KR101274089B1 - High strength aluminum alloys for die casting - Google Patents
High strength aluminum alloys for die casting Download PDFInfo
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- KR101274089B1 KR101274089B1 KR1020100032850A KR20100032850A KR101274089B1 KR 101274089 B1 KR101274089 B1 KR 101274089B1 KR 1020100032850 A KR1020100032850 A KR 1020100032850A KR 20100032850 A KR20100032850 A KR 20100032850A KR 101274089 B1 KR101274089 B1 KR 101274089B1
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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
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
- B22D21/04—Casting aluminium or magnesium
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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
- C22F1/053—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 zinc 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
- C22C—ALLOYS
- C22C2202/00—Physical properties
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Abstract
본 발명은 다이캐스팅용 고강도 알루미늄 합금에 관한 것으로서 특히, 석출경화 열처리를 통하여 우수한 인장강도를 갖고, 크랙발생률이 적어 주조성이 우수한 다이캐스팅용 고강도 알루미늄 합금에 관한 것이다.
본 발명에 의한 다이캐스팅용 고강도 알루미늄 합금은 아연(Zn) 4~7중량%, 마그네슘(Mg) 1~2중량%,, 구리(Cu) 1~2중량%, 지르코늄(Zr) 0.05~0.2중량%, 티타늄(Ti) 0.05~0.2중량%, 스칸듐 0.05~0.2중량% 및 나머지는 알루미늄(Al)과 불순물로 구성된다.The present invention relates to a high-strength aluminum alloy for die casting, and more particularly, to a high-strength aluminum alloy for die casting having excellent tensile strength through precipitation hardening heat treatment and low cracking rate.
High-strength aluminum alloy for die casting according to the present invention is 4 to 7% by weight of zinc (Zn), 1 to 2% by weight of magnesium (Mg), 1 to 2% by weight of copper (Cu), 0.05 to 0.2% by weight of zirconium (Zr). , Titanium (Ti) 0.05 ~ 0.2% by weight, scandium 0.05 ~ 0.2% by weight and the remainder is composed of aluminum (Al) and impurities.
Description
본 발명은 다이캐스팅용 고강도 알루미늄 합금에 관한 것으로서 특히, 석출경화 열처리를 통하여 우수한 인장강도를 갖고, 크랙발생률이 적어 주조성이 우수한 다이캐스팅용 고강도 알루미늄 합금에 관한 것이다.
The present invention relates to a high-strength aluminum alloy for die casting, and more particularly, to a high-strength aluminum alloy for die casting having excellent tensile strength through precipitation hardening heat treatment and low cracking rate.
다이캐스팅(Die casting)은 다이 주조라고도 한다. 필요한 주조형상에 완전히 일치하도록 정확하게 기계가공된 강제(鋼製)의 금형에 용융금속을 주입하여 금형과 똑같은 주물을 얻는 정밀주조법이다. Die casting is also referred to as die casting. It is a precision casting method in which molten metal is injected into a steel mold precisely machined to perfectly match the required casting shape to obtain the same casting as the mold.
그 제품을 다이캐스트 주물이라고 한다. The product is called diecast casting.
상기와 같은 다이캐스팅 주물은 치수가 정확하므로 다듬질할 필요가 거의 없는 장점 외에 기계적 성질이 우수하며, 대량생산이 가능하다는 특징이 있다. 다이캐스팅 주조에 이용되는 금속은 일반적으로 아연, 알루미늄, 주석, 구리, 마그네슘 등의 합금이며, 다이캐스트 주조기를 사용하여 공기압, 수압, 유압 등에 의해 주입하여 냉각 응고시킨다. Die castings as described above have the advantage that almost no need to be trimmed because the dimensions are accurate, the mechanical properties are excellent, and mass production is possible. Metals used for die casting casting are generally alloys of zinc, aluminum, tin, copper, magnesium, and the like, and are cooled and solidified by injection by pneumatic pressure, hydraulic pressure, hydraulic pressure, etc. using a die cast casting machine.
이러한 다이캐스팅 주조법은 여러 분야에 사용되고 있으나 특히, 자동차부품이 많으며, 전기기기, 광학기기, 차량, 방직기, 건축, 계측기 등의 부품 제작 등에 많이 사용되고 있다. The die casting casting method is used in various fields, but in particular, there are many automobile parts, and many parts are used for manufacturing parts such as electric devices, optical devices, vehicles, weaving machines, architecture, measuring instruments, and the like.
