in accordance with the claim 1, it is characterised in that: at the hot isostatic pressing
The holding temperature of reason is 350~550 DEG C, and dwell pressure is 10~300MPa, and soaking time is 0.1~10h, and tapping temperature is lower than
300℃。
4. the preparation method of high-performance magnesium-alloy casting described in accordance with the claim 1, it is characterised in that: the solution treatment
Temperature is 450~550 DEG C, and the time is 1~72h, and the type of cooling after solution treatment is water cooling, oil is cold or air-cooled.
5. the preparation method of high-performance magnesium-alloy casting described in accordance with the claim 1, it is characterised in that: the ageing treatment
Temperature is 100~300 DEG C, and the time is 1~200h, and the type of cooling after ageing treatment is water cooling, oil is cold or air-cooled.
6. the preparation method of high-performance magnesium-alloy casting described in accordance with the claim 1, it is characterised in that: the Mg alloy castings
After processing, the loose elimination in casting, obtains high performance Mg alloy castings.
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Application publication date: 20191022 |