CN104294068A - Process method capable of improving refinement and modification effects of A356 aluminum alloy - Google Patents
Process method capable of improving refinement and modification effects of A356 aluminum alloy Download PDFInfo
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- CN104294068A CN104294068A CN201410533429.7A CN201410533429A CN104294068A CN 104294068 A CN104294068 A CN 104294068A CN 201410533429 A CN201410533429 A CN 201410533429A CN 104294068 A CN104294068 A CN 104294068A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 109
- 230000000694 effects Effects 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000004048 modification Effects 0.000 title abstract description 10
- 238000012986 modification Methods 0.000 title abstract description 10
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 104
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- 230000008018 melting Effects 0.000 claims abstract description 20
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 241000209456 Plumbago Species 0.000 claims description 21
- 229910002804 graphite Inorganic materials 0.000 claims description 18
- 238000007670 refining Methods 0.000 claims description 17
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- 238000004140 cleaning Methods 0.000 claims description 16
- 239000012535 impurity Substances 0.000 claims description 16
- 238000009413 insulation Methods 0.000 claims description 16
- 230000018044 dehydration Effects 0.000 claims description 11
- 238000006297 dehydration reaction Methods 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 238000010792 warming Methods 0.000 claims description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- 238000007872 degassing Methods 0.000 claims description 10
- 238000003672 processing method Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
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- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 claims description 5
- 238000002203 pretreatment Methods 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000005266 casting Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 238000005275 alloying Methods 0.000 abstract 1
- 239000011362 coarse particle Substances 0.000 abstract 1
- 239000002893 slag Substances 0.000 abstract 1
- 238000009864 tensile test Methods 0.000 description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
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- 229910052751 metal Inorganic materials 0.000 description 6
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- -1 wherein Si 7.00% Inorganic materials 0.000 description 3
- 229910000676 Si alloy Inorganic materials 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
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- 229910052782 aluminium Inorganic materials 0.000 description 1
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Abstract
一种能提高A356铝合金细化变质效果的工艺方法，属于铝合金熔铸技术领域，其特征为：以Al-10Sr中间合金为变质剂，以A356铝合金为变质对象，在熔炼Al-10Sr中间合金的步骤中，在彻底扒渣并将合金液中粗大的颗粒过滤去除后，将合金液快速浇入水冷铜模中得到经水冷铜模工艺处理的Al-10Sr中间合金，按经水冷铜模工艺处理的Al-10Sr中间合金加入量为A356铝合金熔体质量的0.10%-0.50%对A356铝合金进行细化变质处理，细化变质后A356铝合金的组织及性能都显著改善提高。
A process method capable of improving the refinement and modification effect of A356 aluminum alloy, which belongs to the technical field of aluminum alloy melting and casting, and is characterized in that: Al-10Sr master alloy is used as a modification agent, A356 aluminum alloy is used as a modification object, and in the middle of melting Al-10Sr In the step of alloying, after thoroughly removing slag and filtering out the coarse particles in the alloy liquid, the alloy liquid is quickly poured into the water-cooled copper mold to obtain the Al-10Sr master alloy processed by the water-cooled copper mold process, according to the water-cooled copper mold process. The amount of Al-10Sr master alloy treated by the process is 0.10%-0.50% of the mass of the A356 aluminum alloy melt, and the A356 aluminum alloy is refined and modified. After the refinement and modification, the structure and properties of the A356 aluminum alloy are significantly improved.
Description
technical field
The invention belongs to aluminum alloy melt casting technical field, refer in particular to a kind of processing method that can improve A356 aluminium alloy fine degenerate effect.
