CN103725999A - Method for weakening deformed magnesium alloy texture - Google Patents
Method for weakening deformed magnesium alloy texture Download PDFInfo
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- CN103725999A CN103725999A CN201310731493.1A CN201310731493A CN103725999A CN 103725999 A CN103725999 A CN 103725999A CN 201310731493 A CN201310731493 A CN 201310731493A CN 103725999 A CN103725999 A CN 103725999A
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Abstract
The invention provides a method for weakening a deformed magnesium alloy texture. The method comprises the steps of: alloy smelting, homogenizing treatment and large plastic deformation, wherein the addition amount of the major alloy element of the magnesium alloy ranges from 40% to 150% of the maximum solid solubility thereof in the magnesium alloy; the accumulated deformation amount of the large plastic deformation is 1.5-5.0; the rate of deformation is 0.0005 to 0.5s<-1>. The method is applicable to all magnesium alloy system, and simple in process flow, convenient to operate and low in cost; various rods, plates and forgings excellent in properties can be produced by using the existing processing equipment. The method is capable of weakening the texture under the interaction of dynamic recrystallization and the dynamic precipitation phase, weakening or eliminating the anisotropy of the mechanical properties of the deformed magnesium alloy products, and simultaneously, improving the secondary processibility of the alloy and expanding the application range of the deformed magnesium alloy.
Description
Technical field
The invention belongs to metal material processing preparation field, relate to magnesium alloy processing, be specifically related to a kind of method for weakening of wrought magnesium alloys texture.
Background technology
Magnesium alloy, as the lightest structural metallic materials, has the advantages such as specific tenacity and specific rigidity are high, damping shock absorption is good, in fields such as aerospace, defence and military, automobile, electronics, all has important using value and wide market outlook.At present, magnesium-alloy material is to be cast into master mostly, but the mechanical property of foundry goods is not ideal enough, and shape of product size has some limitations and easily produces as tissue defects such as pore, shrinkage cavities, and the range of application of magnesium alloy is very restricted.Magnesium alloy is after the thermal distortions such as forging, extruding, and tissue obtains remarkable refinement, and cast structure's defect is eliminated, and mechanical property is significantly promoted.As the magnesium alloy of close-packed hexagonal structure, ingot casting can form strong anisotropy (deformation texture) after distortion, the existence one of this deformation texture is to make product have obvious Mechanical Property Anisotropy, the 2nd, low-alloyed suitability for secondary processing falls, limited the range of application of wrought magnesium alloys.Therefore,, for obtaining the uniform wrought magnesium alloys member of mechanical property, a kind of method that proposes texture of improving wrought magnesium alloys is very necessary.
In recent years, the technique of existing multiple regulation and control magnesium alloy texture both at home and abroad, as asymmetrical rolling, equal channel angular rolling, tandem rolling and unidirectional alternating bending distortion etc., but these methods only make basal plane texture deflect, and do not make its intensity significantly decline; And, rolling technology more complicated, technical difficulty is higher, is unsuitable for scale operation.
Another method of improving magnesium alloy texture is to add rare earth element in magnesium alloy.In Chinese patent CN101619428A, recorded a kind of method of adding rare earth element and improve wrought magnesium alloys texture, the add-on of rare earth element accounts for pure magnesium or magnesium alloy weight 0.9～14%, and the membership that adds of a large amount of rare earth elements increases alloy density and carries heavy alloyed cost.
Summary of the invention
The object of the present invention is to provide a kind of method for weakening of wrought magnesium alloys texture, thereby weaken or eliminate the Mechanical Property Anisotropy of wrought magnesium alloys product, texture attenuation is mainly to realize by dynamic recrystallization and the interaction of Dynamic Precipitation phase.
The present invention seeks to be achieved through the following technical solutions:
A method for weakening for wrought magnesium alloys texture, is characterized in that: comprise alloy melting, homogenizing processing, large plastometric set step; The main alloying element addition of described magnesium alloy should be its in magnesium alloy maximum solid solution degree 40%～150% between, the cumulative deformation of described large plastometric set is 1.5～5.0.
In order further to eliminate as tissue defects such as pore, shrinkage cavities, increase mechanical property, carries heavy alloyed suitability for secondary processing, the main alloying element addition of described magnesium alloy be preferably its in magnesium alloy maximum solid solution degree 40%～98%.
The method is applicable to all magnesium alloy systems, and technical process is simple, easy to operate, and cost is low, adopts existing processing units just can produce bar, sheet material and the forging of various excellent propertys.
In order further to improve mechanical property of the present invention, the rate of deformation of large plastometric set of the present invention is 0.0005～0.5s
-1.