일반적으로 다이캐스팅용 알루미늄 합금으로는 주조성이 우수한 Al-Si계 합금 및 Al-Mg계 합금 등이 사용되어 왔으나, 이 합금들은 인장강도가 350MPa 이하로 낮기 때문에 350MPa 이상의 높은 인장강도를 필요로 하는 항공기, 철도차량, 자동차, 전자, 통신용 부품에는 사용이 제한되어 왔다.In general, Al-Si alloys and Al-Mg alloys, which are excellent in castability, have been used as die casting aluminum alloys. However, these alloys have a high tensile strength of 350 MPa or less, so aircraft requiring high tensile strength of 350 MPa or more are required. Its use has been limited in parts for railroad cars, automobiles, electronics and telecommunications.
또한, 350MPa 이상의 인장강도를 갖는 알루미늄 합금은 항공기, 철도차량, 자동차, 전자, 통신용 부품 등에 일부 사용되고는 있으나, 이 합금들은 다이캐스팅용 알루미늄 합금이 아닌 압출, 압연, 단조 등의 소성가공용 알루미늄 합금으로서 소성가공성은 우수하지만 주조시 크랙이 발생하는 주조성이 열악한 문제점이 있었다.In addition, aluminum alloys having a tensile strength of 350 MPa or more are partially used in aircraft, railroad cars, automobiles, electronics, and communication parts. Although excellent workability, there was a problem in that castability was poor when casting occurred.
따라서, 항공기 철도차량, 자동차, 전자, 통신용 부품 등에 사용하기 위하여 350MPa 이상의 높은 인장강도를 갖고 주조성이 우수한 다이캐스팅용 알루미늄 합금 개발에 대한 필요성이 절실히 요구되고 있지만, 현재까지는 350MPa 이상의 인장강도를 가지면서 주조성이 우수한 다이캐스팅용 알루미늄합금이 개발되지 못한 상태에서 인장강도가 350MPa 이하인 Al-Si계 합금 및 Al-Mg계 합금 등이 다이캐스팅용 알루미늄 합금으로 사용되고 있는 실정이다.
Therefore, there is an urgent need for development of die casting aluminum alloy having high tensile strength of 350 MPa or more and excellent casting property for use in aircraft railway vehicles, automobiles, electronics, communication parts, etc. Al-Si alloys and Al-Mg alloys with a tensile strength of 350 MPa or less are used as die casting aluminum alloys in a state where die casting aluminum alloys having excellent castability have not been developed.
본 발명은 상기와 같은 문제점을 해결하기 위하여 안출한 것으로서 아연(Zn), 마그네슘(Mg), 구리(Cu), 지르코늄(Zr), 티타늄(Ti) 및 스칸듐(Sc)으로 합금되어 350MPa 이상의 높은 인장강도를 갖고, 주조시 크랙발생률이 적은 주조성이 우수한 다이캐스팅용 알루미늄 합금을 제공하는 것이 본 발명의 목적이다.
The present invention has been made to solve the above problems, alloyed with zinc (Zn), magnesium (Mg), copper (Cu), zirconium (Zr), titanium (Ti) and scandium (Sc) high tensile of 350MPa or more It is an object of the present invention to provide an aluminum alloy for die casting which has strength and is excellent in castability with little cracking rate during casting.
상기의 목적을 달성하기 위하여 본 발명은 다이캐스팅용 고강도 알루미늄 합금에 있어서, 아연(Zn) 4~7중량%, 마그네슘(Mg) 1~2중량%,, 구리(Cu) 1~2중량%, 지르코늄(Zr) 0.05~0.2중량%, 티타늄(Ti) 0.05~0.2중량%, 스칸듐 0.05~0.2중량% 및 나머지는 알루미늄(Al)으로 구성된다.In order to achieve the above object, the present invention is a high-strength aluminum alloy for die casting, zinc (Zn) 4-7% by weight, magnesium (Mg) 1-2% by weight, copper (Cu) 1-2% by weight, zirconium (Zr) 0.05-0.2% by weight, 0.05-0.2% by weight of titanium (Ti), 0.05-0.2% by weight of scandium and the remainder are made of aluminum (Al).
이때, 상기 알루미늄 합금은 120℃의 온도에서 24시간 동안 시효처리된 것을 특징으로 한다.
At this time, the aluminum alloy is characterized in that aged for 24 hours at a temperature of 120 ℃.
상기와 같이 아연(Zn), 마그네슘(Mg), 구리(Cu), 지르코늄(Zr), 티타늄(Ti) 및 스칸듐(Sc)으로 이루어진 본 발명의 다이캐스팅용 고강도 알루미늄 합금은 350MPa 이상의 높은 인장강도를 갖고, 주조성이 우수하기 때문에 높은 인장강도와 정밀성을 요구하는 항공기, 철도차량, 자동차, 전자 및 통신용 부품 제작을 위한 다이캐스팅용 소재로 사용할 수 있다.