Background technology
A356 aluminium alloy is most widely used alloy in hypoeutectic Al-Si-Mg system alloy, and have good fluidity, without hot cracking tendency, linear shrinkage is little, and higher specific tenacity and good castability, be widely used in the industry such as Aeronautics and Astronautics, automobile, building.But in uninoculated A356 aluminium alloy, Si phase presents thick faller gill shape, makes the matrix of alloy seriously be isolated, and easily causes stress concentration at the tip of silicon phase and edges and corners, makes the strength of materials, plasticity, machinability significantly reduce.Therefore, for improving the mechanical property of A356 aluminium alloy, improving the process industrial art performance of A356 aluminium alloy, Metamorphism treatment need be carried out to A356 aluminium alloy.Because the modification effect of Al-10Sr master alloy to eutectic silicon is much better than other metals and alloy, the industrial Al-10Sr master alloy that generally adopts carries out Metamorphism treatment to A356 aluminium alloy at present, tiny through the Sr Eutectic Silicon in Al-Si Cast Alloys particle that goes bad, can significantly improve its process industrial art performance, improve the quality of A356 aluminium alloy, but because Al-10Sr master alloy tissue morphology is different, when adding Sr and measuring identical, produce visibly different impact to A356 aluminium alloy fine degenerate effect, the second-phase in Al-10Sr master alloy is mainly by the Al distributed in en plaque
4(the Al+Al of Sr phase and bunch distribution in strip on matrix
4sr) eutectic phase composition, A1
4after Sr in Sr compound is only converted into the Sr of free state, just can play its fine degenerate effect.The A1 that disperse is tiny
4sr phase due to specific surface area comparatively large, surface energy is higher, and its dissolution rate is very fast, makes that Sr atom is easily therefrom free out to be reduced surface energy, make Sr have good fine degenerate effect, and the A1 of thick sheet
4sr phase, skewness, then not easily make Sr atom therefrom dissociate out, fine degenerate effect is bad, and the second-phase form in the Al-10Sr master alloy namely added, size, distribution and condition of surface and energy produce directly impact to A356 aluminium alloy fine degenerate effect.Al-10Sr master alloy is in melting preparation process, the difference of melt solidifying condition will directly cause the difference of formed second-phase form, strong stirring is carried out to melt, vibration, can input energy from the external world impels nucleus to be formed in advance, take certain technological measure simultaneously, increase condensate depression, increase the heat exchange of melt and mould, melt temperature in liquid cave is reduced, the skeleton of broken crystallization front, there is the material-dendrite fragment that can be used as heterogeneous nucleation in a large number, thus nucleation rate is increased greatly, number of die after melt solidifying in unit volume also obviously increases thereupon, the second phase particles that more disperse that Al-10Sr master alloy distributes is tiny can be obtained, a certain amount of Al-10Sr master alloy is joined after the A356 aluminium alloy of fine degenerate, because Al-10Sr master alloy autologous tissue form has heredity, its tissue morphology will have hereditation to aluminum silicon alloy crystallization tissue, i.e. Al-10Sr master alloy fine degenerate effect hereditary effect in a organized way, this explanation, Al-10Sr master alloy is a kind of master alloy with hereditary effect.
Therefore, develop a kind of art treatment that significantly can improve Al-10Sr master alloy alterant tissue signature, A356 aluminium alloy fine degenerate effect can be significantly improved, and then obtain comparatively ideal Microstructure and properties, not only can small serial production but also can be mass-produced, reduce costs, there is important theory significance and great actual application value.
The present invention develops a kind of processing method that can improve A356 aluminium alloy fine degenerate effect.
Summary of the invention
The present invention develops a kind of processing method that can improve A356 aluminium alloy fine degenerate effect, with Al-10Sr master alloy for alterant: wherein Sr 9.00%-11.00%, Ti≤0.02%, Si≤0.12%, Fe≤0.06%, all the other impurity contents are each is not more than 0.05%, and surplus is Al; Rotten object is A356 aluminium alloy, wherein Si 6.50%-7.50%, Mg 0.20%-0.40%, Cu≤0.20%, Mn≤0.10%, Zn≤0.10%, Fe≤0.20%, Ti≤0.20%, all the other impurity contents are each is not more than 0.05%, and all the other are Al, and composition is calculated by mass percentage; Alterant usage quantity is the 0.10%-0.50% of A356 aluminium alloy quality.
