CN108543919A - A kind of high-performance Mg-Zn-Zr alloy short flow processes - Google Patents
A kind of high-performance Mg-Zn-Zr alloy short flow processes Download PDFInfo
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- CN108543919A CN108543919A CN201810516092.7A CN201810516092A CN108543919A CN 108543919 A CN108543919 A CN 108543919A CN 201810516092 A CN201810516092 A CN 201810516092A CN 108543919 A CN108543919 A CN 108543919A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/002—Castings of light metals
- B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
- B22D7/064—Cooling the ingot moulds
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Abstract
A kind of high-performance Mg Zn Zr alloy short flow processes, the casting mould of casting including alloy and hot-working, the alloy is rectangular water cooled copper mould, and mold compact dimensions are 150mm*150mm*150mm, mold cooling water capacity is 300 ± 10ml, and cooling water flow velocity is 3 ± 0.5 liters/min；The hot processing temperature of alloy is 300 ± 5 DEG C, the hot-working preincubation time is 10 ± 1 minutes, thermal processing method is that small passage strains the forging of high strain rate three-dimensional, forging equipment is pneumatic hammer, not Repeat-heating between passage, passage dependent variable is 20 ± 0.5%, and rolling pass is 12 passages, and the type of cooling is air-cooled.The present invention prepares the cast sturcture of uniform isometric and approximate solid solution by water cooled copper mould, while making up temperature caused by heat dissipation using the temperature-rise effect of high-speed deformation and declining, and need not be heated between passage, the process-cycle is short, is suitable for the production of block Mg Zn Zr alloys.
Description
Technical field
The present invention relates to a kind of Mg-Zn-Zr alloy preparation methods, and in particular to a kind of short stream of high-performance Mg-Zn-Zr alloys
Journey preparation method.
Background technology
Magnesium alloy is most light structural metallic materials, has high specific strength, high specific stiffness, good damping capacity, excellent
Thermal conductivity and electric conductivity, good dimensional stability, electromagnetic wave shielding and the characteristics such as be easily recycled.In recent years, with the energy
With becoming increasingly conspicuous for environmental problem, magnesium alloy emerges rapidly as new engineering material, is increasingly becoming aluminium alloy, steel and engineering
The ideal substitute of the engineering material such as plastics has weight in fields such as aerospace, communications and transportation, weaponry and electronic apparatus
The application value and wide application prospect wanted.
But the lag of low strength and the high-strength magnesium alloy exploitation of magnesium alloy seriously constrains the extensive of magnesium alloy and answers
With therefore, the research and development of high-strength magnesium alloy meets the important development direction of industrial requirement as it.In recent years, big plasticity
Deformation is concerned as one of high-performance magnesium-alloy processing method, but this method workpieces processing size is small, and is usually required first
It carries out Homogenization Treatments and carries out hot-working again, life cycle of the product is longer, and industrialized mass production feasibility is relatively low.
Invention content
The technical problem to be solved by the invention is to provide a kind of high-performance Mg-Zn-Zr alloy short flow processes,
This method is simple for process, high in machining efficiency, the excellent product performance of preparation, is suitable for industrialized mass production.
The technical solution adopted by the present invention to solve the technical problems is：A kind of high-performance Mg-Zn-Zr alloy short route systems
Preparation Method includes the casting and hot-working of alloy, and the casting mould of the alloy is rectangular water cooled copper mould, and mold compact dimensions are
150mm*150mm*150mm, mold cooling water capacity are 300 ± 10ml, and cooling water flow velocity is 3 ± 0.5 liters/min；The conjunction
The hot processing temperature of gold is 300 ± 5 DEG C, and the hot-working preincubation time is 10 ± 1 minutes, and thermal processing method is that the strain of small passage is high
Strain rate three-dimensional is forged, and forging equipment is pneumatic hammer, and Repeat-heating, passage dependent variable are not 20 ± 0.5% between passage, deformation
Passage is 12 passages, and the type of cooling is air-cooled.
Further, the rectangular water cooled copper mould cooling water capacity is 300 ± 5ml, more preferable 300ml.
Further, the rectangular water cooled copper mould cooling water flow velocity is 3 ± 0.2 liters/min, more preferable 3 liters/min.
Further, the state before the alloy hot-working is as cast condition block materials.
Further, the hot processing temperature of the alloy is 300 ± 2 DEG C, more preferable 300 DEG C.
Further, the hot-working preincubation time is 10 ± 0.5 minutes, more preferable 10 minutes.
Further, passage dependent variable is 20 ± 0.2%, more preferable 10%.
The beneficial effects of the present invention are：
(1) casting mould of alloy is rectangular water cooled copper mould, and mold compact dimensions are 150mm*150mm*150mm, mold
Cooling water capacity is 300 ± 10ml, and cooling water flow velocity is 3 ± 0.5 liters/min, and ingot casting can obtain uniform equiax crystal at this time
Tissue, and alloying element has little time to be precipitated during being quickly cooled down, and obtains single phase solid solution substantially, is not necessarily to before hot-working
It is heat-treated.
