KR20090128774A - Manufacturing method of aluminum-high magnesium alloy sheet by melts quality and phase control - Google Patents
Manufacturing method of aluminum-high magnesium alloy sheet by melts quality and phase control Download PDFInfo
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- KR20090128774A KR20090128774A KR1020080054705A KR20080054705A KR20090128774A KR 20090128774 A KR20090128774 A KR 20090128774A KR 1020080054705 A KR1020080054705 A KR 1020080054705A KR 20080054705 A KR20080054705 A KR 20080054705A KR 20090128774 A KR20090128774 A KR 20090128774A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 239000000155 melt Substances 0.000 title abstract 2
- 239000011777 magnesium Substances 0.000 claims abstract description 43
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 42
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 26
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 25
- 239000000956 alloy Substances 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 230000001681 protective effect Effects 0.000 claims abstract description 16
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000002844 melting Methods 0.000 claims abstract description 7
- 230000008018 melting Effects 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 8
- 238000009210 therapy by ultrasound Methods 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 7
- 238000000265 homogenisation Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
- 238000005097 cold rolling Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 230000032683 aging Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 20
- 230000003749 cleanliness Effects 0.000 description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 238000005482 strain hardening Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007970 homogeneous dispersion Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000000527 sonication Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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Classifications
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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
- C22F1/047—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 with magnesium as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- 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
Abstract
Description
본 발명은 알루미늄-고함량 마그네슘 합금 판재 제조방법에 관한 것으로, 더욱 상세하게는 5xxx 계열 알루미늄-고함량 마그네슘 합금에 있어서 마그네슘이 과량 첨가되더라도 용탕의 청정도를 제어할 수 있고, 합금의 가공경화 및 고용강화 효과에 의해 기계적 특성 및 성형성을 향상시킬 수 있는 알루미늄-고함량 마그네슘 합금 판재 제조방법 및 이를 이용하여 제조된 알루미늄-고함량 마그네슘 합금에 관한 것이다.The present invention relates to a method for manufacturing an aluminum-high magnesium alloy sheet, and more particularly, in the 5xxx series aluminum-high magnesium alloy, even if magnesium is added in an excessive amount, the cleanliness of the molten metal can be controlled, and the work hardening and solid solution of the alloy can be controlled. The present invention relates to a method for producing an aluminum-high content magnesium alloy plate material capable of improving mechanical properties and formability by a reinforcing effect, and an aluminum-high content magnesium alloy produced using the same.
마그네슘은 5xxx계열 알루미늄 합금의 주 합금원소로, 알루미늄에 중량비로 최대 17.4%까지 고용될 수 있으며, 고용된 마그네슘 합금에 의한 가공경화가 5xxx 계 알루미늄-고함량 마그네슘 합금의 주요한 특성이 된다.Magnesium is the main alloying element of 5xxx series aluminum alloys, and can be dissolved in aluminum by up to 17.4% by weight. Work hardening by the employed magnesium alloys is the main characteristic of 5xxx series aluminum-high content magnesium alloys.
가공경화 효과는 이론적으로 마그네슘의 함량이 늘어남에 따라 상승하고, 경량화에 도움이 되지만, 실험적으로는 중량비로 8.5% 이상에서는 열간가공성이 현격히 저하되어 가공이 불가능하게 된다고 알려져 있다.The work hardening effect theoretically increases with increasing magnesium content, which helps in weight reduction, but experimentally, it is known that the hot workability is significantly lowered by 8.5% or more by weight ratio, making it impossible to process.
또한, 마그네슘은 중량비로 4% 이하에서는 고용강화의 효과가 떨어지며, 6% 이상에서는 β상(FCC) Al3Mg2이 슬립 밴드와 결정립계에서 석출되어 입계부식(intergranular attack)과 응력부식균열 (Stress-corrosion crack, SCC)을 유발하게 된다.In addition, magnesium is less effective in solid solution at 4% or less by weight ratio, and at 6% or more, β phase (FCC) Al 3 Mg 2 precipitates in slip bands and grain boundaries, resulting in intergranular attack and stress corrosion cracking (Stress). -corrosion crack (SCC).