melting technology is: first carry out pre-treatment, after Al-10Sr intermediate alloy ingot is cut into the bulk be of moderate size, carry out polishing, polishing to be to remove the oxide skin on surface, carry out cleaning in ultrasonic oscillation device with acetone, dry, weigh, melting auxiliary means ZnO coating is brushed, coat-thickness 1.0mm-1.5mm is dry for standby in 200 DEG C of-300 DEG C of chamber type electric resistance furnaces in temperature; Next carries out melting Al-10Sr master alloy, Al-10Sr master alloy is placed in internal cleaning clean and be preheated to the plumbago crucible of 450 DEG C-550 DEG C, and be placed in SG2-7.5-12 type resistance furnace the fusing that heats up, after the recessed deliquescing of melt, be sprinkled into the special insulating covering agent of aluminium alloy on its surface, completely after fusing, when being warming up to 690 DEG C-740 DEG C, with graphite rod powerful uniform stirring melt 1min, insulation 4min-6min makes each element homogenizing, passes into CCl
6degasification, with the dehydration ZnCl of 0.20% of graphite bell jar press-in Al-10Sr intermediate alloy melt quality
2to plumbago crucible, move horizontally, carry out refining, until complete reaction, leave standstill 4min-6min, when being cooled to 680 DEG C-700 DEG C, thoroughly skim, and thick particle filtration is removed by aluminium alloy high-temperature fibre filtering net, poured into fast in water cooled copper mould by aluminium alloy, take out master alloy after cooling, any impurity of plumbago crucible inner bottom part all must not pour Al-10Sr master alloy upper surface into, in order to avoid pollution master alloy, this technique is called Al-10Sr master alloy alterant water cooled copper mould art breading.
modification process is: the A356 aluminium alloy processed is placed in the clean also preheating plumbago crucible of internal cleaning, be placed in SG2-7.5-12 type resistance furnace the fusing that heats up, after A356 aluminium alloy all melts, when being warming up to 740 DEG C-780 DEG C, with graphite rod powerful uniform stirring melt 1min, insulation 6min-8min makes each element homogenizing, with the ZnCl of 0.20% dehydration of graphite bell jar press-in A356 aluminium alloy melt quality
2carry out refining, leave standstill 4min-6min, skim, the Al-10Sr master alloy alterant of 0.10%-0.50% through water cooled copper mould art breading of A356 aluminium alloy melt quality is added in melt, insulation 5min makes each element homogenizing, strong stirring, degasification, refining, leave standstill, be cooled to 730 DEG C, skim, filter, pour into respectively in steel mould, make metallographic specimen, and then often organize processing 3 metal mold tensile test bars by national Specification, room temperature tensile Mechanics Performance Testing is carried out on WE-10 type fluid pressure type tensile testing machine, rate of extension is 0.05mm/min, corresponding mechanical property of often organizing all is averaged, its numerical value is as shown in table 1, the Al-10Sr master alloy added through water cooled copper mould art breading goes bad the tensile strength of A356 aluminium alloy and elongation, according to room temperature tensile data of mechanical, to the Al-10Sr master alloy through water cooled copper mould art breading along with the increase of add-on, the tensile strength of alloy, elongation all reduces trend again in first rising, when alterant content reaches 0.30% of A356 aluminium alloy melt quality, tensile strength and the elongation of rotten rear A356 aluminium alloy all reach maximum value, i.e. tensile strength sigma
breach 249.38Mpa, elongation δ reaches 6.82%.