As described above, the high-strength aluminum alloy for die casting of the present invention consisting of zinc (Zn), magnesium (Mg), copper (Cu), zirconium (Zr), titanium (Ti) and scandium (Sc) has a high tensile strength of 350 MPa or more. Because of its excellent castability, it can be used as a die casting material for the production of parts for aircraft, railway vehicles, automobiles, electronics, and communication that require high tensile strength and precision.
이하 본 발명에 의한 다이캐스팅용 고강도 알루미늄 합금에 대하여 상세히 설명한다.Hereinafter, a high strength aluminum alloy for die casting according to the present invention will be described in detail.
본 발명은 아연(Zn), 마그네슘(Mg), 구리(Cu), 지르코늄(Zr), 티타늄(Ti), 스칸듐(Sc) 및 알루미늄(Al)이 합금되어 구성된 다이캐스팅용 고강도 알루미늄 합금으로서, 아연(Zn) 4~7중량%, 마그네슘(Mg) 1~2중량%,, 구리(Cu) 1~2중량%, 지르코늄(Zr) 0.05~0.2중량%, 티타늄(Ti) 0.05~0.2중량%, 스칸듐(Sc) 0.05~0.2중량% 및 나머지는 알루미늄(Al)으로 구성된다.The present invention is a high-strength aluminum alloy for die casting in which zinc (Zn), magnesium (Mg), copper (Cu), zirconium (Zr), titanium (Ti), scandium (Sc) and aluminum (Al) are alloyed. Zn) 4-7 wt%, magnesium (Mg) 1-2 wt%, copper (Cu) 1-2 wt%, zirconium (Zr) 0.05-0.2 wt%, titanium (Ti) 0.05-0.2 wt%, scandium (Sc) 0.05 to 0.2% by weight and the rest is composed of aluminum (Al).
본 발명은 상기 각각의 조성량에 따라서 합금원소 사이에 석출물의 형성이 가능한 합금원소를 첨가하고, 석출경화 열처리를 통하여 알루미늄 기지 금속에 미세한 석출물을 균일하게 분산시킴으로써 인장강도를 향상시킨 다이캐스팅용 고강도 알루미늄 합금이다.
The present invention adds an alloying element capable of forming precipitates between alloying elements according to the respective composition amounts, and improves tensile strength by uniformly dispersing fine precipitates in an aluminum base metal through precipitation hardening heat treatment. Alloy.
상기 각 합금원소의 첨가 및 함량 한정 이유는 다음과 같다.The reasons for the addition and content of each alloy element are as follows.
아연(Zn)은 알루미늄에 합금원소로 첨가되어 인장강도 및 경도 등을 효과적으로 증가시킬 수 있는 원소이다. 본 발명에 의한 다이캐스팅용 고강도 알루미늄 합금에는 아연이 4~7중량%가 첨가되는데, 아연의 함량이 4중량% 미만이면 인장강도 증가효과를 얻을 수 없고, 아연의 함량이 7중량% 이상이면 주조성이 저하되고 열간 취성의 원인이 된다.
Zinc (Zn) is an element that can be added to aluminum as an alloying element to effectively increase tensile strength and hardness. 4-7 wt% of zinc is added to the high-strength aluminum alloy for die casting according to the present invention. This lowers and causes hot brittleness.
마그네슘(Mg)은 Al-Zn 합금에 첨가되어 석출경화 열처리에 의하여 MgZn2 금속간 화합물로 석출됨으로써 인장강도 및 경도를 증가시킬 수 있는 합금원소이다. 본 발명에 의한 다이캐스팅용 고강도 알루미늄 합금에는 마그네슘이 1~2중량%가 첨가되는데, 마그네슘의 함량이 1중량% 미만이면 인장강도의 증가효과를 얻을 수 없고, 마그네슘의 함량이 2중량% 이상이면 결정립계 부식과 응력 부식 등이 발생하여 내식성 저하의 원인이 된다.
Magnesium (Mg) is an alloying element that can be added to the Al-Zn alloy and precipitated as MgZn 2 intermetallic compound by precipitation hardening heat treatment to increase tensile strength and hardness. In the high-strength aluminum alloy for die casting according to the present invention, magnesium is added in an amount of 1 to 2% by weight. If the magnesium content is less than 1% by weight, the effect of increasing tensile strength is not obtained. Corrosion and stress corrosion occur, which causes corrosion resistance.
