KR20010058922A - Aluminum alloy for diesel engine - Google Patents
Aluminum alloy for diesel engine Download PDFInfo
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- KR20010058922A KR20010058922A KR1019990066298A KR19990066298A KR20010058922A KR 20010058922 A KR20010058922 A KR 20010058922A KR 1019990066298 A KR1019990066298 A KR 1019990066298A KR 19990066298 A KR19990066298 A KR 19990066298A KR 20010058922 A KR20010058922 A KR 20010058922A
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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
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0408—Light metal alloys
- C22C1/0416—Aluminium-based alloys
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Abstract
Description
본 발명은 디젤 엔진용 알루미늄 합금강에 관한 것으로서, 더욱 상세하게는 구리, 규소, 마그네슘, 아연, 철, 망간, 주석, 납, 및 알루미늄을 함유시켜 디젤 엔진용 알루미늄 합금강을 제조함으로써, 종래 알루미늄 합금강의 내열 피로성을 증가시켜 고온 및 고압에 견딜 수 있는 디젤 엔진용 알루미늄 합금강에 관한 것이다.The present invention relates to an aluminum alloy steel for a diesel engine, and more particularly, to produce an aluminum alloy steel for a diesel engine containing copper, silicon, magnesium, zinc, iron, manganese, tin, lead, and aluminum, The present invention relates to an aluminum alloy steel for a diesel engine capable of withstanding high temperature and high pressure by increasing thermal fatigue resistance.
일반적으로 알루미늄 합금강 재질을 선정하는 기준은 주로 강도 내열성, 내충격성 및 주조성을 고려하여 선정된다. 일반적인 합금강 재질은 JIS 기준으로 AC2B, AC4B, AC4D, 및 AC4C 재질로서 강도 또는 신율이 우수한 재질이 추천되거나 또는 이러한 합금강재질을 약간 조정하여 사용하기도 한다. 그 중 내열 피로성 및 강도가 우수한 AC4C는 알루미늄을 주성분으로 하고, 구리 0.25 중량% 미만, 규소 6.5 ∼ 7.5 중량%, 마그네슘 0.25 ∼ 0.45 중량%, 아연 0.35 중량%미만, 철 0.55 중량% 미만, 망간 0.35 중량% 미만, 주석 0.05중량% 미만, 납 0.1 중량% 미만, 및 크롬, 니켈, 나트륨, 및 칼슘의 화합물 0.05 중량% 미만 함유된 조성을 가진다.In general, the criteria for selecting aluminum alloy steel materials are mainly selected in consideration of strength heat resistance, impact resistance and castability. General alloy steel materials are AC2B, AC4B, AC4D, and AC4C based on JIS standards, and materials having high strength or elongation are recommended, or these alloy steel materials may be slightly adjusted. Among them, AC4C, which has excellent thermal fatigue resistance and strength, has aluminum as its main component, less than 0.25 wt% of copper, 6.5 to 7.5 wt% of silicon, 0.25 to 0.45 wt% of magnesium, less than 0.35 wt% of zinc, less than 0.55 wt% of iron, and 0.35 of manganese. Less than 0.05% tin, less than 0.05% tin, less than 0.1% lead, and less than 0.05% by weight of the compounds of chromium, nickel, sodium, and calcium.
최근에는 디젤 엔진이 기존 간접 분사식에서 직접 분사식으로 바뀌는 추세이고, 이러한 직접 분사식의 디젤 엔진의 경우, 내구 조건이 가혹하여 고온 및 고압에 견딜 수 있는 새로운 합금강 재질이 요구되고 있다. 특히 기존 JIS 재질 중 AC4CH 또는 AC4C 재질의 우수한 신율로 인하여 디젤 엔진용 합금강 재질로 많이 사용되고 있으나, 강도면에서는 AC2B 또는 AC4B 재질보다 약하기 때문에 이에 대한 개선이 필요하다고 볼 수 있다.Recently, the diesel engine has been changed from the direct indirect injection type to the direct injection type. In the case of such a direct injection type diesel engine, a new alloy steel material capable of withstanding high temperature and high pressure is required due to severe endurance conditions. In particular, due to the excellent elongation of the existing JIS materials AC4CH or AC4C material is used a lot of alloy steel for diesel engines, but in terms of strength is weaker than the AC2B or AC4B material can be considered to be improved.