In order further to increase the use properties of magnesium alloy, in the present invention, above-mentioned large plastometric set temperature used should be lower than 20 ℃～200 ℃ of homogenization temperatures.
Specifically, processing step of the present invention is as follows:
The first step: alloy melting
Pure magnesium, 680 ℃～800 ℃ fusings, is then added to the alloying element of preheating, carry out mechanical stirring simultaneously, pour into a mould after standing.
Second step: homogenizing processing
Obtained ingot casting is carried out to homogenizing processing at 330 ℃～540 ℃, and homogenizing soaking time is 8～24h, and homogenizing is processed rear naturally cooling or quench treatment.
The 3rd step: large plastometric set
To between 310 ℃～500 ℃, carry out large plastometric set through homogenizing ingot casting after treatment, heating 1～5h before distortion, cumulative deformation is 1.5～5.0, rate of deformation is 0.0005～0.5s
-1.
In the present invention, above-mentioned preheating is the conventional preheating method in this area.
In the present invention, the main alloying element addition of above-mentioned magnesium alloy should be its in magnesium alloy maximum solid solution degree 40%～150% between.
In the present invention, above-mentioned homogenizing is lowered the temperature after processing, and according to practical situation, selects naturally cooling or quench treatment.
In the present invention, above-mentioned melting adopts resistance furnace or the heating of intermediate frequency electromagnetic induction furnace.
In the present invention, above-mentioned homogenizing is processed and is adopted chamber type electric resistance furnace heating, and requires pump circulation gas.
In the present invention, above-mentioned large plastometric set temperature used should be lower than 20 ℃～200 ℃ of homogenization temperatures.
In the present invention, above-mentioned large plastometric set technique comprises one or more compound in forging, extruding, rolling etc.
The present invention obtains following beneficial effect:
1. the present invention adopts homogenizing to process and obtains large super saturated solid solution degree, larger solid solubility provides thermodynamic (al) guarantee for being out of shape separating out of precipitated phase, and dislocation in plastic history, the defects such as room provide dynamic (dynamical) guarantee for being out of shape separating out of precipitated phase, the distortion precipitated phase of intercrystalline precipitation can effectively suppress the rotation of dynamic recrystallization crystal grain, thereby weakens texture.The magnesium alloy plate utmost point density maximum value that adopts the present invention to prepare is 2.01, and the sheet material that traditional way is produced exists obvious basal plane texture, and utmost point density maximum value is 8.02.(seeing accompanying drawing 2,3)
2. the magnesium alloy that prepared by the method for the invention has good solid solution and timeliness strengthening effect, and can also make crystal grain obtain refinement, has guaranteed the mechanical property of wrought magnesium alloys.
The present invention than asymmetrical rolling, equal channel angular rolling etc. technique and add the method that rare earth element weakens the texture of wrought magnesium alloys and compare, use range is wider, cost is lower, adopt existing processing units just can produce bar, sheet material and the forging of various weak texture, be suitable for large-scale industrial production.
Accompanying drawing explanation
Fig. 1 is the Microstructure of Magnesium Alloy of surveying in embodiments of the invention 1.
Fig. 2 is the magnesium alloy utmost point figure surveying in embodiments of the invention 1.
Fig. 3 is the magnesium alloy utmost point figure that in comparative example 1, sheet material is surveyed.
Embodiment
Below by embodiment, the present invention is further specifically described.Be necessary to be pointed out that at this following examples are only used to further illustrate the present invention; can not be interpreted as limiting the scope of the invention, person skilled in art can make some nonessential improvement and adjustment to the present invention according to the invention described above content.
Embodiment 1
Processing step:
1. alloy melting: the pure magnesium ingot through preheating is melted in iron crucible, adopt RJ-2 solvent to protect simultaneously, when temperature rise to 750 ℃, add the Mg-Gd of drying, Mg-Y and Mg-Nd master alloy, when temperature rises to 810 ℃, add the Mg-30Zr master alloy of preheating, stir, when temperature is down to 690 ℃～730 ℃, insulation is also after standing 20 minutes, carry out semicontinuous casting, 690 ℃～710 ℃ of teeming temperatures, draw ingot speed 40～60mm/min, semicontinuous ingot casting is of a size of Φ 165mm × 1500mm, alloy nominal composition is: Mg-10Gd-6Y-2Nd-0.5Zr(wt.%).
2. homogenizing processing: ingot casting is put into and is heated to 530 ℃ of chamber type electric resistance furnaces with blower fan and carries out homogenizing processing, and homogenization time is 20h, after homogenizing completes, takes out spindle, after air cooling 6min, puts into the quenching-in water of 80 ℃.
