CN104060138A - Low-cost high-performance non-rare-earth magnesium alloy panel and preparation method thereof - Google Patents
Low-cost high-performance non-rare-earth magnesium alloy panel and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a low-cost high-performance non-rare-earth magnesium alloy panel and a preparation method thereof. The panel comprises the following chemical components by weight percent: 0.1-0.6% of Al, 0.1-0.8% of Ca, 0.1-0.4% of Mn, 0.01-0.3% of Si, and the balance of Mg and inevitable impurities. According to the invention, a series of problems that the existing panel uses the rare earth and high-cost alloy which are used in the existing magnesium alloy panel, and when the magnesium alloy panel is prepared, the existing rolling method is small in passroller amount and available in multiple rollers, the panel needs to be heated repeatedly in midway, so that the magnesium alloy panel has overhigh cost, a complicated technology, thick or uneven local tissues, and obvious anisotropy of room temperature tensile property are solved. The magnesium alloy panel has the characteristics of low cost, high performance, no rare earth and low mechanical anisotropy.
Description
Technical field
The present invention relates to nonferrous materials deformation processing technical field, particularly non-rare earth-magnesium alloy board of a kind of low-cost and high-performance and preparation method thereof.
Background technology
Magnesium alloy is the commercial metal engineering structured material of lightweight, there is the title of " green structured material of 21 century ", have specific tenacity and, damping vibration-absorbing and reducing noise superior performance higher than Young's modulus, casting formability good, be easy to the advantages such as recycling, be with a wide range of applications.In recent years, magnesium alloy causes more and more widely and pays close attention to as lightweight structural material.
Because magnesium has close-packed hexagonal structure, when middle low temperature, basal slip accounts for leading, and the sliding systems such as cylinder, the conical surface are due to critical point of high more difficult the starting of shear-stress, so with respect to cubic structure metal aluminum, the workability of the magnesium alloy of hexagonal structure is poor.Its slip cording has lower symmetry, has caused Mechanical Property Anisotropy also much remarkable than isometric system alloy, has increased the complicacy of magnesium alloy in design, the use procedure of engineering structure.Face the problem that magnesium alloy mechanical property anisotropy is brought, investigator is devoted to study how to regulate and control existing alloy its Mechanical Property Anisotropy in deformation processing process on the one hand both at home and abroad, makes great efforts on the other hand to research and develop novel low-cost, the high-performance magnesium-alloy with less anisotropy.
Chinese patent CN201210426859.X discloses a kind of low-anisotropy magnesium alloy material and preparation method thereof.But the surrender of this magnesium alloy and tensile strength lower (yield strength is lower than 175MPa, and tensile strength is lower than 270MPa), can not meet the demand of most engineering components to mechanical property.And, because this alloy contains Li element, cause its resistance of oxidation poor, under room temperature environment, corrosion comparatively fast, more cannot be applied to comparatively high temps environment.
Research shows, adds suitable rare earth element etc., also can improve to a certain extent plasticity, the intensity of magnesium alloy, optimizes its Anisotropy performance.For example, Chinese patent CN200910011111.1 has announced the hot rolling process of a kind of high-ductility, low-anisotropy magnesium alloy and sheet material thereof, this alloy has reduced the basal plane texture intensity of rolled plate by adding rare earth Gd, obtained weak Mechanical Property Anisotropy and higher unit elongation.But, the intensity lower (yield strength is lower than 150MPa, and tensile strength is lower than 240MPa) of this series alloy, and cause its cost higher owing to adding rare earth element (0.1～10%).And contain in the alloy of higher rare earth content and high price element, not only because the use of rare earth and high valence elements has further increased the cost of material, the existence of some thick intermetallic compounds simultaneously has also increased the deformation processing difficulty of material, and its comprehensive action effect is unsatisfactory.
Existing magnesium alloy adopts traditional warm-rolling rolling method, general single pass draught≤15%, and sheet material reaches target to be depressed in dimension process, and the rolling pass needing is many, needs to reheat between passage; And be very easy to occur that rolling crack, local organization are thick/inhomogeneous, room temperature tensile performance exists the problems such as obvious anisotropy, complex process, high cost; Along with the growth of application market to magnesium alloy plate demand, be badly in need of the low-cost and high-performance magnesium alloy plate tiny, even grained tissue that has of development of new.
