KR20090030871A - High strength al-alloy with good formability - Google Patents
High strength al-alloy with good formability Download PDFInfo
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- KR20090030871A KR20090030871A KR1020070096514A KR20070096514A KR20090030871A KR 20090030871 A KR20090030871 A KR 20090030871A KR 1020070096514 A KR1020070096514 A KR 1020070096514A KR 20070096514 A KR20070096514 A KR 20070096514A KR 20090030871 A KR20090030871 A KR 20090030871A
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본 발명은 압출 및 단조용 소재로 사용할 수 있는 성형성이 우수한 고강도 알루미늄 합금에 관한 것으로, 더 자세하게는 기계적 특성을 향상시키기 위해 개량 6082 알루미늄 합금의 Cu 함량을 증가시킴으로써 고용강화 효과 및 시효경화 효과를 향상시킴으로써 기계적 특성을 확보할 수 있는 성형성이 우수한 고강도 알루미늄 합금에 관한 것이다.The present invention relates to a high-strength aluminum alloy having excellent moldability that can be used as an extrusion and forging material, and more particularly, by increasing the Cu content of the improved 6082 aluminum alloy in order to improve mechanical properties. It is related with the high strength aluminum alloy excellent in moldability which can ensure mechanical characteristics by improving.
알루미늄은 철 다음으로 사용량이 많은 금속으로서, 가볍고 내식성과 가공성이 좋으며 전기 및 열 전도도가 높을 뿐만 아니라 Cu, Mg, Si, Zn, Mn, Ni 등의 원소를 첨가함으로써 다양한 종류의 고강도, 고내식성 합금으로 만들어 항공기, 가정용품, 건축, 차량, 기계, 전기 등 가정과 산업 전분야에 걸쳐 사용되고 있다.Aluminum is the second most used metal after iron, and it is light, has good corrosion resistance and processability, has high electrical and thermal conductivity, and adds various kinds of high strength and high corrosion resistance alloys by adding elements such as Cu, Mg, Si, Zn, Mn, and Ni. It is used throughout the home and industrial sectors such as aircraft, home appliances, construction, vehicles, machinery, and electricity.
알루미늄은 상기와 같은 주요 합금원소의 첨가에 따라 다음과 같이 분류되는바, 1000계열은 99.00wt% 이상의 알루미늄을 함유한 순수 알루미늄, 2000계열은 Al-Cu계 합금, 3000계열은 Al-Mn계 합금, 4000계열은 Al-Si계 합금, 5000계열은 Al-Mg계 합금, 6000계열은 Al-Mg-Si계 합금, 7000계열은 Al-Zn계 합금으로 분류, 표시하는 방법이 널리 사용되고 있다.Aluminum is classified as follows according to the addition of the main alloying elements as described above, 1000 series is pure aluminum containing more than 99.00wt% aluminum, 2000 series Al-Cu alloy, 3000 series Al-Mn alloy For example, the 4000 series are Al-Si alloys, the 5000 series Al-Mg alloys, the 6000 series Al-Mg-Si alloys, and the 7000 series Al-Zn alloys.
그 중 가장 경제적이고 활용도가 높은 열처리형 합금은 주합금 첨가원소가 Mg과 Si인 6000계열의 Al-Mg-Si계 합금이다. Among them, the most economical and versatile heat treatment alloy is Al-Mg-Si alloy of 6000 series, whose main alloying elements are Mg and Si.
상기 6000계열의 Al-Mg-Si계 합금은 압출성이 매우 우수하여 전 세계에서 생산되는 압출재의 80%이상이 6000계열 합금으로 사용되며, 표면처리성, 용접성, 기계가공성 및 고온 특성이 우수하여 자동차 부품, 도로, 교량용 소재, 거푸집, 커튼월, 섀시 등 건축용 소재 및 공업용 소재에 이용되고 있으며 그 수요는 증가하고 있는 추세이다. The Al-Mg-Si alloy of the 6000 series is very excellent in extrudability, 80% or more of the extruded material produced in the world is used as the 6000 series alloy, and excellent surface treatment, weldability, machinability and high temperature characteristics It is used for building materials such as automobile parts, roads, bridge materials, formwork, curtain walls, chassis, and industrial materials, and the demand is increasing.