The table 1 Al-10Sr master alloy added through water cooled copper mould art breading goes bad the mechanical property of A356 aluminium alloy
| Al-10Sr master alloy massfraction, % | 0.00% | 0.10% | 0.20% | 0.30% | 0.40% | 0.50% |
| Tensile strength sigma b (MPa) | 182.56 | 230.34 | 236.61 | 249.38 | 243.05 | 239.57 |
| Elongation δ (%) | 1.09 | 4.53 | 5.24 | 6.82 | 6.07 | 5.66 |
Be elongated en plaque or minute hand sheet without the eutectic silicon pattern in the A356 aluminium alloy of fine degenerate, morphological differences is larger, in aluminum substrate, distribution does not have directivity, also irregular, edge, with sharp wedge angle, as shown in Figure 1, has a strong impact on the continuity of matrix, isolate matrix, mechanical property is lower.Along with adding of alterant makes α phase grain refining in A356 aluminium alloy, eutectic silicon form changes, thus improves the comprehensive mechanical property of alloy.But because Al-10Sr master alloy is a kind of master alloy with hereditary effect, tissue morphology has important hereditation to aluminum silicon alloy crystallization tissue, without the A1 Al-10Sr master alloy alterant of any art breading being dispersed with thick sheet
4sr, not easily makes Sr atom therefrom dissociate out, as shown in Figure 2; When to add the Al-10Sr master alloy alterant usage quantity without any art breading be 0.30% of A356 aluminium alloy quality, although morphology of eutectic silicon great majority there occurs change, the coralliform become, but also have minority to be particulate state, as shown in Figure 3, therefore fine degenerate effect also has very large room for promotion.Under alterant add-on same case, on the Al-10Sr master alloy of water cooled copper mould art breading, be dispersed with the tiny A1 of disperse
4sr, because specific surface area is comparatively large, surface energy is higher, and its dissolution rate is very fast, Sr atom is easily therefrom dissociated out, as shown in Figure 4; When be A356 aluminium alloy quality through the Al-10Sr master alloy alterant add-on of water cooled copper mould art breading being 0.30%, Sr is made to have good fine degenerate effect, eutectic silicon nearly all becomes that very disperse, tiny particle, sphericity are higher, clear-cut, main integrated distribution equably at grain boundaries, as shown in Figure 5.
Technical problem to be solved by this invention to overcome in industrial production the conventional Al-10Sr master alloy alterant without any art breading to go bad the deficiency of A356 aluminum alloy organization and performance, there is provided by Al-10Sr master alloy after water cooled copper mould art breading, significantly improve tissue topography's feature of its fine degenerate alloy and the intensity of effective raising A356 aluminium alloy and plasticity etc.
accompanying drawing illustrates:
The A356 aluminium alloy micostructure schematic diagram of the non-fine degenerate of Fig. 1.
Fig. 2 is without the Al-10Sr master alloy microstructure schematic diagram of any art breading.
Fig. 3 add-on is the 0.30% A356 aluminium alloy micostructure schematic diagram gone bad without the Al-10Sr master alloy of any art breading of A356 aluminium alloy melt quality.
Fig. 4 is through the Al-10Sr master alloy microstructure schematic diagram of water cooled copper mould art breading
Fig. 5 add-on is that 0.30% of A356 aluminium alloy melt quality to go bad A356 aluminium alloy micostructure schematic diagram through the Al-10Sr master alloy of water cooled copper mould art breading.
Embodiment
embodiment 1
With Al-10Sr master alloy for alterant: wherein Sr 10.00%, Ti≤0.02%, Si≤0.12%, Fe≤0.06%, all the other impurity contents are each is not more than 0.05%, and surplus is Al, rotten object is A356 aluminium alloy, wherein Si 7.00%, Mg 0.30%, Cu≤0.20%, Mn≤0.10%, Zn≤0.10%, Fe≤0.20%, Ti≤0.20%, all the other impurity contents are each is not more than 0.05%, all the other are Al, and composition is calculated by mass percentage, and alterant usage quantity is 0.10% of A356 aluminium alloy quality.