Summary of the invention
The object of the present invention is to provide non-rare earth-magnesium alloy board of a kind of low-cost and high-performance and preparation method thereof, solve above-mentioned existing magnesium alloy plate and use rare earth element and high price alloying element, when existing rolling method is prepared magnesium alloy plate, one-pass roller amount is little, passage is many, need repeatedly to heat midway, causes the series of problems such as magnesium alloy plate exists high cost, complex process, local organization is thick/inhomogeneous, room temperature tensile performance anisotropy is obvious; Magnesium alloy plate of the present invention has low cost, high-performance, non-rare earth and has the features such as lower Anisotropy.
For achieving the above object, technical scheme of the present invention is:
The non-rare earth-magnesium alloy board of a kind of low-cost and high-performance, its chemical component weight per-cent is: Al0.1～0.6%, Ca0.1～0.8%, Mn0.1～0.4%, Si0.01～0.3%, all the other are Mg and inevitable impurity.
According to practical experience and theoretical analysis, if wish to increase impact, the raising rolling efficiency of rolling reduction, minimizing rolling temperature alloy rolling performance in the operation of rolling, require to avoid containing more thick second phase particles in alloy structure, although or there is a certain amount of second-phase, homogenizing heat treatment stages that can be before distortion substantially solid solution enters in matrix.In this programme, design alloy element total addition level should be controlled at lower level, before distortion, most second-phases can enter in alloy substrate in solid solution, remaining second-phase size tiny and in matrix disperse distribute; To reduce the possibility that causes stress concentration, alloy cracking in the operation of rolling due to large second-phase fragmentation, meet the object that alloy adopts larger single pass heavy deformation, improves deformation efficiency in rolling deformation process.
Research shows, the principle of design of polynary high-strength magnesium alloy is: one of the atomic radius of main alloy element is larger than magnesium atom, one less than magnesium atom, between this main alloy element, the negative value of enthalpy of mixing more may form more greatly stable interatomic bond simultaneously, be conducive in deformation process, as some aluminium alloy, form the Regulation G .P district of monatomic or polyatom floor, nano level precipitate and stable precipitated phase, thereby ensure that this alloy has high intensity.
The lower alloy element of price conventional in magnesium alloy mainly comprises Al, Zn, Mn, Ca, Si etc.According to above-mentioned theory, by alloy element conventional in magnesium is calculated, find to there is good matching relationship between magnesium, aluminium, calcium, manganese, element silicon.In Mg-Al-Ca-Mn-Si quinary alloy, the atomic radius of Ca atom is greater than Mg atom, and the atomic radius of Si, Al and Mn atom is less than Mg atom, and the negative value of the interatomic enthalpy of mixing such as while Ca-Al and Al-Mn is larger.
Features according to each element in magnesium, can further limit kind and the addition of alloy element needing from the viewpoint of material subject alloy strengthening mechanism, relend and help the phasor of magnesium alloy and verify according to the performance characteristic of actual casting alloy.
Al is the most frequently used alloying element of magnesium alloy.Aluminium can form limit solid solution with magnesium, in improving alloy strength and hardness, can improve castability, also can produce ageing strengthening by thermal treatment.According to document, the heat conductivility of magnalium is along with solid solution atomic quantity increases and reduces.Ca element can produce Grain Refinement Effect in magnesium, also can suppress the oxidation of molten magnesium, improves the kindling temperature of alloy melt, and can improve the creep property of alloy.Obtain by thermodynamics computed in software Mg-Al-Ca ternary phase diagrams: while changing the ratio of Al/Ca, in alloy, may occur three kinds of different second-phases, its second-phase quantity is along with the increase of element addition can increase gradually.Particularly, can obtain orderly individual layer GP district in this alloy, the strengthening effect of this nanostructure alloy is very obvious.Therefore, in order to control amount and the type of the second-phase existing in alloy, adopt low alloying, the content of Al, the Ca of design alloy is all no more than 1%.Al of the present invention, Ca content scope of design are respectively: Al0.1～0.8wt%, Ca0.1～0.6wt%.
Mn controls iron level with precipitation Fe-Mn compound, improves corrosion behavior by controlling iron level; Meanwhile, Mn element can increase thermotolerance in magnesium, crystal grain thinning, reinforced alloys.Add at Mg-6Al-3Ca alloy after the Mn element of 0.1-0.5%, its creep resistance significantly increases, and thermotolerance improves.But the content of Mn in magnesium is generally no more than 1.0wt%.The content that the present invention designs Mn is 0.1～0.4wt%.