또한, 6000계열의 Al-Mg-Si계 합금은 심한 가공에 견디며 복잡한 모양의 부품을 주조하는데 적합하고 용접성 및 내식성이 좋으며 시효경화성을 가지고 인성이 좋아 압출재로 널리 사용되고 있다.In addition, the 6000 series of Al-Mg-Si alloys are suitable for casting complicated parts, have good weldability and corrosion resistance, and have good hardening properties and toughness, and are widely used as extrusion materials.
그러나 기술이 발전함에 따라 각종 압출 제품들에 대한 높은 품질의 제품이 요구되고 있으며 제품 구조가 복잡해지면서 종래의 Al-Mg-Si계 알루미늄 합금은 과다한 Mg첨가에 따른 성형성 및 강성 저하 현상이 나타나게 되었다.However, as the technology develops, high quality products are required for various extruded products, and as the product structure becomes complicated, the conventional Al-Mg-Si-based aluminum alloy exhibits deterioration in formability and rigidity due to excessive Mg addition. .
그리고, 자동차 부품과 같은 고품질 제품에 대한 압출성이 떨어질 뿐만 아니라 압출재를 절단한 후 최종 제품으로 가공시 물성 저하에 따른 크랙 발생등의 의한 불량률 증가에 따른 부품가가 높아지는 문제가 있다.In addition, there is a problem that the parts price due to the increase in the defective rate, such as crack generation due to the reduction in physical properties when processing the final product after cutting the extrusion material as well as the extrusion property for high-quality products, such as automotive parts are inferior.
본 발명은 종래의 Al-Mg-Si계 알루미늄 합금이 가지고 있는 제반 문제점들을 해결하기 위하여 창안된 것으로, 개량 6082 알루미늄 합금의 기계적 특성을 향상시키는 동시에 압출성을 향상시킬 수 있는 성형성이 우수한 고강도 알루미늄 합금을 제공하는 것이다.The present invention was devised to solve all the problems of the conventional Al-Mg-Si-based aluminum alloy, and is a high strength aluminum having excellent moldability to improve the mechanical properties of the improved 6082 aluminum alloy and improve the extrudability. To provide an alloy.
본 발명의 성형성이 우수한 고강도 알루미늄 합금은 Al-Mg-Si계 합금에 있어서, Si 0.95~1.05wt%, Mg 0.5~0.6wt%, Mn 0.5~0.6wt%, Cu 0.2wt% 이하, Fe 0.15~0.25wt%, Cr 0.13~0.18wt%, Ti 0.03wt% 이하, Zn 0.05wt% 이하 및 기타 불가피한 성분 각 0.02wt% 이하이되 그 합이 0.10wt%이하, 그리고 잔부의 Al으로 조성된 것을 특징으로 한다.High-strength aluminum alloy excellent in formability of the present invention, in the Al-Mg-Si-based alloy, Si 0.95 ~ 1.05wt%, Mg 0.5 ~ 0.6wt%, Mn 0.5 ~ 0.6wt%, Cu 0.2wt% or less, Fe 0.15 ~ 0.25wt%, Cr 0.13 ~ 0.18wt%, Ti 0.03wt% or less, Zn 0.05wt% or less and other unavoidable components each 0.02wt% or less, the sum is 0.10wt% or less, and the balance is composed of Al It is done.
본 발명은 개량 6082 알루미늄의 Cu 함량을 0.2wt%이하로 증가시킴으로써 Mg 첨가시와 유사한 고용강화 효과를 얻을 수 있으며 조직 내에서 Mg2Si 석출량을 증가시킴으로 인해 Mg2Si에 의한 시효경화를 증대시킬 수 있어 기계적 특성을 증가시킬 뿐만 아니라, Mg의 첨가와 비교하여 압출시 압력 감소 효과를 얻을 수 있으므로 종 래의 고강도 Al-Mg-Si계 알루미늄 합금보다 성형성이 우수한 고강도 알루미늄 합금을 얻을 수 있는 장점이 있다.In the present invention, by increasing the Cu content of the improved 6082 aluminum to 0.2wt% or less, a solid solution effect similar to that of Mg addition can be obtained, and the aging hardening by Mg 2 Si is increased due to the increase of Mg 2 Si precipitation in the structure. In addition to increasing the mechanical properties, it is possible to obtain a high-pressure aluminum alloy with excellent formability than conventional high-strength Al-Mg-Si-based aluminum alloy because it can obtain a pressure reduction effect during extrusion compared to the addition of Mg. There is an advantage.