한편, 마그네슘은 약 450℃ 이상에서 자연발화를 일으키는 특징을 가지고 있다. 따라서, 5xxx 계 알루미늄-고함량 마그네슘 합금을 만드는 현장에서는 이러한 발화특성으로 인하여, 발생하는 마그네슘의 손실을 보충하기 위하여, 목적 조성보다 많은 마그네슘을 첨가하고 있으며, 마그네슘의 발화를 최소한으로 줄이기 위하여 알루미늄 용탕에 첨가 시 알루미늄보다 가벼워서 용탕 위로 부유하는 마그네슘을 용탕 속에서 유지하기 위하여 철재 기구를 이용하여 장시간 유지하는 과정을 거치게 되므로, 용탕의 오염뿐만 아니라 마그네슘의 발화를 근본적으로 해결하지 못하는 문제점이 있다.On the other hand, magnesium is characterized by spontaneous ignition at about 450 ℃ or more. Therefore, in the field of making 5xxx aluminum-high magnesium alloy, more magnesium is added than the target composition to compensate for the loss of magnesium due to this ignition characteristic, and aluminum molten metal is minimized to minimize the ignition of magnesium. When it is added to the aluminum, it is lighter than aluminum, so that the magnesium is suspended over the molten metal in a molten metal for a long time using a steel mechanism, and thus there is a problem in that it does not fundamentally solve not only the contamination of the molten metal but also the ignition of magnesium.
본 발명이 해결하고자 하는 기술적 과제는, 마그네슘이 과량 첨가된 알루미늄-고함량 마그네슘 합금(Al-High Mg 합금)에 있어서, 마그네슘의 함량이 증가함에 따라 발생하는 발화현상을 제어함으로써 용탕의 청정도를 향상시키고, 마그네슘의 과량첨가에 의한 열악한 압연특성을 가공 및 열처리 조건 등을 조절하여 개선함으로써 건전한 판재를 제조하며, 열처리 조건을 제어하여 마그네슘의 고용강화 효과 를 극대화함으로써 기계적 특성 및 성형성을 향상시키는 데 있다.The technical problem to be solved by the present invention is to improve the cleanliness of the molten metal by controlling the ignition that occurs as the magnesium content increases in the aluminum-high magnesium alloy (Al-High Mg alloy) to which magnesium is added excessively And improve the poor rolling characteristics by excessive addition of magnesium by controlling the processing and heat treatment conditions to manufacture sound plates, and improve the mechanical properties and formability by maximizing the solid solution strengthening effect of magnesium by controlling the heat treatment conditions. have.
상기 기술적 과제를 해결하기 위하여 본 발명은, 주조 공정에 의해 마그네슘이 첨가된 알루미늄 합금을 제조하는 알루미늄-고함량 마그네슘 합금 판재 제조방법에 있어서, (S1)알루미늄을 용해로에 장입하여 용해한 후 테트라플루오로에탄을 포함하는 보호가스 분위기를 유지한 상태로 알루미늄 용탕에 마그네슘을 첨가하여 합금을 제조하는 단계; (S2)제조된 합금 용탕을 주형에 주조하는 단계; 및 (S3)상기 제조된 합금을 압연공정 및 열처리를 통해 알루미늄-고함량 마그네슘 합금 판재를 제조하는 단계를 포함하는 것을 특징으로 한다.In order to solve the above technical problem, the present invention, in the aluminum-high magnesium alloy sheet manufacturing method for producing an aluminum alloy to which magnesium is added by a casting process, (S1) aluminum is charged in a melting furnace and dissolved after tetrafluoro Preparing an alloy by adding magnesium to the molten aluminum while maintaining a protective gas atmosphere including ethane; (S2) casting the produced molten alloy into a mold; And (S3) characterized in that it comprises the step of manufacturing the aluminum-high content magnesium alloy sheet material by the rolling process and heat treatment the prepared alloy.