Not solid solution of Si, in magnesium, can form compound Mg 2Si (fusing point is 1085 DEG C), is effective strengthening phase.Si can also with alloy in the element such as other alloy element Al, Zn, Ag form stable silicide, improve the creep property of alloy; Also be a kind of weak grain-refining agent.But harmful to corrosive nature.The addition of Si generally can not be too many.The content that the present invention designs Si is 0.01～0.3%.
Each element function of integrated design, Mg-Al-Ca-Mn-Si is associated gold and has multiple possible second-phase, as Mg2Ca, Al2Ca, Al8Mn5, Al-Si precipitate etc., and a small amount of ternary phase.In thermal treatment or thermomechanical machining deformation process, can generate Regulation G .P district and other precipitate of other micro/nano level (as Al-Ca, Al-Mn-Ca etc.) of high-temperature stable, organize by its steady-state deformation, reinforced alloys, is conducive to material and obtains high strength and high heat resistance energy.
The preparation method of the non-rare earth-magnesium alloy board of low-cost and high-performance of the present invention, comprises the following steps:
1) smelt, cast
By the chemical composition of claim 1, by Al, Ca, Mn, Si and Mg alloying element proportioning, add in the mode of high pure raw material or master alloy; Pure Mg ingot and Mg-Mn master alloy are put into the crucible of smelting furnace, at CO
2and SF
6the protection of hybrid protection gas under fusing completely, CO
2and SF
6throughput ratio scope be 40～100, raw material temperature rise rate is controlled at 15～50 DEG C/min, after fusing, the temperature of solution is controlled at 710～760 DEG C; All the other pure metal ingots and master alloy are placed in preheating oven and are heated to 200～280 DEG C; After pure Mg ingot and Mg-Mn master alloy melt completely, other pure Al ingot, master alloy and Ca particle after preheating or Mg-Ca master alloy are successively added in solution melt, while adding Ca, need blowing argon gas refining stirring, be incubated 5～10 minutes; Then adopt die cast or semicontinuous casting to be prepared into ingot casting;
2) ingot casting cuts into rolling blank after homogenizing is processed;
3) rolling.
To the preheating of rolling blank, preheating temperature is 300～500 DEG C, and be 25～60min warm up time, and roll is preheated to 200～300 DEG C; Roll speed is 20～60m/min, and single pass draught is 30%～50%, and every time rolling finishes rear sheet material and directly carries out reverse rolling, does not carry out any guarantor's mild heat; Accumulative total deflection >=90% of sheet material; After finish to gauge, sheet material carries out air cooling.
Further, in step 2) in, homogenizing cast ingot is carried out 0.1～48 hour at 490～510 DEG C, then cuts into rolling blank.
As everyone knows, alloy material, by grain refining, can obtain better mechanical property, can not only improve its working plasticity, and can improve its intensity etc., reduces material mechanical performance anisotropy.Other alloys such as the relative iron of magnesium alloy, aluminium have the k-factor of larger Hall-Petch relation, and the contribution of the strength enhancing of its grain refining alloy is more obvious.In order to obtain more tiny crystal grain, further to improve intensity and toughness and other advantageous property of magnesium alloy, generally adopt thermal distortion processing.In the deformation processing processes such as extruding, rolling, forging, the thick second-phase that casting forms obtains gradually broken refinement and disperse is distributed in magnesium matrix, and the mechanical property of alloy is further improved, and obtains more high strength and plasticity.
Make alloy grain refinement also be conducive to various slip system combined launch in secondary deformation process by hot-work, compatible deformation, overcomes in magnesium alloy due to the serious anisotropy of the less mechanical property causing of close-packed hexagonal alloy slip system.On the other hand, because crystal grain is tiny, Grain Boundary Sliding mode of texturing is easily activated, and alloy deformation homogeneity increases; The ratio that the distortion that grain refining causes Grain Boundary Sliding to produce occupies in material gross plastic deformation increases, and is also conducive to the anisotropic reduction of material mechanical performance.
