CN111575560A - Al-Mg-Si alloy for forging and preparation method thereof - Google Patents
Al-Mg-Si alloy for forging and preparation method thereof Download PDFInfo
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- CN111575560A CN111575560A CN202010674738.1A CN202010674738A CN111575560A CN 111575560 A CN111575560 A CN 111575560A CN 202010674738 A CN202010674738 A CN 202010674738A CN 111575560 A CN111575560 A CN 111575560A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/05—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
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Abstract
The invention belongs to the field of preparation of wrought aluminum alloy materials, and particularly relates to an Al-Mg-Si alloy for forging and a preparation method thereof, wherein the Al-Mg-Si alloy comprises the following elements, silicon, 0.75-0.85 in percentage by mass; iron is less than or equal to 0.25; 0.06-0.1 of copper; 0.75-0.85 of magnesium; 0.6-0.64 of manganese; 0.01-0.03% of chromium; zinc is less than or equal to 0.05; titanium: 0.01-0.03; the balance being aluminum. The invention has excellent extrudability, small extrusion resistance and long service life of the die; the performance of T61 after extrusion is as follows: the tensile strength is more than or equal to 310MPa, the yield is more than or equal to 250-300MPa, the elongation is more than or equal to 17 percent, and the coarse crystal layer is less than or equal to 1mm, so that the subsequent forging processing is facilitated; performance requirements for T6 after forging: the tensile strength is more than or equal to 390Mpa, the yield is more than or equal to 360Mpa, and the elongation is more than or equal to 6%; the casting performance is excellent, the universality is strong, and the method can be consistent with the existing 6082 smelting process.
Description
Technical Field
The invention belongs to the field of preparation of wrought aluminum alloy materials, and particularly relates to an Al-Mg-Si alloy for forging and a preparation method thereof.
Background
With the requirements on energy conservation, environmental protection, light weight and high maneuverability of the automobile, the light weight of the automobile is developed rapidly. The aluminum alloy has the characteristics of moderate strength, light weight, easy forming and the like, and is suitable for the light weight design of automobiles. Due to the consideration of strong plasticity and safety, the connecting rod of the automobile chassis needs to adopt 6082 aluminum alloy to meet the following performance requirements: performance requirements for T61 prior to forging: tensile strength is more than or equal to 310MPa, yield is more than or equal to 250-300MPa, elongation is more than or equal to 17%, and the thickness of the coarse crystal layer is less than or equal to 1 mm; performance requirements for T6 after forging: tensile strength is more than or equal to 390Mpa, yield is more than or equal to 360Mpa, and elongation is more than or equal to 6%. At present, the common 6082 alloy can not meet the requirements, and a new Al-Mg-Si alloy needs to be invented to meet the application.
Disclosure of Invention
The invention aims to solve the problems and provides an Al-Mg-Si alloy for forging, which can meet the requirements of strong plasticity and safety.
According to the technical scheme of the invention, the Al-Mg-Si alloy for forging comprises the following elements, by mass, 0.75-0.85 of silicon; iron is less than or equal to 0.25; 0.06-0.1 of copper; 0.75-0.85 of magnesium; 0.6-0.64 of manganese; 0.01-0.03% of chromium; zinc is less than or equal to 0.05; titanium: 0.01-0.03; the balance being aluminum.
In another aspect of the present invention, there is provided a method of preparing an Al-Mg-Si alloy for forging, comprising the steps of,
(1) according to the component proportion of claim 1, except magnesium element, the materials are charged into a furnace for smelting;
(2) adding magnesium element into the smelting furnace according to the component proportion, continuously smelting after mechanical stirring and electromagnetic stirring, and simultaneously slagging off;
(3) refining and simultaneously slagging off;
(4) casting, namely feeding titanium boron wires on line, performing Hycast on-line two-stage degassing and deslagging, and performing Hycast low-pressure vacuum casting;
(5) homogenizing at 565 deg.C for 6 hr;
(6) and (4) extruding, and adopting on-line spray cooling.
Further, the smelting temperature in the step (1) is 730-780 ℃; the refining temperature in the step (3) is 760-780 ℃, and the time is 30-35 min; the tapping temperature in the step (4) is 765-780 ℃; the extrusion outlet temperature in the step (6) is 520-560 ℃.
The invention has the beneficial effects that:
1) the extrusion property is excellent, the extrusion resistance is small, and the service life of the die is long;
2) the performance of T61 after extrusion is as follows: the tensile strength is more than or equal to 310MPa, the yield is more than or equal to 250-300MPa, the elongation is more than or equal to 17 percent, and the coarse crystal layer is less than or equal to 1mm, so that the subsequent forging processing is facilitated;
3) performance requirements for T6 after forging: the tensile strength is more than or equal to 390Mpa, the yield is more than or equal to 360Mpa, and the elongation is more than or equal to 6%;
4) the casting performance is excellent, the universality is strong, and the method can be consistent with the existing 6082 smelting process.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example one
An Al-Mg-Si alloy for forging, which comprises the following elements, by mass, 0.841; 0.165 parts of iron; copper 0.0961; 0.839 parts of magnesium; 0.638 parts of manganese; 0.004 of zinc; 0.0285 of chromium; titanium 0.0291; the balance being aluminum.