본 발명의 알루미늄-고함량 마그네슘 합금 판재 제조방법에 따르면, 테트라플루오로에탄을 포함하는 보호가스 분위기에서 혼합 용탕을 제조함으로써 마그네슘 함량 증가에 따라 발생하는 발화 현상을 제어하여 용탕의 청정도를 향상시키고 마그네슘의 손실을 감소시킬 수 있다.According to the manufacturing method of the aluminum-high magnesium alloy sheet of the present invention, by producing a mixed molten metal in a protective gas atmosphere containing tetrafluoroethane to control the ignition generated by increasing the magnesium content to improve the cleanliness of the molten magnesium Can reduce the loss.
본 발명은 또 상기 알루미늄-고함량 마그네슘 합금 판재 제조방법을 이용하여 제조된 알루미늄-고함량 마그네슘 합금을 제공한다.The present invention also provides an aluminum-high magnesium alloy prepared by using the aluminum-high magnesium alloy sheet production method.
본 발명에 따르면, 마그네슘의 함량 증가에 따라 발생하게 되는 발화현상을 제어하고 초음파 처리 공정을 적용함으로써 용탕의 청정도를 향상시킬 수 있으며, 용탕의 청정도 향상과 가공 및 열처리 조건의 제어를 통하여 건전한 알루미늄-고함량 마그네슘 합금 판재를 제조하고 고용강화 효과를 통해 기계적 특성 및 성형성을 향상시킬 수 있다.According to the present invention, the cleanliness of the molten metal can be improved by controlling the ignition caused by the increase of the magnesium content and applying an ultrasonic treatment process, and improving the cleanliness of the molten metal and controlling the processing and heat treatment conditions. -It can manufacture high content magnesium alloy plate and improve mechanical properties and formability through solid solution strengthening effect.
본 발명에 따른 알루미늄-고함량 마그네슘 합금은 차량용 후드(hood), 펜더(fender), 트렁크-리드(trunk-lid), 루프(roof)와 같은 자동차 부품의 경량화에 의해 연비를 절감시키고 지구온난화에 대응할 수 있는 친환경 소재로 널리 활용될 것으로 기대된다.The aluminum-containing magnesium alloy according to the present invention reduces fuel economy and reduces global warming by lightening automobile parts such as a vehicle hood, a fender, a trunk-lid, a roof, and the like. It is expected to be widely used as an eco-friendly material to cope with.
이하, 본 발명을 실시예를 통해 더욱 상세하게 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
본 발명의 알루미늄-고함량 마그네슘 합금 판재 제조방법은, 주조 공정에 의해 마그네슘이 첨가된 알루미늄 합금을 제조하는 알루미늄-고함량 마그네슘 합금 판재 제조방법에 있어서, (S1)알루미늄을 용해로에 장입하여 용해한 후 테트라플루오로에탄을 포함하는 보호가스 분위기를 유지한 상태로 알루미늄 용탕에 마그네슘을 첨가하여 합금을 제조하는 단계; (S2)제조된 합금 용탕을 주형에 주조하는 단계; 및 (S3)상기 제조된 합금을 압연공정 및 열처리를 통해 알루미늄-고함량 마그네슘 합금 판재를 제조하는 단계를 포함하는 것을 특징으로 한다.In the method for producing an aluminum-high magnesium alloy sheet of the present invention, in the method for producing an aluminum-high magnesium alloy sheet for producing an aluminum alloy containing magnesium by a casting process, after (S1) aluminum is charged into a melting furnace and dissolved therein, Preparing an alloy by adding magnesium to the aluminum molten metal while maintaining a protective gas atmosphere including tetrafluoroethane; (S2) casting the produced molten alloy into a mold; And (S3) characterized in that it comprises the step of manufacturing the aluminum-high content magnesium alloy sheet material by the rolling process and heat treatment the prepared alloy.
