CN103924132B - A kind of preparation method of high corrosion-resistance wear-resistance engine cylinder cover aluminium alloy extrusions - Google Patents
A kind of preparation method of high corrosion-resistance wear-resistance engine cylinder cover aluminium alloy extrusions Download PDFInfo
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Abstract
The invention discloses a kind of preparation method of high corrosion-resistance wear-resistance engine cylinder cover aluminium alloy extrusions, is this aluminium alloy extrusions elementary composition by following mass percent: Si 9.4-10.8, Cu 0.7-1.4, Mg 0.4-0.8, Fe 0.15-0.25, Cr 0.3-0.6, Mn 0.05-0.1, Zn 0.02-0.04, Ni 0.01-0.02, As 0.03-0.05, Sn 0.025-0.045, Cd 0.02-0.03, Hf 0.015-0.025, B 0.005-0.01, Ce 0.02-0.04, Yb 0.01-0.03, surplus is Al.Aluminium alloy extrusions excellent combination property prepared by the inventive method, hot strength is high, can long term operation at 250-300 DEG C of temperature, and has excellent erosion resistance and wear resistance, has a extensive future.
Description
Technical field
The present invention relates to a kind of preparation method of high corrosion-resistance wear-resistance engine cylinder cover aluminium alloy extrusions, belong to aluminum alloy materials processing technique field.
Background technology
Engine is the heart of automobile, and cylinder head is a strength member on engine, its complex structure, and camshaft directly contacts running with it, and aluminum alloy materials wear resistance will be got well, and the high temperature of resistance to about 240 DEG C is wanted on cylinder cap and cylinder body junction surface.Meanwhile, also to stand sulfur oxide and water vapour in oil inflame after product form the corrosion of dilute sulphuric acid, working conditions is severe.Therefore strict especially to the aluminum alloy materials performance requriements producing cylinder head, not only require that hot strength is high, good toughness, also require that there is excellent wear resistance and erosion resistance.
Summary of the invention
Object of the present invention is providing a kind of preparation method of high corrosion-resistance wear-resistance engine cylinder cover aluminium alloy extrusions.This aluminium alloy extrusions excellent combination property, hot strength is high, good toughness, has excellent wear resistance and erosion resistance.
For achieving the above object, the technical solution used in the present invention is as follows:
A preparation method for high corrosion-resistance wear-resistance engine cylinder cover aluminium alloy extrusions, comprises the following steps:
(1) by aluminium ingot, magnesium ingot, aluminium scrap drops into smelting furnace and carries out melting, smelting temperature 730-750 DEG C, until its melting down more than 80% time, drop into Al-Si, the master alloys such as Al-Cu, after its all fusing, adjustment temperature is to 740-760 DEG C, add the hexachloroethane of melt weight 0.2-0.3% and the Sodium tetrafluoroborate refining 15-20min of 0.15-0.25%, induction stirring 10-15min after refining, leave standstill 20-30min, then temperature is adjusted to 755-775 DEG C, add Al-Ti-B-Ce master alloy, insulation 5-10min, skim, sampling analysis, the weight percent of each elemental composition of strict control aluminium alloy solution meets the following requirements: Si9.4-10.8, Cu0.7-1.4, Mg0.4-0.8, Fe0.15-0.25, Cr0.3-0.6, Mn0.05-0.1, Zn0.02-0.04, Ni0.01-0.02, As0.03-0.05, Sn0.025-0.045, Cd0.02-0.03, Hf0.015-0.025, B0.005-0.01, Ce0.02-0.04, Yb0.01-0.03, surplus is Al,
(2) adopt semicontinuous direct water-cooling castmethod to cast, casting temp is 720-740 DEG C, casting speed 70-90mm/min, cooling water pressure 0.15-0.25MPa, and cooling water flow is 1600-1800L/min;
(3) Homogenization Treatments is carried out to aluminium alloy cast ingot: be first warming up to 350-400 DEG C with 150-200 DEG C/h, insulation 3-6h, 160-220 DEG C is cooled to again with 80-120 DEG C/h, insulation 1-2h, then 420-460 DEG C is warming up to 100-150 DEG C/h, insulation 4-8h, then strong wind cooling is to 220-250 DEG C, insulation 2-3h, 480-510 DEG C is warming up to again with 120-160 DEG C/h, insulation 5-10h, then water smoke is cooled to 150-200 DEG C, insulation 1-2h, 400-450 DEG C is warming up to again with 100-150 DEG C/h, insulation 4-6h, then 140-180 DEG C is cooled to 120-160 DEG C/h, insulation 1-2h, air cooling is to room temperature,
(4) ingot casting after above-mentioned Homogenization Treatments is heated to 465-495 DEG C, then put into the mould extrusion machine extrusion molding being preheated to 470-500 DEG C, extruding rate is 10-15m/min, and mold clearing temperature is 510-530 DEG C;
(5) the aluminium alloy extrusions water smoke of above-mentioned extrusion molding is cooled to 200-250 DEG C, then be warming up to 450-490 DEG C with 80-120 DEG C/h, insulation 3-5h, then be cooled to 240-280 DEG C/h with 100-150 DEG C/h, insulation 2-3h, then puts into 0-5 DEG C of icy salt solution and is cooled to less than 50 DEG C;
(6) ageing treatment is carried out to aluminium alloy extrusions: be first warming up to 90-110 DEG C with 45-55 DEG C/h, insulation 10-15h, 190-210 DEG C is warming up to again with 50-60 DEG C/h, insulation 5-10h, 65-75 DEG C is cooled to again with 60-70 DEG C/h, insulation 15-20h, air cooling is to room temperature, then 80-90 DEG C is warming up to 40-50 DEG C/h, insulation 12-16h, air cooling is to room temperature, then 150-170 DEG C is warming up to 75-85 DEG C/h, insulation 8-12h, air cooling is to room temperature, then 175-195 DEG C is warming up to 80-90 DEG C/h, insulation 5-10h, 85-95 DEG C is cooled to again with 40-50 DEG C/h, insulation 10-15h, air cooling is to room temperature.
