CN103343248B - Application of Al-Ti-C-Sr refiner in A356.2 aluminum knuckle of automobile - Google Patents
Application of Al-Ti-C-Sr refiner in A356.2 aluminum knuckle of automobile Download PDFInfo
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Abstract
The invention relates to application of an Al-Ti-C-Sr refiner in an A356.2 aluminum knuckle of an automobile. The technique comprises the following processing steps: (1) smelting and refining; and (2) carrying out low-pressure casting and thermal treatment. The defects of insufficient refining of crystal particles and low performance or the defects of high price of an Al-Ti-B refiner and the like when the traditional refiner and alterant are applied to the A356.2 automobile knuckle are mainly solved. Just intermediate alloy of the refiner Al-Ti-B is independently added, and then the Sr alterant is added in the international automotive industry at present. Thus, an A356.2 alloy structure is changed by using the Al-Ti-C-Sr refiner; the refiner not only can play a role of refining the crystal particles, but also can play a role of deterioration, and the roles of refining eutectic silicon and refining the structure; the strength, the plasticity and the corrosion resistance of the alloy can be improved.
Description
Technical field
The present invention relates to the application of Al-Ti-C-Sr fining agent at A356.2 alloy, particularly a kind of Al-Ti-C-Sr fining agent is in the application of A356.2 automobile aluminum products steering knuckle.
Background technology
Spindle is one of major part on steering axle of automobile, belongs to automotive security part.Automotive front load is born in the effect of steering knuckle, supports and drives front-wheel to make motor turning around stub rotates.Under motoring condition, it subjects changeable shock load, therefore, requires that it has very high intensity.Current international automobile industry, steering knuckle made by frequent employing A356 alloy, A356 belongs to hypoeutectic structure, Si mass content >=6%, so adopt various Metamorphism treatment, usual employing Sr goes bad, and in order to crystal grain thinning often adds Al-Ti or Al-Ti-B refiner, improves alloy structure and performance like this.And the TiAl3 phase of thick needle-like when adding Al-Ti, may be there is, and add Al-Ti-B refiner have TiB2 have assemble tendency, be unfavorable for the larger raising of alloy strength and plasticity like this, steering knuckle body tensile strength Rm=300Mpa, yield strength Rp0.2=228Mpa, unit elongation A=9% that traditional method is made.Can meet tensile strength Rm >=290Mpa, yield strength Rp0.2 >=220Mpa, the requirement of unit elongation A >=8% like this, but intensity not very high, and Al-Ti-B master alloy cost intensive.
Summary of the invention
The object of the present invention is to provide a kind of Al-Ti-C-Sr fining agent in the application of A356.2 automobile aluminum products steering knuckle, it mainly solves, and crystal grain thinning when existing fining agent and alterant are applied on A356.2 spindle is not enough, the low shortcoming of performance, or the shortcomings such as use Al-Ti-B refiner is expensive, and international automobile industry just adds separately fining agent Al-Ti-B master alloy at present, is then adding Sr alterant; The present invention adopts Al-Ti-C-Sr fining agent to change A356.2 alloy structure, and this fining agent not only can crystal grain thinning but also play metamorphism, makes Eutectic Silicon Refinement, the effect of structure refinement, can improve alloy strength, plasticity and erosion resistance.
The present invention solves the problems of the technologies described above adopted technical scheme.
Al-Ti-C-Sr fining agent, in an application for A356.2 automobile aluminum products steering knuckle, is characterized in that: it comprises the steps:
(1) melting and refining
Reasonable offer adopts fine aluminium, 99.99% pure magnesium, Al-Si24, Al-5Ti-C-0.8Sr master alloy of 99.99%, adopts crucible resistance melting, smelting temperature 750-760 DEG C, and be incubated 40 minutes at such a temperature, guarantee that material melts completely, subcontract in importing, after carry out adding refining agent N
2degasification, static 15 minutes, surveys hydrogen and makes density import>=2.62, concrete composition proportion according to the form below, import in holding furnace after test passes by aluminium liquid;
| Composition | Si | Fe | Cu | Mn | Mg | Zn | Ti | Sr | Al |
| % by weight | 6.5-7.5 | 0.15 | 0.10 | 0.10 | 0.30-0.45 | 0.10 | 0.10-0.25 | 0.012-0.025 | Surplus |
(2) low-pressure casting and thermal treatment
Low-pressure casting: temperature of aluminum liquid 710-720 DEG C; Patrix temperature 320 DEG C, counterdie temperature 260 DEG C; Pressure setting mode be one section pressure rising time 12S, pressure 190mbar, two sections pressure rising time 20S, pressure 300mbar, three sections pressure rising time 3S, pressure 550mbar, four sections pressure rising time 2S, pressure 650mbar, five sections pressure rising time 1S, pressure 700mbar, dwell time 3min, pressure 700mbar, solidifies 50S pressure release;
Thermal treatment process: quenching technology: be warmed up to 420 DEG C of heating-up time 2.5H from less than 200 DEG C, to 420 DEG C of insulation 2H, then is warmed up to 540 DEG C of heating-up time 0.5H from 420 DEG C, to 540 DEG C of insulation 6H, and rear water-cooled, quenching shift time 15S, water temperature 40 DEG C.Aging technique: aging temp 155 DEG C, aging time 6H.