본 발명의 상기 목적은 Cu의 함량을 증가시키는 것에 의해 달성된다.This object of the invention is achieved by increasing the content of Cu.
본 발명의 성형성이 우수한 고강도 알루미늄 합금은 자동차 부품에 적합한 강도를 갖도록 한 Al-Mg-Si계 합금으로서, Si 0.95∼1.05wt%, Mg 0.5∼0.6wt%, Mn 0.5∼0.6wt%, Fe 0.15∼0.25wt%, Cr 0.13∼0.18wt%, Cu 0.05wt%이하, Ti 0.03wt% 이하, Zn 0.05wt% 이하이며, 기타 불가피한 성분들은 개별적으로 0.02wt% 이하로 하되 그 합은 0.10wt% 이하, 그리고 잔부의 Al으로 조성되는 개량 6082 알루미늄 합금에 있어서 상기 Cu의 함량을 0.05wt%이하에서 Cu 0.2wt% 이하로 증가시켜 기계적 특성을 증가시키고 압출 압력의 감소 효과를 얻을 수 있는데 기술적 특징이 있다.The high-strength aluminum alloy excellent in formability of the present invention is an Al-Mg-Si alloy that has a strength suitable for automobile parts, and includes Si 0.95 to 1.05 wt%, Mg 0.5 to 0.6 wt%, Mn 0.5 to 0.6 wt%, and Fe. 0.15 ~ 0.25wt%, Cr 0.13 ~ 0.18wt%, Cu 0.05wt% or less, Ti 0.03wt% or less, Zn 0.05wt% or less, and other unavoidable components are individually 0.02wt% or less, and the sum is 0.10wt% In addition, in the improved 6082 aluminum alloy composed of remainder Al, the Cu content may be increased from 0.05 wt% or less to 0.2 wt% or less of Cu to increase mechanical properties and to obtain an effect of reducing extrusion pressure. have.
본 발명은 상기 개량 6082 알루미늄 합금의 Cu 함량을 0.2% 이하로 증가시키며, 본 발명의 각 성분 함량을 한정한 이유는 다음과 같다.The present invention increases the Cu content of the improved 6082 aluminum alloy to 0.2% or less, and the reason for limiting each component content of the present invention is as follows.
Si는 Mg와 결합하여 시효에 의해 Mg2Si로 석출되어 기계적 성질을 좌우하며, Mg와 결합하고 남은 잔류 Si는 단독으로 석출되어 기계적 성질을 향상시키고, 용탕 의 유동성 개선에 유효한 성분으로서, 0.95wt%에 미치지 못하면 원하는 강도를 얻을 수 없게 되고, 1.05wt%를 초과하게 되면 압출성이 떨어지게 될 뿐만 아니라 압 출제품의 표면 품질의 저하를 초래하게 된다.Si is combined with Mg and precipitated as Mg 2 Si by aging to influence the mechanical properties.The remaining Si combined with Mg is precipitated alone to improve mechanical properties and 0.95wt as an effective component for improving the fluidity of the melt. If it is less than%, the desired strength cannot be obtained, and if it exceeds 1.05 wt%, not only the extrudability is degraded but also the surface quality of the extruded product is degraded.
Mg은 상기 Si와 화합물로 석출되어 기계적 성질을 향상시키는 성분으로서, 그 함량이 0.5wt%에 미치지 못하면 Mg2Si 석출량이 부족하여 필요한 만큼의 강도를 얻을 수 없으며, 0.6wt%를 초과하면 압출성이 저하되어 생산성이 떨어지게 될 뿐만 아니라 Mg2Si를 형성하지 못한 여분의 Mg가 Mg2Si의 고용을 억제하여 강도를 떨어뜨리게 된다.Mg is a component that is precipitated with the Si and the compound to improve the mechanical properties, if the content is less than 0.5wt% Mg 2 Si precipitate amount is insufficient to obtain the strength as necessary, if exceeding 0.6wt% extrudability this is reduced, it is failed to form a Mg 2 Si, as well as to be fall in productivity tteurige extra Mg drop the strength by suppressing the employment of Mg 2 Si.