또한, 상기 기존 합금강의 내열 피로성은 고온 강도, 신율이 클수록 중요한 인자로 작용하기 때문에, 현재 이에 가장 근접한 합금강으로써 AC4CH(Al- 7.0% Si-0.35% Mg 계) 재질이 많이 사용되고 있으나, 이러한 재질 또한 250℃ 정도에서 내열성 및 내충격성이 급격하게 저하되어 내구성이 하락된다.In addition, since the thermal fatigue resistance of the existing alloy steel is an important factor as the high temperature strength and elongation increases, AC4CH (Al-7.0% Si-0.35% Mg-based) material is widely used as the alloy steel closest to it, but such a material is also used. At about 250 ° C., heat resistance and impact resistance are drastically lowered, thereby deteriorating durability.
따라서, 기존의 재질보다 우수한 내열 피로성, 고온 강도, 및 신율을 얻을 수 있는 새로운 합금강 설계가 필요하다.Therefore, there is a need for a new alloy steel design that can achieve better thermal fatigue resistance, higher temperature strength, and elongation than existing materials.
이에, 본 발명에서는 상기의 문제점을 개선하기 위하여 알루미늄을 주성분으로 구리, 규소, 마그네슘, 아연, 철, 망간, 주석, 납, 및 크롬, 니켈, 나트륨, 및 칼슘이 함유된 화합물을 함유시킴으로 우수한 내열 피로성, 내충격성 및 신율을 가진 디젤 엔진용 알루미늄 합금강을 제공하는데 그 목적이 있다.In the present invention, in order to improve the above problems, aluminum, copper, silicon, magnesium, zinc, iron, manganese, tin, lead, and chromium, nickel, sodium, and calcium containing compounds containing excellent heat resistance The object is to provide aluminum alloy steel for diesel engines with fatigue, impact resistance and elongation.
본 발명은 디젤 엔진용 알루미늄 합금강에 있어서, 알루미늄을 주성분으로 하고, 구리 0.80 ∼ 1.20 중량%, 규소 6.5 ∼ 7.5 중량%, 마그네슘 0.35 ∼ 0.45 중량%, 아연 0.10 중량%미만, 철 0.20 중량% 미만, 망간 0.10 중량% 미만, 주석 0.05 중량% 미만, 납 0.1 중량% 미만, 그리고 크롬, 니켈, 나트륨, 및 칼슘 중에서 선택된 금속이 함유된 금속 화합물 0.05 중량% 미만이 함유되어 있는 디젤 엔진용 알루미늄 합금강을 그 특징으로 하고 있다.The present invention is an aluminum alloy steel for a diesel engine, comprising aluminum as a main component, 0.80 to 1.20 wt% copper, 6.5 to 7.5 wt% silicon, 0.35 to 0.45 wt% magnesium, less than 0.10 wt% zinc, less than 0.20 wt% iron, Aluminum alloy steel for diesel engines containing less than 0.10% manganese, less than 0.05% tin, less than 0.1% lead, and less than 0.05% by weight of a metal compound containing a metal selected from chromium, nickel, sodium, and calcium. It features.
이와 같은 본 발명을 더욱 상세히 설명하면 다음과 같다.Referring to the present invention in more detail as follows.
본 발명은 종래의 디젤 엔진용 알루미늄 합금강 조성의 함량을 변화시킴으로써, 고온에서의 내열 피로성, 내충격성 및 내구성을 향상시킨 디젤 엔진용 알루미늄 합금강에 관한 것이다.The present invention relates to an aluminum alloy steel for a diesel engine which improves heat fatigue resistance, impact resistance and durability at high temperatures by changing the content of a conventional aluminum alloy steel composition for a diesel engine.
본 발명에서 알루미늄을 주성분으로 하고, 고온에서의 내열 피로성 문제점을 개선하기 위하여 각 합금강 원소의 조성 범위를 설정한다.In the present invention, aluminum is the main component, and the composition range of each alloy steel element is set in order to improve the problem of thermal fatigue resistance at high temperature.