Al-Ti-C-Sr fining agent is used to join A356.2 aluminum steering knuckle tensile strength Rm=317Mpa, yield strength Rp0.2=240Mpa, unit elongation A=10% in the present invention, steering knuckle higher-strength and plasticity requirements can be met, and there is high weather resistance and erosion resistance, the present invention can be made like this to be widely used in aluminum steering knuckle security part and produce.And provide one and improve alloy structure, improve the way of alloy strength and plasticity.
Accompanying drawing explanation
Fig. 1 is the as-cast condition metallographic structure figure during the present invention applies.
Fig. 2 is the as-heat-treated condition metallographic structure figure during the present invention applies.
Embodiment
The invention discloses the application of Al-Ti-C-Sr fining agent at A356.2 automobile aluminum products steering knuckle, particularly Al-Ti-C-Sr fining agent is in the effect of A356.2 alloy, and mainly it can improve alloy strength, plasticity and corrosion resistance nature effect.
The application of Al-Ti-C-Sr fining agent at A356.2 automobile aluminum products steering knuckle is introduced further below by way of an embodiment.The concrete technological process of production comprises the steps:
(1) melting and refining
Reasonable offer adopts fine aluminium, 99.99% pure magnesium, Al-Si24, Al-5Ti-C-0.8Sr master alloy of 99.99%, adopt crucible resistance melting, smelting temperature 759 DEG C, and be incubated 40 minutes at such a temperature, guarantee that material melts completely, subcontract in importing, temperature of aluminum liquid carries out adding refining agent and using N at 723 DEG C
2degasification, static 15 minutes, survey hydrogen density>=2.62, concrete composition proportion must meet shown in following table, is imported in holding furnace by aluminium liquid, can cast after test passes.
| Composition | Si | Fe | Cu | Mn | Mg | Zn | Ti | Sr | Al |
| Standard % | 6.5-7.5 | 0.15 | 0.10 | 0.10 | 0.30-0.45 | 0.10 | 0.10-0.25 | 0.012-0.02 | Surplus |
| Actual measurement % | 7.1 | 0.1 | 0.05 | 0.10 | 0.35 | 0.10 | 0.15 | 0.016 | Surplus |
(2) low-pressure casting and thermal treatment process
Low-pressure casting: temperature of aluminum liquid 716 DEG C; Patrix temperature 320 DEG C, counterdie temperature 260 DEG C; Pressure setting (one section pressure rising time 12S, pressure 190mbar, two sections pressure rising time 20S, pressure 300mbar, three sections pressure rising time 3S, pressure 550mbar, four sections pressure rising time 2S, pressure 650mbar, five sections pressure rising time 1S, pressure 700mbar, dwell time 3min, pressure 700mbar, solidifies 50S pressure release).
Thermal treatment process: quenching technology: be warmed up to 420 DEG C of heating-up time 2.5H from less than 200 DEG C, to 420 DEG C of insulation 2H, then is warmed up to 540 DEG C of heating-up time 0.5H from 420 DEG C, to 540 DEG C of insulation 6H, and rear water-cooled, quenching shift time 15S, water temperature 40 DEG C.Aging technique: aging temp 155 DEG C, aging time 6H.
Carry out quality examination control according to above-mentioned technique, metallographic structure, performance test detect.
Metallographic structure
From as-cast condition undertissue (Fig. 1): dendritic network is tiny, is evenly distributed, dendrite interval about 25 μm, Eutectic Silicon in Al-Si Cast Alloys is tiny of point-like, is evenly distributed.Refinement is described and goes bad.(Fig. 2) is organized: all do not occur that remelt eutectic spheroid, coarse-grain circle local are in fusiform and crystal boundary hair, triangle crystal boundary or along crystal boundary quenching crack phenomenon, non-burning or superheating phenomenon after thermal treatment.
Performance test
Room temperature tensile properties and Brinell hardness test result see the following form
Above-mentioned every test result all meets product requirement, and the thermal treatment process that Al-Ti-C-Sr fining agent changes A356.2 alloy structure and the present invention adopts can ensure that product meets use properties requirement.
Superiority of the present invention and positive effect are:
1, adopt Al-Ti-C-Sr fining agent to change A356.2 alloy structure, in this fining agent, equally distributed TiAl3 also effectively prevents the loose aggregate of TiC compound, not only improves the thinning effect of fining agent, dendrite interval about 25 μm.And greatly improve alloy casting formability, effectively improve the plasticity of alloy simultaneously; This fining agent contains Sr element can play metamorphism, makes Eutectic Silicon Refinement, has the effect improving intensity and plasticity.
