CN105063390A - Hypoeutectic aluminum-silicon alloy melt compound treatment method - Google Patents
Hypoeutectic aluminum-silicon alloy melt compound treatment method Download PDFInfo
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- CN105063390A CN105063390A CN201510418655.5A CN201510418655A CN105063390A CN 105063390 A CN105063390 A CN 105063390A CN 201510418655 A CN201510418655 A CN 201510418655A CN 105063390 A CN105063390 A CN 105063390A
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Abstract
The invention relates to a melt compound treatment method of a hypoeutectic aluminum-silicon alloy. The hypoeutectic aluminum-silicon alloy contains 6wt%-10wt% of silicon, 0wt%-1.0wt% of magnesium and copper and the balance aluminum. A melt treatment process with compound modification and thermal rate treatment is applied. The melt compound treatment method includes the steps of firstly overheating 60%-80% of total mass of hypoeutectic aluminum-silicon alloy to 830 DEG C-990 DEG C; keeping warm for 10-20min; adding the rest of alloy into an alloy liquid for chilling; sharp decreasing the melt temperature to 740 DEG C-780 DEG C; then adding yttrium which accounts for 0%-1.0% of total mass of the alloy; performing uniform stirring to obtain a mixture; pouring the mixture in a mould after still standing to obtain the alloy. The melt compound treatment process is applied so that mechanical properties of the hypoeutectic aluminum-silicon alloy can be improved. By means of the method, the production cost is low, and operation is easy. Compared with common casting methods, the method can achieve remarkable enhancing effects on the hypoeutectic aluminum-silicon alloy.
Description
Technical field
The present invention relates to a kind of hypoeutectic aluminum-silicon alloy melt compounding method, belong to metallic substance and metallurgical technology field.
Background technology
Hypoeutectic aluminum-silicon alloy is Al-Si alloy conventional in industry, and its microstructure is made up of the α-Al sosoloid of toughness and al-si eutectic tissue, has good mechanical property, formability.Hypoeutectic aluminum-silicon alloy is applied in automobile, machinery, space flight and war industry widely.
But in hypoeutectic aluminum-silicon alloy, Eutectic Silicon in Al-Si Cast Alloys is thick needle-like, seriously isolates matrix, makes the degradation such as its mechanics and can not meet practical application request.Therefore, take effective means to improve alloy grain morphology and distribution be necessary.The universal method changing morphology of eutectic silicon adds alterant to carry out Metamorphism treatment to it.In hypoeutectic aluminum-silicon alloy, conventional alterant has sodium, strontium, rare earth etc., and need the strict add-on and the feed postition that control alterant, in addition, alterant has certain rotten paracme, needs to control well the time added.
Alloy melt is solid-state by Liquid-solid Transition by liquid conversion, therefore, for the cast alloy materials obtained by liquid metal solidification, Liquid Structure state during alloy graining has direct and conclusive impact to the forming core of crystal grain and process of growth and final solidified structure and performance.So, alloy structure can be improved, improve performance by the thermal rate treatment structural state controlled when alloy melt solidifies.Document [Wang Changqin, Zhao Yutao, Zhang Songli, Chen Gang. rare-earth yttrium is on the impact of A356 alloy microscopic structure and tensile property. mechanical engineering material, 2010 (34): 13-16] in report yttrium and have good metamorphism to aluminum-silicon alloy.Being combined with Metamorphism treatment by thermal rate treatment to make the tissue of hypoeutectic aluminum-silicon alloy be further improved, and the performances such as mechanics also improve further, make it have and apply widely.
Summary of the invention
In order to solve the problems such as mechanical properties decrease that in hypoeutectic aluminum-silicon alloy, coarse grains causes, the invention provides one improves alloy microstructure, improves the hypoeutectic aluminum-silicon alloy melt compounding method of mechanical property.Melt compounding method is thermal rate treatment and yttrium Metamorphism treatment phase compound.Melt thermal rate treatment refers to according to alloy melt structure variation with temperature rule, adopts the mode of Quench to make melt have some structure, thus improves as-cast structure and the structure of alloy, and put forward heavy alloyed mechanical property.
The present invention have studied a kind of hypoeutectic aluminum-silicon alloy melt compounding method, comprises the following steps:
The present invention's hypoeutectic aluminum-silicon alloy used composition consists of: silicon 6wt.% ~ 12%wt.%, magnesium, copper 0wt.% ~ 1.0wt.%, and all the other are aluminium.