The preparation method comprises the following steps:
(1) according to the proportion of the components, except magnesium, preparing materials, charging into a furnace, and smelting at 730-780 ℃;
(2) adding magnesium element into the smelting furnace according to the component proportion, mechanically stirring for 30min, electromagnetically stirring for 30min, continuously smelting, and simultaneously slagging off;
(3) refining at 760-780 ℃ for 30-35min, and simultaneously slagging off;
(4) casting: discharging at 765-780 ℃, feeding titanium-boron wires on line, degassing and deslagging by Hycast on line at two stages, and casting at 80mm/min by Hycast low-pressure vacuum casting;
(5) homogenizing at 565 deg.C for 6 hr;
(6) and (4) extruding, wherein online spray cooling is adopted, and the temperature of an extrusion outlet is 520-560 ℃.
Example two
An Al-Mg-Si alloy for forging, which comprises the following elements, by mass, 0.795 of silicon; 0.155 of iron; 0.0772 parts of copper; magnesium 0.801; 0.611 of manganese; 0.005 of zinc; 0.0165 parts of chromium; 0.0232 parts of titanium; the balance being aluminum. The preparation method is the same as the first embodiment.
EXAMPLE III
An Al-Mg-Si alloy for forging, the composition of which contains the following elements, silicon 0.803; 0.181 parts of iron; 0.0802 of copper; magnesium 0.792; 0.623 parts of manganese; 0.005 of zinc; 0.0206 chromium; 0.0211 parts of titanium; the balance being aluminum. The preparation method is the same as the first embodiment.
Example four
An Al-Mg-Si alloy for forging, which comprises the following elements, silicon 0.769; 0.173 of iron; copper 0.0623; 0.764 of magnesium; 0.618 of manganese; 0.005 of zinc; 0.0117 of chromium; 0.0125 parts of titanium; the balance being aluminum. The preparation method is the same as the first embodiment.
EXAMPLE five
A6082 aluminum alloy for forging comprises the following elements, by mass, 1.08 of silicon; 0.14 parts of iron; 0.0027 parts of copper; 0.771 of magnesium; 0.528 parts of manganese; 0.0072 of zinc; 0.0666 parts of titanium; chromium 0.0602; the balance being aluminum. The preparation method is the same as the first embodiment.
The materials of examples one to five were tested, and the test results of the performance of the T61 alloy before material forging and the performance of the T6 alloy after material forging are shown in table 1 and table 2, respectively; the product in the test process is extruded and produced at 3600 tons, the meter weight of the bar is 6.68kg/m, and the main cylinder propulsion speed is 2.5mm under the condition that the extrusion ratio is 22; the outlet temperature is 535-550 ℃, and the temperature of the material after water cooling is below 35 ℃.
TABLE 1 Properties of the material T61 before forging
TABLE 2 post-forging T6 alloy properties
The test result proves that compared with the common 6082, the method can obviously improve the elongation before and after the alloy forging, reduce the thickness of the coarse crystal layer formed by the alloy, is beneficial to the subsequent forging processing of the material, and simultaneously, the strength of the forged material is not reduced. In conclusion, the Al-Mg-Si alloy is a good high-strength high-toughness novel aluminum alloy material suitable for automobile connecting rods.
Claims (3)
1. An Al-Mg-Si alloy for forging, characterized in that the composition thereof contains the following elements, silicon, by mass, 0.75-0.85; iron is less than or equal to 0.25; 0.06-0.1 of copper; 0.75-0.85 of magnesium; 0.6-0.64 of manganese; 0.01-0.03% of chromium; zinc is less than or equal to 0.05; titanium: 0.01-0.03; the balance being aluminum.
2. A preparation method of Al-Mg-Si alloy for forging is characterized by comprising the following steps,
(1) according to the component proportion of claim 1, except magnesium element, the materials are charged into a furnace for smelting;
(2) adding magnesium element into the smelting furnace according to the component proportion, continuously smelting after mechanical stirring and electromagnetic stirring, and simultaneously slagging off;
(3) refining and simultaneously slagging off;
(4) casting, namely feeding titanium boron wires on line, performing Hycast on-line two-stage degassing and deslagging, and performing Hycast low-pressure vacuum casting;
(5) homogenizing at 565 deg.C for 6 hr;
(6) and (4) extruding, and adopting on-line spray cooling.
3. The method for preparing Al-Mg-Si alloy for forging as set forth in claim 2, wherein the melting temperature in the step (1) is 730-780 ℃; the refining temperature in the step (3) is 760-780 ℃, and the time is 30-35 min; the tapping temperature in the step (4) is 765-780 ℃; the extrusion outlet temperature in the step (6) is 520-560 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113564433A (en) * | 2021-08-10 | 2021-10-29 | 江苏亚太航空科技有限公司 | Corrosion-resistant 6082 aluminum alloy material and casting process thereof |
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| CN101935788A (en) * | 2010-10-19 | 2011-01-05 | 上海友升铝业有限公司 | Aluminum-magnesium-silicon series aluminum alloy material with middle and high intensity |
| CN101935787A (en) * | 2010-10-19 | 2011-01-05 | 上海友升铝业有限公司 | Aluminum alloy material with high elongation rate |
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| CN113564433A (en) * | 2021-08-10 | 2021-10-29 | 江苏亚太航空科技有限公司 | Corrosion-resistant 6082 aluminum alloy material and casting process thereof |
| CN113564433B (en) * | 2021-08-10 | 2022-06-03 | 江苏亚太航空科技有限公司 | Corrosion-resistant 6082 aluminum alloy material and casting process thereof |
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