3. large plastometric set: the strand after homogenizing is heated to 500 ℃, carries out the cooling forging and stamping of multiple directions after insulation 2h, be finally swaged into sheet material, cumulative deformation is 2.7, and rate of deformation is 0.03s
-1, the additional attemperator of chopping block, the temperature of upper and lower chopping block is 420 ± 20 ℃, after distortion, recording blank temperature is 415 ℃, shrend immediately after being out of shape.
4. as shown in Figure 1, in microstructure, there are many Dynamic Precipitation phases; Adopt the texture after EBSD technical testing has been out of shape, by Fig. 2, shown, texture distributes and disperses very much, and utmost point density maximum value is 2.01.
Embodiment 2
1. alloy melting: by through pure magnesium ingot melting in resistance furnace of preheating, adopt RJ-5 solvent to protect simultaneously, when temperature rise to 800 ℃, add the Mg-Mn master alloy of drying, when melt temperature drops to 720 ℃, add pure zinc; Be warming up to 780 ℃, skim and stir latter standing 20 minutes, when temperature drops to 730 ℃ of left and right, cast.The nominal composition of gained alloy is: Mg-6.5Zn-0.8Mn(wt.%).
2. homogenizing processing: ingot casting is put into and is heated to 325 ℃ of chamber type electric resistance furnaces with blower fan and carries out homogenizing processing, first step homogenization time is 18h, then with stove, be warming up to 350 ℃ of insulation 2h and carry out second stage homogenizing processing, the air cooling of coming out of the stove after homogenizing completes.
3. large plastometric set: the strand after homogenizing is heated to 370 ℃, after insulation 2h, carry out pier thick, direct round as a ball pulling after pier is thick, after forging, the size of blank and the size of ingot casting are unanimous on the whole, after forging completes, the remaining temperature of utilization is directly pushed blank, now blank temperature is 320 ℃, and die temperature is 320 ℃, extrusion speed 0.01s
-1, cumulative deformation is 5.0.
4. this step is identical with exemplifying embodiment 1.
Embodiment 3
1. alloy melting: by the pure magnesium ingot melting in resistance furnace through preheating; adopt RJ-2 solvent to protect simultaneously; when temperature rise to 730 ℃; add successively aluminium ingot, zinc ingot metal and the Manganese chloride anhydrous of drying, stir melt simultaneously, when temperature rise to 780 ℃; add the Mg-Gd master alloy of preheating; skim and stir latter standing 20 minutes, when temperature drops to 710 ℃ of left and right, cast.The nominal composition of gained alloy is: Mg-8.1Al-1%Gd-0.7Zn-0.1Mn(wt.%).
2. homogenizing processing: ingot casting is put into and is heated to 400 ℃ of chamber type electric resistance furnaces with blower fan and carries out homogenizing processing, and homogenizing soaking time is 16h, the air cooling of coming out of the stove after homogenizing completes.
3. large plastometric set: the strand after homogenizing is heated to 310 ℃, pushes after insulation 2h, mold heated temperature is 300 ℃, extrusion speed 0.0005s
-1, cumulative deformation is 1.5.
4. this step is identical with exemplifying embodiment 1.
Embodiment 4
1. alloy melting: by the pure magnesium ingot melting in resistance furnace through preheating; adopt RJ-2 solvent to protect simultaneously; when temperature rise to 730 ℃; add successively aluminium ingot, zinc ingot metal and the Manganese chloride anhydrous of drying; stir melt simultaneously, when temperature rise to 780 ℃, skim stir after standing 20 minutes; when temperature drops to 710 ℃ of left and right, cast.The nominal composition of gained alloy is: Mg-9.1Al-0.9Zn-0.1Mn(wt.%).
2. homogenizing processing: ingot casting is put into and is heated to 400 ℃ of chamber type electric resistance furnaces with blower fan and carries out homogenizing processing, and homogenizing soaking time is 18h, the air cooling of coming out of the stove after homogenizing completes.
3. large plastometric set: the strand after homogenizing is heated to 380 ℃, carries out after jumping-up pulling after insulation 2h, blank pushes at 330 ℃, extrusion speed 0.001s
-1, cumulative deformation is 3.2.
4. this step is identical with exemplifying embodiment 1.
Comparative example 1
1. this step is identical with exemplifying embodiment 1.
2. this step is identical with exemplifying embodiment 1.
3. large plastometric set: the strand after homogenizing is heated to 510 ℃, carries out the constant temperature forging and stamping of multiple directions after insulation 2h, be finally swaged into sheet material, cumulative deformation is 0.9, and rate of deformation is 1s
-1, shrend immediately after being out of shape.