melting technology is: first carry out pre-treatment, after Al-10Sr intermediate alloy ingot is cut into the bulk be of moderate size, carry out sanding and polishing to remove the oxide skin on surface, carry out cleaning in ultrasonic oscillation device with acetone, dry, weigh, melting auxiliary means ZnO coating is brushed, coat-thickness 1.0mm-1.5mm is dry for standby in 200 DEG C of-300 DEG C of chamber type electric resistance furnaces in temperature; Next carries out melting master alloy, Al-10Sr master alloy is placed in the plumbago crucible of the clean also preheating of internal cleaning, and be positioned in SG2-7.5-12 type resistance furnace the fusing that heats up, after the recessed deliquescing of melt, be sprinkled into the special insulating covering agent of aluminium alloy on its surface, completely after fusing, when being warming up to 720 DEG C, with high-quality graphite rod powerful uniform stirring melt 1min, insulation 5min makes each element homogenizing, passes into CCl
6degasification, with the dehydration ZnCl of 0.20% of graphite bell jar press-in Al-10Sr intermediate alloy melt quality
2to plumbago crucible, move horizontally, carry out refining, until complete reaction, leave standstill 5min, when being cooled to 690 DEG C, thoroughly skim, and thick particle filtration is removed by aluminium alloy high-temperature fibre filtering net, aluminium alloy is poured into fast in thickness 20mm, length 200mm, width 140mm water cooled copper mould, take out master alloy after cooling, any impurity of plumbago crucible inner bottom part must not pour Al-10Sr master alloy upper surface into, in order to avoid pollute master alloy.
modification process is: the A356 aluminium alloy processed is placed in the clean also preheating plumbago crucible of two internal cleanings, be placed in SG2-7.5-12 type resistance furnace the fusing that heats up successively, after A356 aluminium alloy all melts, when being warming up to 760 DEG C, with graphite rod powerful uniform stirring melt 1min, insulation 7min, with the ZnCl of 0.20% dehydration of bell jar press-in A356 aluminium alloy melt quality
2carry out refining, leave standstill 5min, skim, 0.10% of A356 aluminium alloy melt quality is added through the Al-10Sr master alloy alterant of water cooled copper mould art breading in one of them melt, in another melt, add-on is also 0.10% of A356 aluminium alloy melt quality without the Al-10Sr master alloy alterant of any art breading, insulation 5min makes each element homogenizing, strong stirring, degasification, refining, leave standstill, be cooled to 730 DEG C, skim, filter, pour into respectively in steel mould, make metallographic specimen, processing 3 metal mold tensile test bars are often organized again by national Specification, room temperature tensile Mechanics Performance Testing is carried out on WE-10 type fluid pressure type tensile testing machine, rate of extension is 0.05mm/min, corresponding mechanical property of often organizing all is averaged, now, Al-10Sr master alloy through water cooled copper mould art breading goes bad, and the tensile strength of A356 aluminium alloy is 230.34Mpa, elongation is 4.53%, going bad compared with the Al-10Sr master alloy without any art breading, the tensile strength of A356 aluminium alloy is 208.16Mpa, elongation is 3.73%, improves 10.66%, 21.44% respectively.
embodiment 2
With Al-10Sr master alloy for alterant: wherein Sr 10.00%, Ti≤0.02%, Si≤0.12%, Fe≤0.06%, all the other impurity contents are each is not more than 0.05%, and surplus is Al, rotten object is A356 aluminium alloy, wherein Si 7.00%, Mg 0.30%, Cu≤0.20%, Mn≤0.10%, Zn≤0.10%, Fe≤0.20%, Ti≤0.20%, all the other impurity contents are each is not more than 0.05%, all the other are Al, and composition is calculated by mass percentage, and alterant usage quantity is 0.30% of A356 aluminium alloy quality.
melting technology is: first carry out pre-treatment, after Al-10Sr intermediate alloy ingot is cut into the bulk be of moderate size, carry out sanding and polishing to remove the oxide skin on surface, carry out cleaning in ultrasonic oscillation device with acetone, dry, weigh, melting auxiliary means ZnO coating is brushed, coat-thickness 1.0mm-1.5mm is dry for standby in 200 DEG C of-300 DEG C of chamber type electric resistance furnaces in temperature; Next carries out melting master alloy, Al-10Sr master alloy is placed in the plumbago crucible of the clean also preheating of internal cleaning, and be positioned in SG2-7.5-12 type resistance furnace the fusing that heats up, after the recessed deliquescing of melt, be sprinkled into the special insulating covering agent of aluminium alloy on its surface, completely after fusing, when being warming up to 720 DEG C, with high-quality graphite rod powerful uniform stirring melt 1min, insulation 5min makes each element homogenizing, passes into CCl
6degasification, with the dehydration ZnCl of 0.20% of graphite bell jar press-in Al-10Sr intermediate alloy melt quality
2to plumbago crucible, move horizontally, carry out refining, until complete reaction, leave standstill 5min, when being cooled to 690 DEG C, thoroughly skim, and thick particle filtration is removed by aluminium alloy high-temperature fibre filtering net, aluminium alloy is poured into fast in thickness 20mm, length 200mm, width 140mm water cooled copper mould, take out master alloy after cooling, any impurity of plumbago crucible inner bottom part all must not pour Al-10Sr master alloy upper surface into, in order to avoid pollute master alloy.