일반적으로 사용되는 상용 알루미늄-고함량 마그네슘 합금은 마그네슘 함량이 3 내지 4% 내외의 범위를 가지기 때문에 알루미늄 용탕에 마그네슘을 첨가할 때 심각한 발화 현상이 발생하지 않는다. 그러나 마그네슘의 함량이 8% 이상일 경우에는 마그네슘의 발화 특성으로 인하여 용탕의 청정도가 저하되고 첨가된 마그네슘의 손실분이 급격히 증가하게 된다.Since commercially available aluminum-containing magnesium alloys generally have a magnesium content in the range of about 3 to 4%, no serious ignition occurs when magnesium is added to the molten aluminum. However, when the magnesium content is more than 8%, the cleanliness of the molten metal decreases due to the ignition characteristics of magnesium, and the loss of added magnesium increases rapidly.
본 발명의 알루미늄-고함량 마그네슘 합금 판재 제조방법에 따르면, 혼합 용 탕 제조 시에 테트라플루오로에탄을 포함하는 보호가스를 이용함으로써 마그네슘 함량 증가에 따라 발생하는 발화 현상을 제어할 수 있으며, 이를 통해 용탕의 청정도를 향상시키고 마그네슘의 손실을 감소시킬 수 있다.According to the manufacturing method of the aluminum-high magnesium alloy sheet of the present invention, by using a protective gas containing tetrafluoroethane in the production of the mixing molten metal it is possible to control the ignition phenomenon caused by the increase in magnesium content, through It can improve the cleanliness of the molten metal and reduce the loss of magnesium.
도 1은 알루미늄-고함량 마그네슘 합금 판재 제조에 있어서 보호가스(HFC-134a/Air 혼합 가스)를 사용한 경우와 보호가스를 사용하지 않은 경우의 잔탕을 비교한 사진이다. 여기서, 보호가스를 사용한 경우 보호가스는 1 분당 100~10,000ppm/0.5~10L 의 양으로 사용하였다. 도 1을 보면 보호가스를 사용한 경우가 그렇지 않은 경우에 비해 알루미늄-고함량 마그네슘 합금 용탕의 고유의 색을 띄는 것을 확인할 수 있으며, 이를 통해 보호가스를 사용함으로써 용탕의 청정도를 제어하고 마그네슘의 손실분을 제어할 수 있음을 확인할 수 있다. FIG. 1 is a photograph comparing the residual water when the protective gas (HFC-134a / Air mixed gas) is used and the protective gas is not used in the production of aluminum-containing magnesium alloy sheet. Here, in the case of using a protective gas, the protective gas was used in an amount of 100 to 10,000 ppm / 0.5 to 10 L per minute. Referring to FIG. 1, it can be seen that the use of the protective gas has a unique color of the aluminum-containing magnesium alloy molten metal, compared to the case where the protective gas is not used, thereby controlling the cleanliness of the molten metal by using the protective gas and reducing the loss of magnesium. You can see that it can be controlled.
(S1)단계에서 마그네슘은 혼합 용탕 기준으로 6 내지 12 중량%가 첨가될 수 있다. 또한, 마그네슘에 더하여 상기 혼합 용탕 기준으로 0.01 내지 1.2 중량%의 망간, 0.03 내지 0.15 중량%의 철 및 0.01 내지 0.06 중량%의 실리콘이 더 첨가될 수 있다.In step (S1), magnesium may be added to 6 to 12% by weight based on the mixed melt. In addition, in addition to magnesium, 0.01 to 1.2% by weight of manganese, 0.03 to 0.15% by weight of iron, and 0.01 to 0.06% by weight of silicon may be further added based on the mixed melt.