4. adopt the texture after EBSD technical testing has been out of shape, by showing of Fig. 3, sheet material has obvious basal plane texture, and utmost point density maximum value is 8.02, and texture is stronger.
This also illustrates and adopts method described in the present patent application can significantly weaken the texture of wrought magnesium alloys.
Claims (9)
1. the method for weakening of a wrought magnesium alloys texture, comprise alloy melting, homogenizing processing, large plastometric set step, it is characterized in that: the main alloying element addition of described magnesium alloy should be its in magnesium alloy maximum solid solution degree 40%～150% between, the cumulative deformation of described large plastometric set is 1.5～5.0.
2. the method for claim 1, is characterized in that: the rate of deformation of described large plastometric set is 0.0005～0.5s
-1.
3. method as claimed in claim 1 or 2, is characterized in that: the main alloying element addition of described magnesium alloy be its in magnesium alloy maximum solid solution degree 40%～98%.
4. method as claimed in claim 3, is characterized in that: will between 310 ℃～500 ℃, carry out large plastometric set through homogenizing ingot casting after treatment, and heating 1～5h before distortion, cumulative deformation is 1.5～5.0, rate of deformation is 0.0005～0.5s
-1.
5. method as claimed in claim 4, is characterized in that: described large plastometric set temperature should be lower than 20 ℃～200 ℃ of homogenization temperatures.
6. the method as described in claim 1 or 4, is characterized in that: described large plastometric set step comprises one or more compound in forging, extruding, rolling etc.
7. the method for claim 1, is characterized in that: carries out in accordance with the following steps,
The first step: alloy melting
Pure magnesium, 680 ℃～800 ℃ fusings, is then added to the alloying element of preheating, carry out mechanical stirring simultaneously, pour into a mould after standing;
Second step: homogenizing processing
Obtained ingot casting is carried out to homogenizing processing at 330 ℃～540 ℃, and homogenizing soaking time is 8～24h, and homogenizing is processed rear naturally cooling or quench treatment;
The 3rd step: large plastometric set
To between 310 ℃～500 ℃, carry out large plastometric set through homogenizing ingot casting after treatment, heating 1～5h before distortion, cumulative deformation is 1.5～5.0, rate of deformation is 0.0005～0.5s
-1.
8. method as claimed in claim 7, is characterized in that: described homogenizing is processed and adopted the chamber type electric resistance furnace heating that requires pump circulation gas.
9. method as claimed in claim 7, is characterized in that: the mode of described large plastometric set is after strand heating, to carry out jumping-up pulling to form blank, afterwards blank is pushed.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105032964A (en) * | 2015-09-19 | 2015-11-11 | 太原理工大学 | Continuous extrusion machining device used for magnesium alloy sheet strip with weak basal texture and extrusion machining method |
| CN106637010A (en) * | 2017-01-12 | 2017-05-10 | 西南大学 | Method for changing orientation of precipitated phase in magnesium alloy |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250631A (en) * | 2008-04-11 | 2008-08-27 | 昆明理工大学 | Process for Improving Plastic Deformability of Magnesium Alloys by Texture Weakening |
| CN101619428A (en) * | 2009-07-31 | 2010-01-06 | 中南大学 | Method for weakening or eliminating deformed magnesium alloy texture |
| CN103255329A (en) * | 2013-05-07 | 2013-08-21 | 宝山钢铁股份有限公司 | Low-cost fine-grain weak-texture magnesium alloy sheet and manufacturing method thereof |
-
2013
- 2013-12-26 CN CN201310731493.1A patent/CN103725999A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250631A (en) * | 2008-04-11 | 2008-08-27 | 昆明理工大学 | Process for Improving Plastic Deformability of Magnesium Alloys by Texture Weakening |
| CN101619428A (en) * | 2009-07-31 | 2010-01-06 | 中南大学 | Method for weakening or eliminating deformed magnesium alloy texture |
| CN103255329A (en) * | 2013-05-07 | 2013-08-21 | 宝山钢铁股份有限公司 | Low-cost fine-grain weak-texture magnesium alloy sheet and manufacturing method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105032964A (en) * | 2015-09-19 | 2015-11-11 | 太原理工大学 | Continuous extrusion machining device used for magnesium alloy sheet strip with weak basal texture and extrusion machining method |
| CN105032964B (en) * | 2015-09-19 | 2016-11-23 | 太原理工大学 | Continuously extruded processing unit (plant) and extruding method for weak basal plane texture magnesium alloy sheet band |
| CN106637010A (en) * | 2017-01-12 | 2017-05-10 | 西南大学 | Method for changing orientation of precipitated phase in magnesium alloy |
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Application publication date: 20140416 |