(1) 830 DEG C ~ 990 DEG C are superheated to by 60% ~ 80% of hypoeutectic aluminum-silicon alloy total mass, insulation 10 ~ 20min;
(2) the congruent alloy of residue being preheated to 50 DEG C ~ 200 DEG C is joined in the aluminium alloy of preset temperature, carry out Quench, make melt temperature prompt drop to 740 DEG C ~ 780 DEG C;
(3) add the yttrium accounting for alloy total mass 0.1% ~ 1.0% after, stir, pour into mold after leaving standstill and get final product.
Described hypoeutectic aluminum-silicon alloy melt compounding method, re-uses after yttrium and aluminium are made 8wt.% ~ 15wt.% Al-Y alloy.
Described hypoeutectic aluminum-silicon alloy melt compounding method, is characterized in that first being superheated to 830 DEG C ~ 990 DEG C by 60% ~ 80% of hypoeutectic aluminum-silicon alloy total mass in step (1), insulation 10 ~ 20min.
Described hypoeutectic aluminum-silicon alloy melt compounding method, its temperature of superheat needs suitably adjustment according to alloying constituent difference.
The present invention selects hypoeutectic aluminum-silicon alloy to be parent, and the coarse grain for alloy have employed new melt compounding method.By varying with temperature the analysis of rule to hypoeutectic aluminum-silicon alloy melt structure, choose the processing parameters such as suitable melt overheat temperature, soaking time, Quench mode, by controlling the rotten melt state of yttrium, invent a kind of composite treatment process method, improve the structure and properties of hypoeutectic aluminum-silicon alloy.
The present invention adopts melt treatment that is rotten and thermal rate treatment compound, the Primary α-Al Phase in hypoeutectic aluminum-silicon alloy can be made to be reduced to 30 ~ 50 μm by 120 ~ 270 μm, Eutectic Silicon in Al-Si Cast Alloys changes the particulate state of several microns into by the needle-like of 15 ~ 25 μm, and the obvious passivation of corner angle, is evenly distributed.Its tensile strength, yield strength, hardness and elongation all obtain larger raising.
Embodiment
Embodiment 1
In resistance furnace, 890 DEG C are superheated to by 70% of the hypoeutectic aluminum-silicon alloy total amount of siliceous 9wt.%, magnesium 0.5wt.%, after insulation 20min, the alloy material that residue is preheated to 80 DEG C is added in melt, stir rapidly, melt temperature is made to be down to about 760 DEG C, leave standstill insulation 10min, casting metal type is shaped.
After thermal rate treatment, the tensile strength of this alloy brings up to 231MPa by 202MPa, and yield strength brings up to 119MPa by 106MPa, and hardness brings up to 89HB by 78HB, and elongation brings up to 4.18% by 2.41%.
Embodiment 2
In resistance furnace, 930 DEG C are superheated to by 60% of the hypoeutectic aluminum-silicon alloy total amount of siliceous 9wt.%, magnesium 0.5wt.%, after insulation 20min, the alloy material that residue is preheated to 100 DEG C is added in melt, stir rapidly, melt temperature is made to be down to about 760 DEG C, leave standstill insulation 10min, casting metal type is shaped.
After thermal rate treatment, the tensile strength of this alloy brings up to 243MPa by 202MPa, and yield strength brings up to 130MPa by 106MPa, and hardness brings up to 93HB by 78HB, and elongation brings up to 4.02% by 2.41%.
Embodiment 3
In resistance furnace, 930 DEG C are superheated to by 75% of the hypoeutectic aluminum-silicon alloy total amount of siliceous 9wt.%, magnesium 0.5wt.%, after insulation 20min, the alloy material that residue is preheated to 90 DEG C is added in melt, stir rapidly, melt temperature is made to be down to about 770 DEG C, add the yttrium accounting for total alloy amount 0.1% afterwards to stir, leave standstill insulation 10min, casting metal type is shaped.
After thermal rate treatment and yttrium Metamorphism treatment Combined Processing, the tensile strength of this alloy brings up to 251MPa by 202MPa, and yield strength brings up to 139MPa by 106MPa, and hardness brings up to 96HB by 78HB, and elongation brings up to 4.48% by 2.41%.