Meanwhile, the tiny precipitation particles that a large amount of disperses distribute exists, and also can produce obvious impact for material anisotropy.On the one hand, the existence of small and dispersed precipitated phase, can make the alloy of thermo-mechanical deformation form the texture of disperse more, is conducive to form the Deformation structure of weak anisotropy; On the other hand, the existence of a large amount of tiny precipitated phases can effectively suppress twin occurrence probability in stretching or compression set process, thereby weakens the anisotropic degree of material mechanical performance.Therefore, introduce suitable second phase particles, for the Mechanical Property Anisotropy feature of controlling alloy, have very important significance.
Contrast existing magnesium alloy, advantage of the present invention is mainly manifested in:
1. microalloying, cost of alloy are low: low-cost and high-performance magnesium alloy plate prepared by the present invention is made up of conventional alloy element Al, Ca, Mn, Si, alloy element total addition level≤2.0wt.%, and do not add rare earth element and high price element;
2. rolling efficiency is high, one-pass roller amount is large, energy consumption is low: low-cost and high-performance magnesium alloy plate prepared by the present invention, roll speed is 20～60m/min, single pass draught is 30～50%, and in the operation of rolling, does not need blank repeatedly to heat, and saves time and the energy;
3. gained sheet material anisotropy of mechanical properties is low: the logical excessive strain of the present invention is lowered the temperature repeatedly, and low-cost and high-performance magnesium alloy plate crystal grain prepared by continuous rolling is tiny, homogeneous microstructure; Second-phase is tiny, disperse distributes; (0002) when basal plane texture is effectively weakened and observes from rolling surface (ND), (0002) basal plane texture is becoming within the scope of 10～30 ° and is forming bimodal distribution with rolling direction, anisotropy when many factors reduces sheet material deformation at room temperature effectively;
4. normal temperature mechanical property excellence: low-cost and high-performance magnesium alloy plate prepared by the present invention tensile strength is at room temperature 260～320MPa, and yield strength is 215～290MPa, and elongation is 10～22%.
Brief description of the drawings
Fig. 1 is the as cast condition optical texture of the non-magnesium-rare earth of the embodiment of the present invention.
Fig. 2 is the solid solution state optical texture of the non-magnesium-rare earth of the embodiment of the present invention.
Fig. 3 is the scanning electron microscope tissue of the non-magnesium-rare earth of the embodiment of the present invention.
Fig. 4 is the outside drawing in kind after the rolling different distortion amount of the non-magnesium-rare earth of the embodiment of the present invention.
Fig. 5 is the secondary electron photo of the non-magnesium-rare earth of embodiment of the present invention 1.2mm sheet material after finish to gauge.
Fig. 6 is that the EBSD of the non-magnesium-rare earth of embodiment of the present invention 1.2mm sheet material after finish to gauge organizes photo.
Fig. 7 is that photo is organized in the transmission of the non-magnesium-rare earth of embodiment of the present invention 1.2mm sheet material after finish to gauge.
Fig. 8 is (0002) and (11-20) utmost point figure of the non-magnesium-rare earth of embodiment of the present invention 1.2mm sheet material after finish to gauge.
Fig. 9 is that the non-magnesium-rare earth of embodiment of the present invention 1.2mm sheet material after finish to gauge is parallel to rolling direction (0 °), the room temperature tensile performance during perpendicular to rolling direction (90 °) and with rolling direction (45 °) at 45 °.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention will be further described.
The non-magnesium-rare earth of low-cost and high-performance of the present invention, its composition weight percent is: 0.50%Al, 0.71%Ca, 0.31%Mn, 0.11%Si, all the other are Mg (Mg-0.50Al-0.71Ca-0.31Mn-0.11Si).
Utilize metal mould casting fabrication technique to prepare the square ingot casting that thickness is 200mm for 50mm, width for 200mm, height, cast structure is as Fig. 1, to after ingot casting cutting, carry out the homogenizing processing of 24 hours at 500 DEG C, the thick second-phase quantity existing under its as cast condition obviously reduces (as Fig. 2), and Secondary element is entered in matrix by solid solution; Scanning electron microscope mirco structure shows, the disperse second phase particles that only has a small amount of size to be less than the tiny second phase particles of several microns and some nanoscales is distributed in matrix, alloy is realized microstructure homogenization (as Fig. 3), is beneficial to and adopts efficient rolling deformation technique in the follow-up operation of rolling.