Mn은 내식성을 저하시키지 않으면서 강도를 향상시키며, 결정립 미세화에 유효한 성분으로서, 그 함량이 0.5wt%에 미치지 못하면 합금조직의 미세화에 의한 강도 향상 효과가 적고, 0.6wt%를 초과하면 오히려 강도를 저하시키게 되는 특성을 나타낸다.Mn improves strength without deteriorating corrosion resistance and is an effective ingredient for grain refinement.If the content is less than 0.5wt%, Mn has a small effect of improving strength due to miniaturization of alloy structure. It shows the characteristic to fall.
Cu는 기계적 특성을 향상시키는 동시에 압출특성을 향상시키는 효과를 나타내지만 그 함량이 0.2wt%를 초과하게 되면 내식성이 저하될 뿐만 아니라 Al2CuMg 및 Al5Cu2Mg8Si6과 같은 개재물을 형성하기 때문에 압출특성이 저하되므로 Cu의 함량을 0.2wt% 이하로 하는 것이 바람직하다.Cu has the effect of improving the mechanical properties and the extrusion properties, but when the content exceeds 0.2wt%, not only the corrosion resistance is lowered, but also inclusions such as Al 2 CuMg and Al 5 Cu 2 Mg 8 Si 6 are formed. Therefore, since extrusion property falls, it is preferable to make Cu content into 0.2 wt% or less.
Fe는 재결정립의 조대화를 억제하고 주조시 결정립을 미세화하는 효과가 있는 성분으로서, 0.15wt%에 미치지 못하면 불순물로서 작용할 뿐 합금화 효과가 미미하며, 0.25wt%를 초과하면 연성을 저하시킬 뿐만 아니라 압출성과 생산성을 떨어뜨리게 된다.Fe is an ingredient that suppresses coarsening of recrystallized grains and refines grains during casting.If it is less than 0.15wt%, Fe acts as an impurity, but the alloying effect is insignificant. This will reduce the extrudability and productivity.
Cr은 재결정층의 생성과 성장을 억제하며 Al, Fe와 함께 화합물을 형성하여 입계에 분포함으로써 시효처리시의 석출을 억제하여 연신율을 증가시켜 주는 역할을 하는바, 그 함량이 0.13wt%에 미치지 못하면 재결정층 억제 효과가 미미하여 피로강도가 저하되며, 0.18wt%를 초과하게 되면 압출성이 떨어지게 된다.Cr inhibits the formation and growth of the recrystallized layer and forms a compound with Al and Fe and distributes it at grain boundaries, thereby inhibiting precipitation during aging treatment and increasing elongation. The content is less than 0.13 wt%. If it does not, the recrystallization layer suppression effect is insignificant, the fatigue strength is lowered, and when it exceeds 0.18wt%, the extrudability is deteriorated.
Ti은 입자 미세화에 효과가 있는 성분으로서, 0.03wt%를 초과하게 되면 압출성을 떨어뜨리게 되며, Zn은 내식성과 기계적 성질을 향상시키는 성분으로서, 그 함량이 0.05wt%를 초과하게 되면 Ti과 같이 압출성을 저하시키게 된다.Ti is an effective component for particle refinement, and when exceeding 0.03wt%, the extrudability is decreased.Zn is a component that improves corrosion resistance and mechanical properties.When the content exceeds 0.05wt%, It will reduce the extrudability.
상기와 같이 조성되는 본 발명의 성형성이 우수한 고강도 알루미늄 합금은 특히 개량 6082 알루미늄 합금에 Cu의 함량을 증가시킴으로써 기계적 특성과 압출성을 향상시키게 되는바, 이를 자세히 살펴보면 다음과 같다.The high-strength aluminum alloy excellent in formability of the present invention, as described above, improves mechanical properties and extrudability by increasing the content of Cu, particularly in the improved 6082 aluminum alloy.