2, the alloy after the process of Al-Ti-C-Sr fining agent is evenly tiny, impels to a great extent in alloying element Dispersed precipitate aluminum substrate, is conducive to like this improving alloy strength.
3, Al-Ti-C-Sr fining agent joins in A356.2 material and makes steering knuckle, through Overheating Treatment (i.e. quenching technology: be warmed up to 420 DEG C of heating-up time 2.5H from less than 200 DEG C, to 420 DEG C of insulation 2H, 540 DEG C of heating-up time 0.5H are warmed up to again from 420 DEG C, to 540 DEG C of insulation 6H, rear water-cooled, quenching shift time 15S, water temperature 40 DEG C.Aging technique: aging temp 155 DEG C, aging time 6H.) its intensity and plasticity all can reach the technical requirements of steering knuckle afterwards.
In sum, be only preferred embodiment of the present invention, be not used for limiting practical range of the present invention, namely all equivalences done according to the content of the present patent application the scope of the claims change and modify, and all should be technology category of the present invention.
Claims (1)
1. Al-Ti-C-Sr fining agent is in an application for A356.2 automobile aluminum products steering knuckle, it is characterized in that: it comprises the steps:
(1) melting and refining
Reasonable offer adopts fine aluminium, 99.99% pure magnesium, Al-Si24, Al-5Ti-C-0.8Sr master alloy of 99.99%, adopts crucible resistance melting, smelting temperature 750-760 DEG C, and be incubated 40 minutes at such a temperature, guarantee that material melts completely, subcontract in importing, after carry out adding refining agent N
2degasification, static 15 minutes, surveys hydrogen and makes density import>=2.62, concrete composition proportion according to the form below, import in holding furnace after test passes by aluminium liquid;
(2) low-pressure casting and thermal treatment
Low-pressure casting: temperature of aluminum liquid 710-720 DEG C; Patrix temperature 320 DEG C, counterdie temperature 260 DEG C; Pressure setting mode be one section pressure rising time 12s, pressure 190mbar, two sections pressure rising time 20s, pressure 300mbar, three sections pressure rising time 3s, pressure 550mbar, four sections pressure rising time 2s, pressure 650mbar, five sections pressure rising time 1s, pressure 700mbar, dwell time 3min, pressure 700mbar, solidifies 50s pressure release;
Thermal treatment process: quenching technology: be warmed up to 420 DEG C of heating-up time 2.5h from less than 200 DEG C, to 420 DEG C of insulation 2h, then is warmed up to 540 DEG C of heating-up time 0.5h from 420 DEG C, to 540 DEG C of insulation 6h, and rear water-cooled, quenching shift time 15s, water temperature 40 DEG C; Aging technique: aging temp 155 DEG C, aging time 6h.
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| CN103820684A (en) * | 2014-02-19 | 2014-05-28 | 福州钜立机动车配件有限公司 | Recasting aluminum alloy material for air intake rocker arm |
| CN109860560A (en) * | 2019-02-12 | 2019-06-07 | 上海交通大学 | Aluminium-air cell aluminium anodes electrode material and preparation method thereof |
| CN111842800A (en) * | 2020-07-17 | 2020-10-30 | 宁波拓普汽车电子有限公司 | Method for casting aluminum alloy knuckle by aluminum alloy ingot |
| CN112775414A (en) * | 2021-01-11 | 2021-05-11 | 山东一立动力科技股份有限公司 | Low-pressure casting method of aluminum alloy fan blade |
| CN113080684A (en) * | 2021-03-31 | 2021-07-09 | 浙江众恒铝业有限公司 | Multi-color non-stick pan and production process thereof |
| CN113403558A (en) * | 2021-06-22 | 2021-09-17 | 上海嘉朗实业南通智能科技有限公司 | Heat treatment process for casting aluminum-silicon alloy |
| CN113957302A (en) * | 2021-09-06 | 2022-01-21 | 苏州慧驰轻合金精密成型科技有限公司 | Non-heat-treatment-strengthened high-toughness die-casting aluminum alloy material for new energy automobile battery box |
| CN114700478A (en) * | 2022-03-25 | 2022-07-05 | 东风汽车集团股份有限公司 | Casting system and casting process of high-performance aluminum alloy steering knuckle |
| CN115418513B (en) * | 2022-09-23 | 2023-09-29 | 北京航空航天大学云南创新研究院 | High-strength heat-resistant cast aluminum-silicon alloy and heat treatment method thereof |
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| CN101205581A (en) * | 2007-11-21 | 2008-06-25 | 葛炳灶 | Secondary aluminum prepared by using Al-Ti-C-Sr alloy refiner and preparation thereof |
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| CN101205581A (en) * | 2007-11-21 | 2008-06-25 | 葛炳灶 | Secondary aluminum prepared by using Al-Ti-C-Sr alloy refiner and preparation thereof |
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| Al-Ti-C-Sr中间合金对车轮铸造用A356合金细化与变质双重作用的效果研究;李宏等;《科技与企业》;20120531(第10期);第299页 * |
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