(2) hot processing temperature of alloy is 300 ± 5 DEG C, and the processing preincubation time is 10 ± 1 minutes, is become at this temperature
Shape can start basal slip, Prismatic slip and conical surface sliding simultaneously, while ensure material in the case where crystal grain does not occur and grows up
Expect that core is consistent with surface temperature, ensures being smoothed out for post forming.
(3) thermal processing method is that small passage strains the forging of high strain rate three-dimensional, and forging equipment is pneumatic hammer, between passage not
Repeat-heating, passage dependent variable are 20 ± 0.5%；Under the action of three directional loads circulation change, dynamic recrystallization and twin is rotated
The raw dynamic recrystallization induced respectively becomes the recrystallization mechanism of initial crystal boundary and intra-die, obtains a kind of novel bimodal crystalline substance
Grain tissue, ensures the good comprehensive mechanical property of product；Using 10 ± 0.5% small passage dependent variable, it is ensured that closed after forging
Gold will not form strong basal plane texture, be conducive to the post forming for improving alloy, ensure yield rate；In addition, using pneumatic hammer
It is forged, the temperature-rise effect of high-speed deformation can also be utilized to make up temperature caused by heat dissipation and declined, heater between passage is saved
Skill shortens the process-cycle, is suitable for the industrialized production of high-performance Mg-Zn-Zr alloys.
Description of the drawings
Fig. 1 is the microstructure morphology of 1 casting alloy of embodiment；
Fig. 2 is the microstructure morphology of 2 casting alloy of embodiment；
Fig. 3 is that small passage strains high strain rate three-dimensional forging technology schematic diagram；
Fig. 4 is the high power microstructure morphology of bimodal grain structure alloy prepared by embodiment 1；
Fig. 5 is the low power microstructure morphology of bimodal grain structure alloy prepared by embodiment 1；
Fig. 6 is the high power microstructure morphology of bimodal grain structure alloy prepared by embodiment 2；
Fig. 7 is the low power microstructure morphology of bimodal grain structure alloy prepared by embodiment 2；
Fig. 8 is that the room temperature before and after Mg-Zn-Zr alloy embodiments draws high curve.
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and embodiments.
Embodiment 1
Mg-2Zn-0.45Zr alloys selected by the present embodiment, sample length, width and height are respectively 70mm, 70mm, 80mm before hot-working.
A kind of high-performance Mg-Zn-Zr alloy short flow processes, include the following steps：
1) casting technique：Mg-2Zn-0.45Zr alloy melts are prepared according to magnesium alloy smelting method, melt are poured into rectangular
Water cooled copper mould, copper mold compact dimensions are 150mm*150mm*150mm, and mold cooling water capacity is 300ml, and cooling water flow velocity is 3
Liter/min, casting process prevents from burning by spreading Cosan, takes out ingot casting after cooling；
2) hot-working heating process：Sample is placed in heating furnace before forming and carries out heating and thermal insulation, heating temperature is set
It is set to 300 DEG C, soaking time is 10 minutes, so that sample is heated evenly, ensures material cores in the case where crystal grain does not occur and grows up
Portion is consistent with surface temperature；
3) small passage strain high strain rate three-dimensional forging：Heat processing and forming carries out on pneumatic hammer, and pneumatic hammer forges
Number is 200 times/min, and rapidity of blow 5m/s is shaped using primary heating, i.e., forges work without heating, three-dimensional between passage
Skill is as shown in figure 3, forge face by A-B-C-A ..., and sequence carries out, and often forges a face and is counted as a time, pass deformation 20%,
Sample is carried out after the completion of hot-working air-cooled to retain high temperature deformation tissue.
Sample surfaces are good after hot-working, without apparent crackle, are lost without apparent macroscopic view.
Embodiment 2
Embodiment 2 and embodiment 1 difference lies in：Processing object is different, and processing object alloying component is Mg-6Zn-
0.45Zr。
Specimen material surface is good after hot-working, without apparent crackle, is lost without apparent macroscopic view.
The embodiment 1-2 microstructures obtained and mechanical property are analyzed with reference to experimental data.
1. microstructure characterizes：It chooses casting alloy and deforming alloy core in embodiment 1-2 and prepares microstructure observation
Sample, by inlaying sample, pre-grinding, polishing, corrosion, using the sample after the micro- sem observation corrosion of MM6 type horizontal metallurgicals, cast sturcture is such as
Shown in Fig. 1 and Fig. 2, Deformation structure is as shown in Figure 4-Figure 7.
It can be seen that in embodiment 1 and embodiment 2 from Fig. 1 and Fig. 2, under the action of water cooled copper mould, alloy graining group
It is woven to more uniform equiaxed grain structure, and the second phase not coarse near crystal boundary, obtains single phase solid solution body tissue substantially.
From fig. 4, it can be seen that in embodiment 1, alloy is finally organized as a kind of novel bimodal grain structure；In low power
It is carried out under light microscope it has been observed that being respectively formed the bimodal grain structure of rule distribution in entire sample interior, not
Local feature, as shown in Figure 5.