modification process is: the A356 aluminium alloy gold handled well is placed in the clean also preheating plumbago crucible of two internal cleanings, be placed in SG2-7.5-12 type resistance furnace the fusing that heats up again, after alloy all melts, when being warming up to 760 DEG C, with graphite rod powerful uniform stirring melt 1min, insulation 7min, with the dehydration ZnCl of 0.20% of bell jar press-in A356 aluminium alloy melt quality
2carry out refining, after leaving standstill 5min, skim, 0.30% of A356 aluminium alloy melt quality is added through the Al-10Sr master alloy alterant of water cooled copper mould art breading in one of them melt, in another melt, add-on is also 0.30% of A356 aluminium alloy melt quality without the Al-10Sr intermediate alloy ingot alterant of any art breading, insulation 5min makes each element homogenizing, strong stirring, degasification, refining, leave standstill, be cooled to 730 DEG C, skim, filter, pour into respectively in steel mould, make metallographic specimen, processing 3 metal mold tensile test bars are often organized again by national Specification, room temperature tensile Mechanics Performance Testing is carried out on WE-10 type fluid pressure type tensile testing machine, rate of extension is 0.05mm/min, corresponding mechanical property of often organizing all is averaged, now, Al-10Sr master alloy through water cooled copper mould art breading goes bad, and the tensile strength of A356 aluminium alloy is 249.38Mpa, elongation is 6.82%, going bad compared with the Al-10Sr master alloy without any art breading, the tensile strength of A356 aluminium alloy is 222.97Mpa, elongation is 5.47%, improves 11.84%, 24.68% respectively.
embodiment 3
With Al-10Sr master alloy for alterant: wherein Sr 10.00%, Ti≤0.02%, Si≤0.12%, Fe≤0.06%, all the other impurity contents are each is not more than 0.05%, and surplus is Al, rotten object is A356 aluminium alloy, wherein Si 7.00%, Mg 0.30%, Cu≤0.20%, Mn≤0.10%, Zn≤0.10%, Fe≤0.20%, Ti≤0.20%, all the other impurity contents are each is not more than 0.05%, all the other are Al, and composition is calculated by mass percentage, and alterant usage quantity is 0.50% of A356 aluminium alloy quality.
melting technology is: first carry out pre-treatment, after Al-10Sr intermediate alloy ingot is cut into the bulk be of moderate size, carry out sanding and polishing to remove the oxide skin on surface, carry out cleaning in ultrasonic oscillation device with acetone, dry, weigh, melting auxiliary means ZnO coating is brushed, coat-thickness 1.0mm-1.5mm is dry for standby in 200 DEG C of-300 DEG C of chamber type electric resistance furnaces in temperature; Next carries out melting master alloy, Al-10Sr master alloy is placed in the clean also preheating plumbago crucible of internal cleaning, and be positioned in SG2-7.5-12 type resistance furnace the fusing that heats up, after the recessed deliquescing of melt, be sprinkled into the special insulating covering agent of aluminium alloy on its surface, completely after fusing, when being warming up to 720 DEG C, with high-quality graphite rod powerful uniform stirring melt 1min, insulation 5min makes each element homogenizing, passes into CCl
6degasification, with the dehydration ZnCl of 0.20% of graphite bell jar press-in Al-10Sr intermediate alloy melt quality
2to plumbago crucible, move horizontally, carry out refining, until complete reaction, leave standstill 5min, when being cooled to 690 DEG C, thoroughly skim, and thick particle filtration is removed by aluminium alloy high-temperature fibre filtering net, aluminium alloy is poured into fast in thickness 20mm9, length 200mm, width 140mm water cooled copper mould, cooling, any impurity of plumbago crucible inner bottom part all must not pour Al-10Sr master alloy upper surface into, in order to avoid pollute master alloy.