Beneficial effect of the present invention:
The content of Reasonable adjustment Si element of the present invention, the suitable content improving Cu, Mg element, by solution strengthening and the second-phase strength of aluminum substrate, the intensity of alloy is improved, and high-temperature behavior is improved, and adds Ce, Yb rare earth element of trace simultaneously, can crystal grain thinning, improve as-cast structure, also can improve corrosion resistance nature, make aluminium alloy extrusions more durable in use.Aluminium alloy extrusions excellent combination property prepared by the inventive method, hot strength is high, can long term operation at 250-300 DEG C of temperature, and has excellent erosion resistance and wear resistance, has a extensive future.
Embodiment
A preparation method for high corrosion-resistance wear-resistance engine cylinder cover aluminium alloy extrusions, comprises the following steps:
(1) by aluminium ingot, magnesium ingot, aluminium scrap drops into smelting furnace and carries out melting, smelting temperature 740 DEG C, until its melting down more than 80% time, drop into Al-Si, the master alloys such as Al-Cu, after its all fusing, adjustment temperature to 750 DEG C, add the hexachloroethane of melt weight 0.2% and the Sodium tetrafluoroborate refining 20min of 0.2%, induction stirring 15min after refining, leave standstill 30min, then temperature to 765 DEG C is adjusted, add Al-Ti-B-Ce master alloy, insulation 7min, skim, sampling analysis, the weight percent of each elemental composition of strict control aluminium alloy solution meets the following requirements: Si9.4-10.8, Cu0.7-1.4, Mg0.4-0.8, Fe0.15-0.25, Cr0.3-0.6, Mn0.05-0.1, Zn0.02-0.04, Ni0.01-0.02, As0.03-0.05, Sn0.025-0.045, Cd0.02-0.03, Hf0.015-0.025, B0.005-0.01, Ce0.02-0.04, Yb0.01-0.03, surplus is Al,
(2) adopt semicontinuous direct water-cooling castmethod to cast, casting temp is 730 DEG C, casting speed 80mm/min, cooling water pressure 0.2MPa, and cooling water flow is 1700L/min;
(3) Homogenization Treatments is carried out to aluminium alloy cast ingot: be first warming up to 360 DEG C with 180 DEG C/h, insulation 5h, then be cooled to 180 DEG C with 100 DEG C/h, insulation 1h, is then warming up to 460 DEG C with 150 DEG C/h, insulation 4h, then strong wind cooling to 240 DEG C, insulation 2h, then be warming up to 510 DEG C with 140 DEG C/h, insulation 6h, then water smoke is cooled to 200 DEG C, insulation 2h, be warming up to 440 DEG C with 120 DEG C/h again, insulation 4h, is then cooled to 150 DEG C with 150 DEG C/h, insulation 1h, air cooling is to room temperature;
(4) ingot casting after above-mentioned Homogenization Treatments is heated to 485 DEG C, then put into the mould extrusion machine extrusion molding being preheated to 500 DEG C, extruding rate is 12m/min, and mold clearing temperature is 520 DEG C;
(5) the aluminium alloy extrusions water smoke of above-mentioned extrusion molding is cooled to 230 DEG C, is then warming up to 470 DEG C with 100 DEG C/h, insulation 4h, then be cooled to 260 DEG C/h with 120 DEG C/h, insulation 2h, then puts into 2 DEG C of icy salt solutions and is cooled to less than 50 DEG C;
(6) ageing treatment is carried out to aluminium alloy extrusions: be first warming up to 105 DEG C with 50 DEG C/h, insulation 12h, then be warming up to 210 DEG C with 60 DEG C/h, insulation 5h, then be cooled to 70 DEG C with 70 DEG C/h, insulation 15h, air cooling, to room temperature, is then warming up to 90 DEG C with 45 DEG C/h, insulation 12h, air cooling, to room temperature, is then warming up to 160 DEG C with 80 DEG C/h, insulation 10h, air cooling, to room temperature, is then warming up to 180 DEG C with 90 DEG C/h, insulation 7h, be cooled to 95 DEG C with 45 DEG C/h again, insulation 10h, air cooling is to room temperature.