Embodiment 4
In resistance furnace, 930 DEG C are superheated to by 65% of the hypoeutectic aluminum-silicon alloy total amount of siliceous 9%wt.%, magnesium 0.5wt.%, after insulation 20min, the alloy material that residue is preheated to 100 DEG C is added in melt, stir rapidly, melt temperature is made to be down to about 770 DEG C, add the yttrium accounting for total alloy amount 0.2% afterwards and carry out Metamorphism treatment, leave standstill insulation 10min, casting metal type is shaped.
After thermal rate treatment and yttrium Metamorphism treatment Combined Processing, the tensile strength of this alloy brings up to 269MPa by 202MPa, and yield strength brings up to 148MPa by 106MPa, and hardness brings up to 102HB by 78HB, and elongation brings up to 4.79% by 2.41%.
Embodiment 5
In resistance furnace, 900 DEG C are superheated to by 75% of the hypoeutectic aluminum-silicon alloy total amount of siliceous 7%wt.%, magnesium 0.4wt.%, copper 0.2wt.%, after insulation 20min, the alloy material that residue is preheated to 90 DEG C is added in melt, stir rapidly, melt temperature is made to be down to about 750 DEG C, add the yttrium accounting for total alloy amount 0.2% afterwards and carry out Metamorphism treatment, leave standstill insulation 10min, casting metal type is shaped.
After thermal rate treatment and yttrium Metamorphism treatment Combined Processing, the tensile strength of this alloy brings up to 255MPa by 194MPa, and yield strength brings up to 137MPa by 101MPa, and hardness brings up to 94HB by 71HB, and elongation brings up to 4.23% by 2.41%.
Can be obtained by above-described embodiment, the hypoeutectic aluminum-silicon alloy after melt Combined Processing, its tensile strength, yield strength, hardness and elongation all significantly improve.Visible, after hypoeutectic aluminum-silicon alloy melt Combined Processing, the comprehensive mechanical property of alloy improves.
Claims (5)
1. a hypoeutectic aluminum-silicon alloy melt compounding method, is characterized in that comprising the following steps:
(1) 830 DEG C ~ 990 DEG C are first superheated to by 60% ~ 80% of hypoeutectic aluminum-silicon alloy total mass, insulation 10 ~ 20min;
(2) the residue hypoeutectic aluminum-silicon alloy being preheated to 50 DEG C ~ 200 DEG C is joined in overheated aluminium alloy, carry out Quench, make melt temperature prompt drop to 740 DEG C ~ 780 DEG C;
(3) add the yttrium accounting for alloy total mass 0.1% ~ 1.0% after, stir, pour into mold after leaving standstill and get final product;
Yttrium and aluminium re-use after making Al-Y alloy.
2. hypoeutectic aluminum-silicon alloy according to claim 1, it is characterized in that, composition consists of: silicon 6wt.% ~ 10%wt.%, magnesium, copper 0wt.% ~ 1.0wt.%, and all the other are aluminium.
3. hypoeutectic aluminum-silicon alloy melt compounding method according to claim 1, is characterized in that, Al-Y alloy is 8wt.% ~ 15wt.% containing yttrium amount.
4. hypoeutectic aluminum-silicon alloy melt compounding method according to claim 1, is characterized in that, be first superheated to 830 DEG C ~ 990 DEG C by 60% ~ 80% of hypoeutectic aluminum-silicon alloy total mass, insulation 10 ~ 20min.
5. hypoeutectic aluminum-silicon alloy melt compounding method according to claim 1, is characterized in that, hypoeutectic aluminum-silicon alloy melt temperature needs suitably adjustment according to alloying constituent difference.
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Cited By (3)
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| CN106011563A (en) * | 2016-05-23 | 2016-10-12 | 济南大学 | Hypo eutectic aluminum-magnesium alloy reinforcing method through melt compounding treatment |
| CN106048314A (en) * | 2016-07-06 | 2016-10-26 | 济南大学 | Compound treatment method for aluminum-manganese alloy melt |
| CN112941357A (en) * | 2021-01-11 | 2021-06-11 | 南昌大学 | Preparation method of graphene and rare earth composite reinforced aluminum alloy semi-solid slurry |
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| CN112941357A (en) * | 2021-01-11 | 2021-06-11 | 南昌大学 | Preparation method of graphene and rare earth composite reinforced aluminum alloy semi-solid slurry |
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Application publication date: 20151118 |