modification process is: the A356 aluminium alloy processed is placed in the clean also preheating plumbago crucible of two internal cleanings, be placed in SG2-7.5-12 type resistance furnace the fusing that heats up again, after A356 aluminium alloy all melts, when being warming up to 760 DEG C, with graphite rod powerful uniform stirring melt 1min, insulation 7min, with the dehydration ZnCl of 0.20% of bell jar press-in A356 aluminium alloy melt quality
2carry out refining, after leaving standstill 5min, skim, 0.50% of A356 aluminium alloy melt quality is added through the Al-10Sr master alloy alterant of water cooled copper mould art breading in one of them melt, in another melt, add-on is also 0.50% of A356 aluminium alloy melt quality without the Al-10Sr intermediate alloy ingot alterant of any art breading, insulation 5min makes each element homogenizing, strong stirring, degasification, refining, leave standstill, be cooled to 730 DEG C, skim, filter, pour into respectively in steel mould, make metallographic specimen, processing 3 metal mold tensile test bars are often organized again by national Specification, room temperature tensile Mechanics Performance Testing is carried out on WE-10 type fluid pressure type tensile testing machine, rate of extension is 0.05mm/min, corresponding mechanical property of often organizing all is averaged, now, Al-10Sr master alloy through water cooled copper mould art breading goes bad, and the tensile strength of A356 aluminium alloy is 239.57Mpa, elongation is 5.66%, going bad compared with the Al-10Sr master alloy without any art breading, the tensile strength of A356 aluminium alloy is 213.65Mpa, elongation is 4.98%, improves 12.13%, 13.65% respectively.
comparative example
With as cast condition A356 aluminium alloy for raw material: wherein Si 7.00%, Mg 0.30%, Cu≤0.20%, Mn≤0.10%, Zn≤0.10%, Fe≤0.20%, Ti≤0.20%, all the other impurity contents are each is not more than 0.05%, all the other are Al, composition is calculated by mass percentage, the A356 aluminium alloy processed is placed in the clean also preheating plumbago crucible of internal cleaning, be placed in SG2-7.5-12 type resistance furnace the fusing that heats up again, after A356 aluminium alloy all melts, when being warming up to 760 DEG C, with graphite rod powerful uniform stirring melt 1min, insulation 7min, with the dehydration ZnCl of 0.20% of bell jar press-in A356 aluminium alloy melt quality
2carry out refining, after leaving standstill 5min, skim, filter, pour into in steel mould, make metallographic specimen, processing 3 metal mold tensile test bars are often organized again by national Specification, room temperature tensile Mechanics Performance Testing is carried out on WE-10 type fluid pressure type tensile testing machine, and rate of extension is 0.05mm/min, and corresponding mechanical property of often organizing all is averaged, now, the tensile strength through the A356 aluminium alloy of melting casting is 182.56MPa, and elongation is 1.09%.
Claims (6)
1. one kind can be improved the processing method of A356 aluminium alloy fine degenerate effect, it is characterized in that: to go bad A356 aluminium alloy for alterant with the Al-10Sr master alloy through water cooled copper mould art breading, the add-on of alterant is the 0.10%-0.50% of A356 aluminium alloy quality, the described Al-10Sr master alloy through water cooled copper mould art breading is in the step of melting Al-10Sr master alloy, thoroughly skimming and after thick particle filtration is removed by aluminium alloy high-temperature fibre filtering net, aluminium alloy poured into fast and obtains in water cooled copper mould.