상기 (S1)단계 후에는 합금 용탕에 초음파 처리 공정을 적용하여 금속 용탕의 청정도를 향상시킬 수 있다. 일반적으로 용탕의 청정도를 확보하기 위하여 사용되고 있는 각종 첨가물은 요구되는 조성을 만족하지 못하면 오히려 청정도가 저하되는 문제점이 발생한다. 따라서, 용탕 내에서 선택적으로 유해가스 및 개재물을 제어함으로써 청정 용탕을 얻을 수 있을 뿐만 아니라, 결정립 미세화 효과와 유효한 개재물의 균질한 분산 및 알루미늄 합금 내에서의 수소의 탈가스 효과를 얻을 수 있는 초음파 처리 공정을 적용함으로써 알루미늄-고함량 마그네슘 합금의 특성을 향상시킬 수 있다. After the step (S1), it is possible to improve the cleanliness of the metal molten metal by applying an ultrasonic treatment process to the molten alloy. In general, various additives used to secure the cleanliness of the molten metal do not satisfy the required composition, but rather, the cleanliness decreases. Therefore, by selectively controlling harmful gases and inclusions in the molten metal, not only a clean molten metal can be obtained, but also an ultrasonic treatment for obtaining a grain refinement effect, homogeneous dispersion of effective inclusions, and degassing effect of hydrogen in an aluminum alloy. By applying the process, the properties of the aluminum-high magnesium alloy can be improved.
초음파 처리 공정은 (S1)단계 후 혼합 용탕에 15 내지 25kHz의 초음파를 0.5 내지 30분 동안 인가하는 방식으로 진행될 수 있다. 여기서, 초음파 처리 공정을 위하여 용해로로는 전기저항식 용해로가 사용될 수 있다. The sonication process may be performed by applying ultrasonic waves of 15 to 25 kHz to the mixed melt for 0.5 to 30 minutes after the step (S1). Here, an electric resistance melting furnace may be used as the melting furnace for the ultrasonic treatment process.
(S3) 단계에서는 면삭, 균질화 열처리, 열간, 온간 및 냉간 압연하여 합금 판재를 제조하는 단계가 이루어진다. 여기서, 주조 후 합금 내에 존재하는 비평형상을 제거하고, 합금 자체의 균질성을 확보하기 위하여 균질화 열처리를 하였다. 균질화 열처리는 제조된 합금을 4℃/분으로 430 내지 480℃에서 12 내지 36 시간 동안 유지한 후 로냉함에 의해 수행될 수 있으며, 열처리 이후 열간, 온간 및 냉간 압연을 행하였다.In the step (S3), the step of manufacturing the alloy sheet is made by roughing, homogenizing heat treatment, hot, warm and cold rolling. Here, after casting, the non-equilibrium present in the alloy was removed, and homogenization heat treatment was performed to ensure homogeneity of the alloy itself. Homogenization heat treatment can be carried out by holding the alloy prepared at 4 ℃ / min at 430 to 480 ℃ for 12 to 36 hours, then by cooling, and subjected to hot, warm and cold rolling after the heat treatment.
한편, 면삭, 균질화 열처리 및 압연 공정을 거친 후에는, 알루미늄-고함량 마그네슘 합금 판재 내에 존재하는 β상을 기지 내로 고용시키기 위하여 상기 판재를 300 내지 360℃에서 1 내지 3 시간 유지하여 로냉하는 소둔 열처리 및 360 내지 480℃에서 10 내지 90분 동안 유지한 뒤 수냉한 후 자연시효를 하는 T4 열처리를 할 수 있다.On the other hand, after undergoing the roughing, homogenization heat treatment and rolling process, in order to solidify the β phase present in the aluminum-high magnesium alloy plate into the matrix, the annealing heat treatment is performed by quenching the plate by maintaining the plate at 300 to 360 ° C. for 1 to 3 hours. And after maintaining for 10 to 90 minutes at 360 to 480 ℃ can be subjected to T4 heat treatment to natural aging after water cooling.
실시예 1Example 1
알루미늄을 전기저항식 용해로에 장입하여 HFC-134a(테트라플루오로에탄) 및 공기의 혼합 가스 분위기에서 용해하여 용탕을 제조하고, 위의 혼합 가스 분위기를 유지하면서 알루미늄 용탕에 마그네슘, 망간, 철 및 규소 분말을 첨가하고 교반하여 혼합 용탕을 제조하였다. 이때, 알루미늄, 마그네슘, 망간, 철 및 규소의 조성비(중량 기준)는 하기 표 1과 같다. 그 후, 제조된 혼합 용탕에 19kHz의 초음파를 10분 동안 인가하는 초음파 처리 단계를 거쳤다. Charge aluminum into an electric resistance melting furnace to dissolve it in a mixed gas atmosphere of HFC-134a (tetrafluoroethane) and air to produce a molten metal, and maintain magnesium, manganese, iron and silicon in the aluminum melt while maintaining the mixed gas atmosphere above. Powder was added and stirred to prepare a mixed melt. At this time, the composition ratio (based on weight) of aluminum, magnesium, manganese, iron and silicon is shown in Table 1 below. Thereafter, an ultrasonic treatment step of applying ultrasonic waves of 19 kHz to the prepared mixed melt for 10 minutes was performed.