Homogenizing alloy pig after treatment is cut into the square rolling blank that thickness is 15mm, length 150mm, width 150mm; Then blank is put into box-type furnace and is carried out the insulation of 30 minutes at 400 DEG C.Roll utilizes combustion gases to carry out preheating, and design temperature is 300 DEG C, utilizes 4 fixed infrared temperature-measuring guns to detect roller temperature.
Blank is carried out to large strain continuous rolling repeatedly, and single pass draught is about 40%, and roll speed is 40m/min, and 5 passage cumulative deformations reach 92%, and every time rolling finishes rear sheet material and do not carry out any guarantor's mild heat, directly carries out reverse rolling; Be about 1.2mm, gained sheet material naturally cooling in air through continuous repeat-rolling to thickness.
After rolling, the face shaping of sheet material sample segment changes as shown in Figure 4.Alloy, adopting single pass all not ftracture under compared with the texturizing condition of heavy reduction (40%), has shown good rolling deformation performance, and in the operation of rolling, rolling pass reduces, efficiency improves.
This alloy reaches 92% large strain repeatedly after continuous rolling through 5 pass deformations, and its scanning electron microscope tissue is as Fig. 5, Fig. 6.Sheet material after multi-pass rolling has even, tiny recrystallize fine grained texture, and grain refining is to 5 μ m left and right, and fine grained texture has ensured that alloy strength and plasticity, in higher level, are also conducive to reduce Mechanical Property Anisotropy.
After finish to gauge, in the tissue of alloy, due to the introducing of a large amount of viscous deformation, second-phase has been fractured into even fine particle, as shown in Fig. 7 transmission photo.A large amount of evenly tiny second-phase tissues of introducing in alloy, as Mg
2ca, Al
8mn
5equate, their alloys produce strong strengthening effect; Meanwhile, also effectively reduced the anisotropic degree of sheet material mechanical property.
From the microcosmic texture of rolling surface (ND) observation sheet material, (0002) basal plane Texture becomes the weak bimodal distribution of formation within the scope of 15 ° with rolling direction, as shown in Figure 8, the crystalline orientation of sheet material along plate face different directions distribute more even, this material organize isotropy better.
Mechanical experimental results shows, finish to gauge sheet material is along being parallel to rolling direction (0 °), be respectively perpendicular to rolling direction (90 °) and with the room temperature tensile strength of rolling direction (45 °) at 45 ° direction: 289MPa, 274MPa, 277MPa, yield strength is respectively: 280MPa, 235MPa, 254MPa, unit elongation is respectively: 18%, 15%, 19%, as shown in Figure 9.Bill of material has revealed good intensity and plasticity, also has lower anisotropic character simultaneously.
Other embodiments of the invention are referring to table 1.
Embodiment 1
The composition weight percent of the non-magnesium-rare earth alloy of the present embodiment low-cost and high-performance is: 0.50%Al, and 0.71%Ca, 0.31%Mn, 0.11%Si, all the other are Mg; (Mg-0.50Al-0.71Ca-0.31Mn-0.11Si).
1) press massfraction by Al, Ca, Mn, Si and Mg alloying element proportioning, add in the mode of high pure raw material or master alloy; Pure Mg ingot and Mg-Mn master alloy are put into the crucible of smelting furnace, at CO
2and SF
6the protection of hybrid protection gas under fusing completely, CO
2and SF
6throughput ratio be 50, raw material temperature rise rate is controlled at 15～50 DEG C/min, after fusing, the temperature of solution is controlled at 710～760 DEG C; All the other pure metal ingots and master alloy are placed in preheating oven and are heated to 200～280 DEG C.After pure Mg ingot and Mg-Mn master alloy are melted completely, other pure metal ingot after preheating, master alloy are successively added in liquation melt, while adding Ca, need blowing argon gas refining stirring, be incubated 10 minutes; Then adopt die cast or semicontinuous casting to be prepared into ingot casting.
2) by processing and obtain uniform formation 500 DEG C of homogenizing of carrying out 24 hours after ingot casting cutting, ingot casting after treatment homogenizing is cut into the square rolling blank that thickness is 15mm;
3) blank is put into box-type furnace and carried out the insulation of 30 minutes at 400 DEG C, roll utilizes combustion gases to heat, and design temperature is 300 DEG C, utilizes 4 fixed infrared temperature-measuring guns to detect roller temperature;
4) blank is carried out to the large strain of the 5 passage continuous rolling repeatedly of lowering the temperature, roll speed is 40m/min, and single pass draught is 40%, and cumulative deformation is 92%, and every time rolling finishes rear sheet material and do not carry out any guarantor's mild heat, directly carries out reverse rolling; Be about 1.2mm, gained sheet material naturally cooling in air through continuous repeat-rolling to thickness.