2. a kind of processing method that can improve A356 aluminium alloy fine degenerate effect as claimed in claim 1, it is characterized in that: the described Al-10Sr master alloy through water cooled copper mould art breading go bad A356 aluminium alloy time, when add-on is 0.30% of A356 aluminium alloy melt quality, the Microstructure and properties of fine degenerate A356 aluminium alloy is best.
3. a kind of processing method that can improve A356 aluminium alloy fine degenerate effect as claimed in claim 1, it is characterized in that: the composition of described Al-10Sr master alloy calculates according to mass percent and is: Sr 9.00%-11.00%, Ti≤0.02%, Si≤0.12%, Fe≤0.06%, all the other impurity contents are each is not more than 0.05%, and surplus is Al.
4. a kind of processing method that can improve A356 aluminium alloy fine degenerate effect as claimed in claim 1, it is characterized in that: the composition of described A356 aluminium alloy calculates according to mass percent and is: Si 6.50%-7.50%, Mg 0.20%-0.40%, Cu≤0.20%, Mn≤0.10%, Zn≤0.10%, Fe≤0.20%, Ti≤0.20%, all the other impurity contents are each is not more than 0.05%, and all the other are Al.
5. a kind of processing method that can improve A356 aluminium alloy fine degenerate effect as claimed in claim 1, it is characterized in that the step of described melting Al-10Sr master alloy is specially: first carry out pre-treatment, after Al-10Sr intermediate alloy ingot is cut into the bulk be of moderate size, carry out polishing, polishing to be to remove the oxide skin on surface, carry out cleaning in ultrasonic oscillation device with acetone, dry, weigh, melting auxiliary means ZnO coating is brushed, coat-thickness 1.0mm-1.5mm is dry for standby in 200 DEG C of-300 DEG C of chamber type electric resistance furnaces in temperature; Next carries out melting Al-10Sr master alloy, Al-10Sr master alloy is placed in internal cleaning clean and be preheated to the plumbago crucible of 450 DEG C-550 DEG C, and be placed in SG2-7.5-12 type resistance furnace the fusing that heats up, after the recessed deliquescing of melt, be sprinkled into the special insulating covering agent of aluminium alloy on its surface, completely after fusing, when being warming up to 690 DEG C-740 DEG C, with graphite rod powerful uniform stirring melt 1min, insulation 4min-6min makes each element homogenizing, passes into CCl
6degasification, with the dehydration ZnCl of 0.20% of graphite bell jar press-in Al-10Sr intermediate alloy melt quality
2to plumbago crucible, move horizontally, carry out refining, until complete reaction, leave standstill 4min-6min, when being cooled to 680 DEG C-700 DEG C, thoroughly skim, and thick particle filtration is removed by aluminium alloy high-temperature fibre filtering net, poured into fast in water cooled copper mould by aluminium alloy, take out master alloy after cooling, any impurity of plumbago crucible inner bottom part all must not pour Al-10Sr master alloy upper surface into, in order to avoid pollution master alloy, this technique is called Al-10Sr master alloy alterant water cooled copper mould art breading.
6. a kind of processing method that can improve A356 aluminium alloy fine degenerate effect as claimed in claim 1, it is characterized in that described being specially for the go bad step of A356 aluminium alloy of alterant with the Al-10Sr master alloy through water cooled copper mould art breading: A356 aluminium alloy process is placed in internal cleaning totally also preheating plumbago crucible, be placed in SG2-7.5-12 type resistance furnace the fusing that heats up, after A356 aluminium alloy all melts, when being warming up to 740 DEG C-780 DEG C, with graphite rod powerful uniform stirring melt 1min, insulation 6min-8min makes each element homogenizing, with the ZnCl of 0.20% dehydration of graphite bell jar press-in A356 aluminium alloy melt quality
2carry out refining, leave standstill 4min-6min, skim, the Al-10Sr master alloy alterant of 0.10%-0.50% through water cooled copper mould art breading of A356 aluminium alloy melt quality is added in melt, insulation 5min makes each element homogenizing, strong stirring, degasification, refining, leave standstill, be cooled to 730 DEG C, skim, filter, pour into respectively in steel mould, make metallographic specimen.
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