Cu는 Al에 고용될 경우 Mg만큼의 격자상수를 크게 변화시키며 이로 인하여 고용강화의 효과를 얻을 수 있으며, 미세한 Mg2Si 석출량을 증가시켜 Mg2Si에 의한 시효경화 효과를 향상시켜 기계적 특성을 향상시킨다.When Cu is dissolved in Al, the lattice constant as much as Mg is greatly changed, and thus, the effect of solid solution can be obtained. By increasing the amount of fine Mg 2 Si precipitation, Cu improves the aging hardening effect of Mg 2 Si, thereby improving mechanical properties. Improve.
상기와 같은 기계적 특성은 540℃에서 1시간 동안 용체화처리한 후 170℃로 에이징하여 측정하였으며, 에이징시간에 따른 측정결과를 표 1과 표 2에 나타내었다.The mechanical properties as described above were measured by aging at 170 ° C. after solution treatment at 540 ° C. for 1 hour, and the measurement results according to the aging time are shown in Table 1 and Table 2.
표 1은 개량 6082 알루미늄 합금, 표 2는 개량 6082 알루미늄 합금의 Cu 함량을 0.2%로 증가시킨 것이다.Table 1 shows the Cu content of the improved 6082 aluminum alloy and Table 2 increased the Cu content to 0.2%.
상기 표 1과 표 2에 나타난 바와 같이 540℃에서 1시간 동안 용체화 처리한 후 에이징 시간에 따른 기계적 특성을 측정한 결과를 살펴보면, 6시간 에이징 한 경우가 가장 우수한 기계적 특성을 갖는 것을 알 수 있으며, 개량 6082 알루미늄 합금의 함량이 0.05wt%인 경우보다 0.2wt%인 경우가 기계적 특성이 향상되었음을 확인할 수 있다.As shown in Table 1 and Table 2, after looking at the results of measuring the mechanical properties according to the aging time after the solution treatment at 540 ℃ for 1 hour, it can be seen that 6 hours aging has the best mechanical properties. It can be seen that the mechanical properties are improved in the case of 0.2wt% than the content of the improved 6082 aluminum alloy is 0.05wt%.
또한, Cu는 도 1에 도시된 바와 같이 Mg에 비해 압출 압력의 감소 효과를 얻을 수 있기 때문에 압출성을 향상시킨다. In addition, since Cu can obtain the effect of reducing the extrusion pressure compared to Mg as shown in Figure 1 improves the extrudability.
하지만 0.4wt% 이상 Cu의 첨가시 Al2CuMg 및 Al5Cu2Mg8Si6과 같은 불건전 개재물이 형성되어 압출성을 저해시키기 때문에 그 이하로 첨가시키는 것이 바람직하다.However, when 0.4 wt% or more of Cu is added, since unhealthy inclusions such as Al 2 CuMg and Al 5 Cu 2 Mg 8 Si 6 are formed to impair extrudability, it is preferable to add less than Cu.
Cu는 내식성에 취약한 영향을 줄 수 있는바, Cu의 함량을 0.1wt%~0.4wt%로 하여 상기 함량이 각각 함유된 알루미늄 합금을 시험재로하여 각 조건에 따른 내식성 시험을 하였으며 그 결과를 도 2에 나타내었다.Cu may have a weak influence on corrosion resistance. The Cu content was 0.1wt% to 0.4wt%, and the aluminum alloy containing the above content was tested as a test material for each condition. 2 is shown.
각 조건에 따른 내식성은 상기의 시험재를 KS D 9502 규격에 따른 염무분수 시험하여 측정하였으며, 그 결과 720시간 이후에는 모든 시험재에서 백청이 발생하였다.Corrosion resistance according to each condition was measured by the salt fraction test according to the standard KS D 9502, and as a result white rust occurred in all test materials after 720 hours.
이때, 0.1wt% Cu와 0.2wt% Cu가 함유된 시험재에서는 300시간 이후부터 변색이 시작되었으며, 0.3wt% Cu와 0.4wt% Cu가 함유된 시험재에서는 200시간 이전부터 변색이 시작된 것을 확인할 수 있었다.At this time, in the test material containing 0.1wt% Cu and 0.2wt% Cu, discoloration started after 300 hours, and in the test material containing 0.3wt% Cu and 0.4wt% Cu, discoloration started from 200 hours before. Could.