이어서 합금을 주조하고, 면삭 및 균질화 열처리, 열간, 온간 및 냉간 압연 공정을 통해 판재를 제조하였다. 여기서, 균질화 열처리는 혼합 용탕을 4℃/분으로 430℃에서 24시간 동안 유지한 후 로냉하며, 열처리 이후 열간, 온간 및 냉간 압연을 행하였다.The alloy was then cast and plated through a face and homogenization heat treatment, hot, warm and cold rolling process. Here, in the homogenization heat treatment, the mixed molten metal was kept at 4 ° C./min at 430 ° C. for 24 hours and then cooled by heat, followed by hot, warm and cold rolling.
다음으로, 제조된 판재를 300℃에서 3시간 유지하여 로냉하는 소둔 열처리 단계 및 430℃에서 30분 동안 유지한 뒤 수냉한 후 자연시효를 하는 T4 열처리 단계를 진행하였다.Next, the annealing heat treatment step of holding the prepared plate material at 300 ° C. for 3 hours and quenching was performed for 30 minutes at 430 ° C., followed by T4 heat treatment step of natural cooling.
실시예 2Example 2
알루미늄, 마그네슘, 망간, 철 및 규소의 조성비(중량 기준)를 하기 표 1과 같이 한 것을 제외하고는 실시예 1과 동일한 방법으로 알루미늄-고함량 마그네슘 합금 판재를 제조하였다.An aluminum-high content magnesium alloy plate was prepared in the same manner as in Example 1 except that the composition ratio (based on weight) of aluminum, magnesium, manganese, iron, and silicon was as shown in Table 1 below.
비교예 1Comparative Example 1
알루미늄, 마그네슘, 망간, 철 및 규소의 조성비(중량 기준)를 하기 표 1과 같이 하고, 용탕 제조시 보호가스로 종래의 가스를 사용하며, 초음파 처리 단계를 거치지 않은 것을 제외하고는 실시예 1과 동일한 방법으로 알루미늄-고함량 마그네슘 합금 판재를 제조하였다.Composition ratios of aluminum, magnesium, manganese, iron, and silicon (based on weight) are as shown in Table 1 below, except that the conventional gas is used as a protective gas when the molten metal is manufactured, and the ultrasonic treatment step is not performed. In the same manner, an aluminum-containing magnesium alloy sheet was produced.
성능 평가Performance evaluation
제조된 알루미늄-고함량 마그네슘 합금 판재는 열처리 후에 ASTM E8 Subsize 규격으로 가공한 뒤에 인장시험을 수행하였고, ASTM E643 규격의 에릭슨 성형시험을 통하여 변형된 높이를 측정함으로써 성형성을 측정하였다.The prepared aluminum-high magnesium alloy sheet was subjected to a tensile test after processing to ASTM E8 Subsize standard after heat treatment, and the moldability was measured by measuring the height of deformation through the Ericsson molding test of ASTM E643 standard.
도 3에 나타나 있듯이, 비교예의 합금보다 마그네슘 함량을 증가시킨 실시예 1 및 실시예 2의 합금 판재는 T4 열처리 이후 비교예 1의 합금 판재보다 향상된 인장특성치를 나타내었다.As shown in FIG. 3, the alloy plates of Example 1 and Example 2 having increased magnesium content than the alloy of Comparative Example showed improved tensile properties than those of Comparative Example 1 after T4 heat treatment.