Finish to gauge sheet material is along being parallel to rolling direction (0 °), be respectively perpendicular to rolling direction (90 °) and with the room temperature tensile strength of rolling direction (45 °) at 45 °: 289MPa, 274MPa, 277MPa, yield strength is respectively: 280MPa, 235MPa, 254MPa, unit elongation is respectively: 18%, 15%, 19%.
Embodiment 2
1) the non-magnesium-rare earth alloy of the present embodiment low-cost and high-performance, its composition weight percent is: Mg-0.36Al-0.50Ca-0.35Mn-0.05Si.Adopt melting method as similar in embodiment 1, utilize metal mould casting fabrication technique to prepare ingot casting;
2) by processing and obtain uniform formation 510 DEG C of homogenizing of carrying out 18 hours after ingot casting cutting, ingot casting after treatment homogenizing is cut into rolling blank;
3) blank is put into box-type furnace and carried out the insulation of 30 minutes at 425 DEG C, roll utilizes combustion gases to heat, and design temperature is 300 DEG C;
4) blank is carried out to the large strain of the multi-pass continuous rolling repeatedly of lowering the temperature, roll speed is 30m/min, and single pass draught is 35%, and cumulative deformation is 95%, and every time rolling finishes rear sheet material and do not carry out any guarantor's mild heat, directly carries out reverse rolling; Be about 1mm, gained sheet material naturally cooling in air through continuous repeat-rolling to thickness.
Finish to gauge sheet material is along being parallel to rolling direction (0 °), be respectively perpendicular to rolling direction (90 °) and with the room temperature tensile strength of rolling direction (45 °) at 45 °: 275MPa, 265MPa, 260MPa, yield strength is respectively: 230MPa, 225MPa, 215MPa, unit elongation is respectively: 21%, 22%, 17%.
Embodiment 3
1) the non-magnesium-rare earth of the present embodiment low-cost and high-performance, its composition weight percent is: Mg-0.55Al-0.51Ca-0.30Mn-0.15Si.Adopt melting method as similar in embodiment 1, utilize semicontinuous casting technique to prepare ingot casting;
2) by processing and obtain uniform formation 505 DEG C of homogenizing of carrying out 22 hours after ingot casting cutting, ingot after treatment homogenizing is cut into rolling blank;
3) blank is put into box-type furnace and carried out the insulation of 30 minutes at 450 DEG C, roll utilizes combustion gases to heat, and design temperature is 300 DEG C;
4) blank is carried out to the large strain of the multi-pass continuous rolling repeatedly of lowering the temperature, roll speed is 35m/min, and single pass draught is 35%, and cumulative deformation is 92%, and every time rolling finishes rear sheet material and do not carry out any guarantor's mild heat, directly carries out reverse rolling; Be about 1.2mm, gained sheet material naturally cooling in air through continuous repeat-rolling to thickness.
Finish to gauge sheet material is along being parallel to rolling direction (0 °), be respectively perpendicular to rolling direction (90 °) and with the room temperature tensile strength of rolling direction (45 °) at 45 °: 280MPa, 272MPa, 270MPa, yield strength is respectively: 280MPa, 252MPa, 250MPa, unit elongation is respectively: 15%, 20%, 18%.
Embodiment 4
1) the non-magnesium-rare earth of the present embodiment low-cost and high-performance, its composition weight percent is Mg-0.20Al-0.11Ca-0.15Mn-0.02Si.Adopt melting method as similar in embodiment 1, utilize metal mould casting fabrication technique to prepare ingot casting;
2) by processing and obtain uniform formation 500 DEG C of homogenizing of carrying out 24 hours after ingot casting cutting, ingot after treatment homogenizing is cut into rolling blank;
3) blank is put into box-type furnace and carried out the insulation of 30 minutes at 425 DEG C, roll utilizes combustion gases to heat, and design temperature is 300 DEG C;
4) blank is carried out to the large strain of the multi-pass continuous rolling repeatedly of lowering the temperature, roll speed is 30m/min, and single pass draught is 45%, and cumulative deformation is 95%, and every time rolling finishes rear sheet material and do not carry out any guarantor's mild heat, directly carries out reverse rolling; Be about 1.1mm, gained sheet material naturally cooling in air through continuous repeat-rolling to thickness.