As can be seen from Figures 6 and 7, the bimodal crystalline substance of the rule distribution almost the same with embodiment 1 is obtained in example 2
Grain tissue.
2. Mechanics Performance Testing：According to the standard of national standard GB228-2002, alloy described in the embodiment of the present invention is processed into
Standard tensile specimen carries out tensile tests at room, and measured room temperature draws high curve such as Fig. 8 and shows that mechanical property is shown in Table 1.
The mechanical property of 1 embodiment processed sample of table
| Embodiment | Yield strength (MPa) | Tensile strength (MPa) | Elongation percentage (%) |
| 1 as cast condition of embodiment | 126.2 | 211.9 | 6.5 |
| After embodiment 1 | 203.4 | 331.6 | 25.1 |
| 2 as cast condition of embodiment | 134.3 | 240.3 | 8.1 |
| After embodiment 2 | 198.1 | 330.2 | 25.7 |
From Fig. 8 and table 1 as can be seen that yield strength, the tension that can greatly improve Mg-Zn-Zr alloys with the present invention are strong
The Mg-Zn-Zr alloy block materials of degree and elongation percentage, preparation have good comprehensive mechanical property.
High-performance Mg-Zn-Zr alloy short flow processes of the present invention, are quickly cooled down by water cooled copper mould, are obtained
Uniformly isometric and approximate solid solution cast sturcture, without heat treatment before ingot casting hot-working；Using under high speed three directional loads, close
The difference of golden initial crystal boundary and transgranular recrystallization mechanism, prepares the controllable novel bimodal tissue of crystal grain distribution, ensures that product is good
Comprehensive mechanical property；Using small passage dependent variable, ensure alloy post forming ability；In addition, the present invention utilizes high-speed deformation
Temperature-rise effect make up temperature caused by heat dissipation and decline, between passage need not heating, the process-cycle is short, is suitable for high-performance Mg-Zn-Zr
The industrialized production of alloy block material.
Finally it is pointed out that above example is only intended to illustrate rather than limitation, in fact, of the invention
Method other alloys are equally applicable；When those skilled in the art do simple replacement to product under the teachings of the present invention,
Still fall within protection scope of the present invention.
Claims (10)
1. a kind of high-performance Mg-Zn-Zr alloy short flow processes, it is characterised in that：Casting including alloy and hot-working,
The casting mould of the alloy is rectangular water cooled copper mould, and mold compact dimensions are 150mm*150mm*150mm, and mold cooling water holds
Amount is 300 ± 10ml, and cooling water flow velocity is 3 ± 0.5 liters/min；The hot processing temperature of the alloy is 300 ± 5 DEG C, hot-working
The preincubation time is 10 ± 1 minutes, and thermal processing method is that small passage strains the forging of high strain rate three-dimensional, and forging equipment is air
It hammers into shape, Repeat-heating, passage dependent variable are not 20 ± 0.5% between passage, and rolling pass is 12 passages, and the type of cooling is air-cooled.
2. high-performance Mg-Zn-Zr alloy short flow processes according to claim 1, it is characterised in that：It is described rectangular
Water cooled copper mould cooling water capacity is 300 ± 5ml.
3. high-performance Mg-Zn-Zr alloy short flow processes according to claim 2, it is characterised in that：It is described rectangular
Water cooled copper mould cooling water capacity is 300ml.
4. high-performance Mg-Zn-Zr alloy short flow processes according to claim 1 or 2 or 3, it is characterised in that：Institute
It is 3 ± 0.2 liters/min to state rectangular water cooled copper mould cooling water flow velocity.
5. high-performance Mg-Zn-Zr alloy short flow processes according to claim 4, it is characterised in that：It is described rectangular
Water cooled copper mould is 3 liters/min.
6. high-performance Mg-Zn-Zr alloy short flow processes according to claim 1 or 2 or 3, it is characterised in that：Institute
It is as cast condition block materials to state the state before alloy hot-working.
7. high-performance Mg-Zn-Zr alloy short flow processes according to claim 1 or 2 or 3, it is characterised in that：Institute
The hot processing temperature for stating alloy is 300 ± 2 DEG C.
8. high-performance Mg-Zn-Zr alloy short flow processes according to claim 1 or 2 or 3, it is characterised in that：Heat
It is 10 ± 0.5 minutes to process the preincubation time.
9. high-performance Mg-Zn-Zr alloy short flow processes according to claim 1 or 2 or 3, it is characterised in that：Road
Secondary dependent variable is 20 ± 0.2%.
10. high-performance Mg-Zn-Zr alloy short flow processes according to claim 9, it is characterised in that：Passage is answered
Variable is 20%.
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Cited By (1)
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| CN114836664A (en) * | 2022-04-23 | 2022-08-02 | 中国兵器装备集团西南技术工程研究所 | High-strength high-plasticity heat-resistant magnesium alloy component and preparation method thereof |
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Application publication date: 20180918 |