또한, 실시예 1 및 실시예 2의 성형성 평가결과는 도면 4에 나타나 있다. 성형성 평가를 위한 실시예 1 및 실시예 2의 에릭슨 시험 결과는 각각 10.4 및 9.7mm의 우수한 성형성을 나타내는 것을 확인할 수 있다. In addition, the moldability evaluation result of Example 1 and Example 2 is shown in FIG. Ericsson test results of Example 1 and Example 2 for the evaluation of the moldability can be seen that showing excellent moldability of 10.4 and 9.7mm, respectively.
과량 첨가된 마그네슘의 발화를 방지하고 초음파 처리 공정을 통한 용탕의 청정도를 확보하였으며, 도 5의 미세조직에서 나타난 바와 같이 판재 제조 후에 존재하는 β상을 T4 열처리를 통하여 기지 내로 고용시켜 마그네슘에 의한 고용강화 효과를 향상시킴으로써 기계적 특성 및 성형성이 우수한 5xxx계 알루미늄-고함량 마그네슘 합금을 제조할 수 있었다.To prevent ignition of excessively added magnesium and to ensure the cleanliness of the molten metal through the ultrasonic treatment process, as shown in the microstructure of FIG. By improving the reinforcing effect, it was possible to produce a 5xxx-based aluminum-high magnesium alloy having excellent mechanical properties and formability.
도 1은 알루미늄-고함량 마그네슘 합금 판재 제조에 있어서 보호가스(HFC-134a/Air 혼합 가스)를 사용한 경우(실시예 1)와 보호가스를 사용하지 않은 경우의 잔탕을 비교한 사진이다.1 is a photograph comparing the residual water when the protective gas (HFC-134a / Air mixed gas) is used (Example 1) and the protective gas is not used in the production of aluminum-high magnesium alloy sheet.
도 2는 실시예 1, 실시예 2 및 비교예 1의 알루미늄-고함량 마그네슘 합금 판재의 인장 특성 결과를 나타낸 그래프이다.2 is a graph showing the results of tensile properties of the aluminum-containing magnesium alloy sheet of Example 1, Example 2 and Comparative Example 1.
도 3은 실시예 1 및 실시예 2의 알루미늄-고함량 마그네슘 합금 판재의 에릭슨 시험에 의한 성형성 평가 결과를 나타낸 그래프이다.3 is a graph showing the results of evaluation of formability by the Ericsson test of the aluminum-high magnesium alloy sheet materials of Examples 1 and 2. FIG.
도 4는 실시예 1 및 실시예 2의 열처리 후의 미세조직을 나타낸 사진이다. Figure 4 is a photograph showing the microstructure after the heat treatment of Example 1 and Example 2.
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| KR101238944B1 (en) * | 2010-10-15 | 2013-03-04 | 한국기계연구원 | A Aluminum Casting Alloy and A Manufacturing Method therefor |
| KR101272733B1 (en) * | 2010-11-22 | 2013-06-10 | 자동차부품연구원 | Al-Mg alloy and method of fabricating the same |
| KR101272732B1 (en) * | 2010-11-22 | 2013-06-10 | 자동차부품연구원 | Extruded material of Al-Mg alloy and method of fabricating the same |
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| KR101914532B1 (en) | 2017-02-20 | 2018-11-02 | 주식회사 지아이텍 | Magnesium alloy and method for manufacturing thereof |
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| JP4174527B2 (en) | 2006-05-18 | 2008-11-05 | 株式会社神戸製鋼所 | Aluminum alloy plate manufacturing method and aluminum alloy plate |
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| WO2012070818A3 (en) * | 2010-11-22 | 2012-07-19 | 자동차부품연구원 | Aluminum-magnesium alloy and manufacturing method thereof |
| KR101272733B1 (en) * | 2010-11-22 | 2013-06-10 | 자동차부품연구원 | Al-Mg alloy and method of fabricating the same |
| KR101272732B1 (en) * | 2010-11-22 | 2013-06-10 | 자동차부품연구원 | Extruded material of Al-Mg alloy and method of fabricating the same |
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