그리고 RN(Rating number)결과 0.1wt% Cu와 0.2wt% Cu가 함유된 시험재가 0.3wt% Cu와 0.4wt% Cu가 함유된 시험재보다 내식성이 우수한 것으로 확인되었다.And RN (Rating number) results showed that the test material containing 0.1wt% Cu and 0.2wt% Cu was superior to the test material containing 0.3wt% Cu and 0.4wt% Cu.
상기와 같은 결과를 통하여 0.2wt%이하의 Cu가 함유된 개량 6082 알루미늄 합금은 우수한 내식성과 압출 압력 증가의 효과를 줄여 압출성을 향상시킬 수 있는 성질을 가짐을 확인할 수 있었다.Through the above results, it can be seen that the improved 6082 aluminum alloy containing less than 0.2wt% of Cu has a property of improving extrudability by reducing the effect of excellent corrosion resistance and an increase in extrusion pressure.
도 1은 6000계열 알루미늄 합금의 균질화 처리 후 첨가원소량에 대한 압출력 변화를 나타낸 그래프.1 is a graph showing the change in extrusion force for the amount of added elements after homogenization treatment of 6000 series aluminum alloy.
도 2는 6000계열 알루미늄 합금에 Cu의 첨가량에 따른 내식성 시험 결과를 나타낸 그림.Figure 2 shows the corrosion resistance test results according to the addition amount of Cu to 6000 series aluminum alloy.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110079716A (en) * | 2019-05-23 | 2019-08-02 | 捷安特轻合金科技(昆山)股份有限公司 | It is automobile body-used to contain high manganese chromium 6XXX line aluminium alloy material and preparation method thereof |
| CN110129634A (en) * | 2019-05-23 | 2019-08-16 | 捷安特轻合金科技(昆山)股份有限公司 | A kind of high manganese 6XXX line aluminium alloy of the high energy absorption capacity of impact resistance and preparation method thereof |
| CN110952050A (en) * | 2019-11-22 | 2020-04-03 | 天津忠旺铝业有限公司 | Heat treatment processing technology for 6082 aluminum alloy medium plate |
| CN111471902A (en) * | 2020-05-22 | 2020-07-31 | 天津忠旺铝业有限公司 | Processing method of 6082 aluminum alloy plate for high-performance rail transit |
| KR20220064543A (en) | 2020-11-12 | 2022-05-19 | 주식회사 대우경금속 | 6xxx series aluminium alloy extruded material with excellent tensile properties and its manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110079716A (en) * | 2019-05-23 | 2019-08-02 | 捷安特轻合金科技(昆山)股份有限公司 | It is automobile body-used to contain high manganese chromium 6XXX line aluminium alloy material and preparation method thereof |
| CN110129634A (en) * | 2019-05-23 | 2019-08-16 | 捷安特轻合金科技(昆山)股份有限公司 | A kind of high manganese 6XXX line aluminium alloy of the high energy absorption capacity of impact resistance and preparation method thereof |
| CN110129634B (en) * | 2019-05-23 | 2021-10-22 | 鼎镁新材料科技股份有限公司 | Impact-resistant high-energy-absorption high-manganese 6XXX series aluminum alloy and preparation method thereof |
| CN110079716B (en) * | 2019-05-23 | 2021-12-03 | 鼎镁新材料科技股份有限公司 | High-manganese-chromium-6 XXX series aluminum alloy material for automobile body and preparation method thereof |
| CN110952050A (en) * | 2019-11-22 | 2020-04-03 | 天津忠旺铝业有限公司 | Heat treatment processing technology for 6082 aluminum alloy medium plate |
| CN111471902A (en) * | 2020-05-22 | 2020-07-31 | 天津忠旺铝业有限公司 | Processing method of 6082 aluminum alloy plate for high-performance rail transit |
| KR20220064543A (en) | 2020-11-12 | 2022-05-19 | 주식회사 대우경금속 | 6xxx series aluminium alloy extruded material with excellent tensile properties and its manufacturing method |
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