구리(Cu)는 Al-Zn-Mg 합금에 첨가되어 석출경화 열처리에 의하여 CuMgAl2 금속간 화합물로 석출됨으로써 인장강도 및 경도를 증가시킬 수 있는 합금원소이다. 본 발명에 의한 다이캐스팅용 고강도 알루미늄 합금에는 구리가 1~2중량%가 첨가되는데, 구리의 함량이 1중량% 미만이면 인장강도 증가효과를 얻을 수 없고, 구리의 함량이 2중량% 이상이면 내식성 및 신율 저하의 원인이된다.
Copper (Cu) is an alloying element that can be added to the Al-Zn-Mg alloy and precipitated as CuMgAl 2 intermetallic compound by precipitation hardening heat treatment to increase tensile strength and hardness. In the high-strength aluminum alloy for die casting according to the present invention, copper is added in an amount of 1 to 2% by weight. If the copper content is less than 1% by weight, the tensile strength increase effect is not obtained. If the copper content is 2% by weight or more, corrosion resistance and Cause of lowering elongation.
지르코늄(Zr)은 Al-Zn-Mg 합금에 첨가되어 석출경화 및 결정립 미세화 효과를 얻을 수 있는 합금원소이다. 본 발명에 의한 다이캐스팅용 고강도 알루미늄 합금에는 지르코늄이 0.05~0.2중량%가 첨가되는데, 지르코늄의 함량이 0.05중량% 미만이면 인장강도 증가효과를 얻을 수 없고, 지르코늄의 함량이 0.2중량% 이상이면 신율 저하의 원인이 된다.
Zirconium (Zr) is an alloying element that can be added to an Al-Zn-Mg alloy to obtain precipitation hardening and grain refinement effects. In the high-strength aluminum alloy for die casting according to the present invention, zirconium is added in an amount of 0.05 to 0.2% by weight. If the content of zirconium is less than 0.05% by weight, the tensile strength increase effect cannot be obtained. Cause.
티타늄(Ti)은 Al-Zn-Mg 합금에 첨가되어 결정립 미세화 및 주조재의 크랙방지 효과를 얻을 수 있는 합금원소이다. 본 발명에 의한 다이캐스팅용 고강도 알루미늄 합금에는 티타늄이 0.05~0.2중량%가 첨가되는데, 티타늄의 함량이 0.05중량% 미만이면 결정립 미세화 효과를 얻을 수 없고, 티타늄의 함량이 0.2중량% 이상이면 신율 저하의 원인이 된다.
Titanium (Ti) is an alloying element that can be added to an Al-Zn-Mg alloy to obtain grain miniaturization and crack prevention effects of cast materials. In the high-strength aluminum alloy for die casting according to the present invention, titanium is added in an amount of 0.05 to 0.2% by weight, and when the titanium content is less than 0.05% by weight, the grain refining effect cannot be obtained. Cause.
스칸듐(Sc)은 Al-Zn-Mg 합금에 첨가되어 인장강도 및 경도 등을 효과적으로 증가시킬 수 있는 원소이다. 본 발명에 의한 다이캐스팅용 고강도 알루미늄 합금에는 스칸듐이 0.05~0.2중량%가 첨가되는데, 스칸듐의 함량이 0.05중량% 미만이면 인장강도 증가효과를 얻을 수 없고, 스칸듐의 함량이 0.2중량% 이상이면 신율 저하의 원인이 된다.
Scandium (Sc) is an element that can be added to the Al-Zn-Mg alloy to effectively increase tensile strength and hardness. In the high-strength aluminum alloy for die casting according to the present invention, the scandium is added in an amount of 0.05 to 0.2% by weight. If the content of the scandium is less than 0.05% by weight, the effect of increasing tensile strength is not obtained. Cause.
(실시예)(Example)
본 발명에 따른 다이캐스팅용 고강도 알루미늄 합금에 대하여 본 발명의 바람직한 실시예를 나타낸 첨부 표를 참조하여 상세하게 설명한다.The high strength aluminum alloy for die casting according to the present invention will be described in detail with reference to the accompanying table showing the preferred embodiment of the present invention.
본 발명에 따른 다이캐스팅용 고강도 알루미늄 합금을 제조하기 위해 표 1에 나타낸 조성을 갖는 합금을 통상적인 용융 교반식 알루미늄 합금 제조 방법으로 잉곳을 제조하였다.The alloy having the composition shown in Table 1 for producing a high-strength aluminum alloy for die casting according to the present invention ingot was prepared by a conventional melt stirring aluminum alloy production method.