Through inspection, above-mentioned obtained aluminium alloy extrusions chemical composition is: Si10.26%, Cu1.25%, Mg0.72%, Fe0.19%, Cr0.48%, Mn0.084%, Zn0.036%, Ni0.014%, As0.048%, Sn0.037%, Cd0.023%, Hf0.022%, B0.0064%, Ce0.039%, Yb0.021%, and surplus is Al; The mechanical property of this aluminium alloy extrusions 300 DEG C time is: tensile strength 284MPa, yield strength 208MPa, elongation 10.7%.
Claims (1)
1. a preparation method for high corrosion-resistance wear-resistance engine cylinder cover aluminium alloy extrusions, is characterized in that comprising the following steps:
(1) by aluminium ingot, magnesium ingot, aluminium scrap drops into smelting furnace and carries out melting, smelting temperature 730-750 DEG C, until its melting down more than 80% time, drop into Al-Si, Al-Cu master alloy, after its all fusing, adjustment temperature is to 740-760 DEG C, add the hexachloroethane of melt weight 0.2-0.3% and the Sodium tetrafluoroborate refining 15-20min of 0.15-0.25%, induction stirring 10-15min after refining, leave standstill 20-30min, then temperature is adjusted to 755-775 DEG C, add Al-Ti-B-Ce master alloy, insulation 5-10min, skim, sampling analysis, the weight percent of each elemental composition of strict control aluminium alloy solution meets the following requirements: Si9.4-10.8, Cu0.7-1.4, Mg0.4-0.8, Fe0.15-0.25, Cr0.3-0.6, Mn0.05-0.1, Zn0.02-0.04, Ni0.01-0.02, As0.03-0.05, Sn0.025-0.045, Cd0.02-0.03, Hf0.015-0.025, B0.005-0.01, Ce0.02-0.04, Yb0.01-0.03, surplus is Al,
(2) adopt semicontinuous direct water-cooling castmethod to cast, casting temp is 720-740 DEG C, casting speed 70-90mm/min, cooling water pressure 0.15-0.25MPa, and cooling water flow is 1600-1800L/min;
(3) Homogenization Treatments is carried out to aluminium alloy cast ingot: be first warming up to 350-400 DEG C with 150-200 DEG C/h, insulation 3-6h, 160-220 DEG C is cooled to again with 80-120 DEG C/h, insulation 1-2h, then 420-460 DEG C is warming up to 100-150 DEG C/h, insulation 4-8h, then strong wind cooling is to 220-250 DEG C, insulation 2-3h, 480-510 DEG C is warming up to again with 120-160 DEG C/h, insulation 5-10h, then water smoke is cooled to 150-200 DEG C, insulation 1-2h, 400-450 DEG C is warming up to again with 100-150 DEG C/h, insulation 4-6h, then 140-180 DEG C is cooled to 120-160 DEG C/h, insulation 1-2h, air cooling is to room temperature,
(4) ingot casting after above-mentioned Homogenization Treatments is heated to 465-495 DEG C, then put into the mould extrusion machine extrusion molding being preheated to 470-500 DEG C, extruding rate is 10-15m/min, and mold clearing temperature is 510-530 DEG C;
(5) the aluminium alloy extrusions water smoke of above-mentioned extrusion molding is cooled to 200-250 DEG C, then be warming up to 450-490 DEG C with 80-120 DEG C/h, insulation 3-5h, then be cooled to 240-280 DEG C/h with 100-150 DEG C/h, insulation 2-3h, then puts into 0-5 DEG C of icy salt solution and is cooled to less than 50 DEG C;
(6) ageing treatment is carried out to aluminium alloy extrusions: be first warming up to 90-110 DEG C with 45-55 DEG C/h, insulation 10-15h, 190-210 DEG C is warming up to again with 50-60 DEG C/h, insulation 5-10h, 65-75 DEG C is cooled to again with 60-70 DEG C/h, insulation 15-20h, air cooling is to room temperature, then 80-90 DEG C is warming up to 40-50 DEG C/h, insulation 12-16h, air cooling is to room temperature, then 150-170 DEG C is warming up to 75-85 DEG C/h, insulation 8-12h, air cooling is to room temperature, then 175-195 DEG C is warming up to 80-90 DEG C/h, insulation 5-10h, 85-95 DEG C is cooled to again with 40-50 DEG C/h, insulation 10-15h, air cooling is to room temperature.
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