Finish to gauge sheet material is along being parallel to rolling direction (0 °), be respectively perpendicular to rolling direction (90 °) and with the room temperature tensile strength of rolling direction (45 °) at 45 °: 273MPa, 269MPa, 268MPa, yield strength is respectively: 239MPa, 228MPa, 225MPa, unit elongation is respectively: 17%, 20%, 18%.
Embodiment 5
1) the non-magnesium-rare earth of the present embodiment low-cost and high-performance, its composition weight percent is: Mg-0.60Al-0.78Ca-0.28Mn-0.24Si.Adopt melting method as similar in embodiment 1, utilize semicontinuous casting technique to prepare ingot casting;
2) ingot casting is processed and obtained uniform formation 390 DEG C of homogenizing of carrying out 18 hours, ingot after treatment homogenizing is cut into rolling blank;
3) blank is put into box-type furnace and carried out the insulation of 20 minutes at 415 DEG C, roll utilizes combustion gases to heat, and design temperature is 300 DEG C;
4) blank is carried out to the large strain of the multi-pass continuous rolling repeatedly of lowering the temperature, roll speed is 25m/min, and single pass draught is 45%, and cumulative deformation is 95%, and every time rolling finishes rear sheet material and do not carry out any guarantor's mild heat, directly carries out reverse rolling; Be about 0.9mm, gained sheet material naturally cooling in air through continuous repeat-rolling to thickness.
Finish to gauge sheet material is along being parallel to rolling direction (0 °), be respectively perpendicular to rolling direction (90 °) and with the room temperature tensile strength of rolling direction (45 °) at 45 °: 320MPa, 310MPa, 305MPa, yield strength is respectively: 290MPa, 280MPa, 285MPa, unit elongation is respectively: 10%, 13%, 11%.
Embodiment 6
1) weight percent of the non-magnesium-rare earth microalloying of this example design low-cost and high-performance composition is: Mg-0.10Al-0.23Ca-0.12Mn-0.30Si.Adopt melting method as similar in embodiment 1, utilize metal mould casting fabrication technique to prepare ingot casting;
2) ingot casting is processed and obtained uniform formation 505 DEG C of homogenizing of carrying out 20 hours, ingot after treatment homogenizing is cut into rolling blank;
3) blank is put into box-type furnace and carried out the insulation of 50 minutes at 450 DEG C, roll utilizes combustion gases to heat, and design temperature is 300 DEG C;
4) blank is carried out to the large strain of the multi-pass continuous rolling repeatedly of lowering the temperature, roll speed is 40m/min, and single pass draught is about 45%, and cumulative deformation is about 95%, every time rolling finishes rear sheet material and does not carry out any guarantor's mild heat, directly carries out reverse rolling; Be about 1.0mm, gained sheet material naturally cooling in air through continuous repeat-rolling to thickness.
Finish to gauge sheet material is along being parallel to rolling direction (0 °), be respectively perpendicular to rolling direction (90 °) and with the room temperature tensile strength of rolling direction (45 °) at 45 °: 272MPa, 268MPa, 265MPa, yield strength is respectively: 270MPa, 264MPa, 258MPa, unit elongation is respectively: 14%, 16%, 12%.
Table 1
Claims (3)
1. the non-rare earth-magnesium alloy board of low-cost and high-performance, its chemical component weight per-cent is: Al0.1～0.6%, Ca0.1～0.8%, Mn0.1～0.4%, Si0.01～0.3%, all the other are Mg and inevitable impurity.