다시 말하면, 표 1과 같은 조성의 알루미늄 합금을 고주파 유도 용해로를 이용하여 대기 중에서 용해한 후, 주조금형을 이용하여 약 20㎏ 중량의 잉곳을 제조하였다.In other words, the aluminum alloy of the composition shown in Table 1 was dissolved in the air by using a high frequency induction melting furnace, and then an ingot having a weight of about 20 kg was manufactured using a casting mold.
그리고, 상기 잉곳을 보온로에서 용해하고 용탕을 750℃의 온도로 유지한 후에 다이캐스팅 장치를 이용하여 폭 10mm, 길이 100mm, 두께 1mm인 시험편을 주조하였다. 그리고 주조된 시험편을 120℃의 온도에서 24시간 시효 처리하였다.Then, the ingot was dissolved in a heating furnace and the molten metal was kept at a temperature of 750 ° C., and then a test piece having a width of 10 mm, a length of 100 mm, and a thickness of 1 mm was cast using a die casting apparatus. And the cast test piece was aged for 24 hours at the temperature of 120 degreeC.
상기 시험편에 대하여 주조성을 평가하고, 인장시험기를 이용하여 상온에서 인장강도, 항복강도 및 신율을 측정하였다.
Castability of the test piece was evaluated, and tensile strength, yield strength and elongation were measured at room temperature using a tensile tester.
상기 시험편에 대한 주조성 평가는 표 2와 같이 20개 시험편에 0.1mm 이상 크기의 크랙 발생률을 측정하여 평가하였고, 그 결과 표 3과 같이 본 발명에 의한 실시예1 내지 실시예4는 모두 크랙발생률이 10% 이하로 주조성이 우수하게 평가된 반면에, 아연(Zn)이 7중량% 이상 합금된 시험편은 크랙발생률이 20% 이상으로 보통 이하의 주조성을 갖는 것으로 평가되었다.
Castability evaluation for the test piece was evaluated by measuring the crack incidence of 0.1mm or more size in 20 test pieces as shown in Table 2, and as a result, as shown in Table 3, all of the Examples 1 to 4 according to the present invention While the castability was excellently evaluated at 10% or less, the test piece alloyed with zinc (Zn) of 7 wt% or more was evaluated to have a castability of less than or equal to 20% or more.
실시예
Example
비교예
Comparative Example
또한, 본 발명에 의한 시험편을 인장시험기로 상온에서 인장강도, 항복강도 및 신율을 측정하였다. 그 결과, 표 4와 같이, 본 발명의 실시예1 내지 실시예4는 모두 인장강도가 350MPa 이상의 특성을 나타낸다.
In addition, the tensile strength, yield strength and elongation of the test piece according to the present invention was measured at room temperature with a tensile tester. As a result, as shown in Table 4, all of Examples 1 to 4 of the present invention exhibits a tensile strength of 350 MPa or more.
(MPa)The tensile strength
(MPa)
(MPa)Yield strength
(MPa)
(%)Elongation
(%)
실시예
Example
비교예
Comparative Example
즉, 비교예5 내지 비교예8은 인장강도가 350MPa 이상이지만, 주조성이 보통이하인 반면에, 본 발명에 의한 다이캐스팅용 고강도 알루미늄 합금은 인장강도가 350MPa 이상이고, 주조성이 우수하다.
That is, Comparative Examples 5 to 8 have a tensile strength of 350 MPa or more, but castability is usually below, whereas the high-strength aluminum alloy for die casting according to the present invention has a tensile strength of 350 MPa or more and excellent castability.
Claims (2)
아연(Zn) 4~7중량%, 마그네슘(Mg) 1~2중량%, 구리(Cu) 1~2중량%, 지르코늄(Zr) 0.05~0.2중량%, 티타늄(Ti) 0.05~0.2중량%, 스칸듐 0.05~0.2중량% 및 나머지는 알루미늄(Al)으로 구성되고, 120℃의 온도에서 24시간 동안 시효처리된 것을 특징으로 하는 주조성이 우수한 다이캐스팅용 고강도 알루미늄 합금.
In the high strength aluminum alloy for die casting,
4-7% by weight of zinc (Zn), 1-2% by weight of magnesium (Mg), 1-2% by weight of copper (Cu), 0.05-0.2% by weight of zirconium (Zr), 0.05-0.2% by weight of titanium (Ti), Scandium high strength aluminum alloy with excellent castability, characterized in that 0.05 to 0.2% by weight and the remainder is composed of aluminum (Al), aged for 24 hours at a temperature of 120 ℃.
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