2. the preparation method of the non-rare earth-magnesium alloy board of low-cost and high-performance as claimed in claim 1, is characterized in that, comprises the following steps:
1) smelt, cast
By the chemical composition of claim 1, by Al, Ca, Mn, Si and Mg alloying element proportioning, add in the mode of high pure raw material or master alloy; Pure Mg ingot and Mg-Mn master alloy are put into the crucible of smelting furnace, at CO
2and SF
6the protection of hybrid protection gas under fusing completely, CO
2and SF
6throughput ratio scope be 40～100, raw material temperature rise rate is controlled at 15～50 DEG C/min, after fusing, the temperature of solution is controlled at 710～760 DEG C; All the other pure metal ingots and master alloy are placed in preheating oven and are heated to 200～280 DEG C; After pure Mg ingot and Mg-Mn master alloy melt completely, other pure Al ingot, master alloy and Ca particle after preheating or Mg-Ca master alloy are successively added in solution melt, while adding Ca, need blowing argon gas refining stirring, be incubated 5～10 minutes; Then adopt die cast or semicontinuous casting to be prepared into ingot casting;
2) ingot casting cuts into rolling blank after homogenizing is processed;
3) rolling
To the preheating of rolling blank, preheating temperature is 300～500 DEG C, and be 25～60min warm up time, and roll is preheated to 200～300 DEG C; Roll speed is 20～60m/min, and single pass draught is 30%～50%, and every time rolling finishes rear sheet material and directly carries out reverse rolling, does not carry out any guarantor's mild heat; Accumulative total deflection >=90% of sheet material; After finish to gauge, sheet material carries out air cooling.
3. the preparation method of the non-rare earth-magnesium alloy board of low-cost and high-performance as claimed in claim 2, is characterized in that: in step 2) in, homogenizing cast ingot is carried out 0.1～48 hour at 490～510 DEG C, then cuts into rolling blank.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108570583A (en) * | 2018-06-08 | 2018-09-25 | 哈尔滨工业大学 | Without rare earth low-alloy ultra-high strength and toughness magnesium alloy and preparation method thereof |
| CN109022973A (en) * | 2018-06-26 | 2018-12-18 | 无锡福镁轻合金科技有限公司 | A kind of deformed magnesium alloy material and its preparation process of middle high-strength and high-plasticity |
| CN111360097A (en) * | 2020-03-23 | 2020-07-03 | 哈尔滨工业大学（威海） | Preparation method of ultrahigh-strength magnesium alloy plate |
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| GB974571A (en) * | 1962-06-05 | 1964-11-04 | Magnesium Elektron Ltd | Improvements in or relating to magnesium base alloys |
| EP2168695A1 (en) * | 2004-06-30 | 2010-03-31 | Sumitomo Electric Industries, Ltd. | Method of producing a magnesium-alloy meterial |
| CN102051509A (en) * | 2010-12-28 | 2011-05-11 | 西安工业大学 | High-toughness heat-resistant Mg-Al-RE-Mn wrought magnesium alloy and preparation method of plate made of same |
| CN102978498A (en) * | 2012-12-18 | 2013-03-20 | 中国科学院长春应用化学研究所 | Rare-earth magnesium alloy and preparation method thereof |
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| GB974571A (en) * | 1962-06-05 | 1964-11-04 | Magnesium Elektron Ltd | Improvements in or relating to magnesium base alloys |
| EP2168695A1 (en) * | 2004-06-30 | 2010-03-31 | Sumitomo Electric Industries, Ltd. | Method of producing a magnesium-alloy meterial |
| CN102051509A (en) * | 2010-12-28 | 2011-05-11 | 西安工业大学 | High-toughness heat-resistant Mg-Al-RE-Mn wrought magnesium alloy and preparation method of plate made of same |
| CN102978498A (en) * | 2012-12-18 | 2013-03-20 | 中国科学院长春应用化学研究所 | Rare-earth magnesium alloy and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108570583A (en) * | 2018-06-08 | 2018-09-25 | 哈尔滨工业大学 | Without rare earth low-alloy ultra-high strength and toughness magnesium alloy and preparation method thereof |
| CN108570583B (en) * | 2018-06-08 | 2020-06-09 | 哈尔滨工业大学 | Rare earth-free low-alloy magnesium alloy with ultrahigh strength and toughness and preparation method thereof |
| CN109022973A (en) * | 2018-06-26 | 2018-12-18 | 无锡福镁轻合金科技有限公司 | A kind of deformed magnesium alloy material and its preparation process of middle high-strength and high-plasticity |
| CN111360097A (en) * | 2020-03-23 | 2020-07-03 | 哈尔滨工业大学（威海） | Preparation method of ultrahigh-strength magnesium alloy plate |
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| CN104060138B (en) | 2016-10-05 |
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