먼저 본 발명에서 사용하는 구리는 알루미늄 합금강의 제조시 주조성 향상을 위하여 첨가된다. 순수 알루미늄은 유동성이 적고 수축율이 많고, 가스의 흡수 발산이 많아 주조가 곤란하다. 본 발명에서 구리의 함량은 전체 알루미늄 합금강에 대하여 0.80 ∼ 1.20 중량% 첨가된다. 만일 구리의 함량이 0.8 중량% 미만이면 주조성이 불량해지며 강도가 저하되고, 1.20 중량% 초과되면 열전도도 저하 및 주조시 열간 취성이 발생되어 바람직하지 못하게 된다.First, copper used in the present invention is added to improve castability in the production of aluminum alloy steel. Pure aluminum is difficult to cast due to its low fluidity, high shrinkage, and high gas absorption and divergence. In the present invention, the copper content is added 0.80 to 1.20% by weight based on the total aluminum alloy steel. If the copper content is less than 0.8% by weight, the castability is poor and the strength is lowered. If the copper content is more than 1.20% by weight, the thermal conductivity is lowered and hot brittleness occurs during casting, which is undesirable.
본 발명에서 사용하는 규소는 탈산제로서 입계 산화층의 형성을 방지하기 위하여 첨가된다. 본 발명에서 규소의 함량은 전체 알루미늄 합금강에 대하여 6.5 ∼ 7.5 중량% 첨가된다. 만일 규소의 함량이 6.5 중량% 미만이면 편석을 만드는 경향이 있고 주조 불량이 나타나고, 7.5 중량% 초과되면 강도가 저하되고, 내열 피로성에 중요한 영향을 미치는 열전도도 및 열확산 계수가 저하되어 바람직하지 못하다.Silicon used in the present invention is added as a deoxidizer to prevent the formation of grain boundary oxide layers. In the present invention, the content of silicon is added 6.5 to 7.5% by weight based on the total aluminum alloy steel. If the silicon content is less than 6.5% by weight, it tends to make segregation, casting defects appear, and if it exceeds 7.5% by weight, the strength is lowered, and the thermal conductivity and thermal diffusion coefficient which have a significant influence on the thermal fatigue resistance are undesirable.
본 발명에서 사용하는 마그네슘은 알루미늄이 물이나 산에 의해 부식되는 것을 막고 고온 강도를 증가시키기 위하여 첨가된다. 본 발명에서 마그네슘의 함량은 전체 알루미늄 합금강에 대하여 0.35 ∼ 0.45 중량% 첨가된다. 만일 마그네슘의 함량이 0.35 중량% 미만이면 강도가 저하되고, 0.45 중량% 초과되면 열전도도 감소 및 주물에 산화물 형성이 많아 주조 품질이 저하되고, 열처리에 의해 신율 저하가 발생되어 바람직하지 못하다.Magnesium used in the present invention is added to prevent aluminum from being corroded by water or acid and to increase the high temperature strength. In the present invention, the magnesium content is added 0.35 to 0.45% by weight based on the total aluminum alloy steel. If the magnesium content is less than 0.35% by weight, the strength is lowered. If the content of magnesium is more than 0.45% by weight, the thermal conductivity decreases and the oxide is formed in the casting, so that casting quality is lowered and elongation is lowered by heat treatment.
본 발명에서 사용하는 아연은 주조성을 향상시키고, 내식성을 증가시키기 위하여 첨가된다. 본 발명에서 아연의 함량은 0.10 중량% 미만으로 제한하는 것이 바람직하다. 만일 아연의 함량이 0.1 중량% 초과되면 열전도도 감소 및 내식성이 저하되고, 열간 크랙이 발생하여 취성 발생이 커지게 되어 바람직하지 못하다.Zinc used in the present invention is added to improve castability and to increase corrosion resistance. In the present invention, the content of zinc is preferably limited to less than 0.10% by weight. If the content of zinc is more than 0.1% by weight, the thermal conductivity is reduced and the corrosion resistance is lowered, hot cracks are generated, the occurrence of brittleness is undesirably large.
본 발명에서 사용하는 철의 함량은 전체 알루미늄 합금강에 대하여 0.20 중량% 미만으로 제한하는 것이 바람직하다. 만일 철의 함량이 0.2 중량% 초과되면 열전도도 저하 및 과도한 취성 화합물의 생성으로 내열 피로강도에 치명적인 손상 초래하여 바람직하지 못하다.The content of iron used in the present invention is preferably limited to less than 0.20% by weight based on the total aluminum alloy steel. If the iron content is more than 0.2% by weight, the thermal conductivity is lowered and excessive brittle compounds are produced, which causes fatal damage to the thermal fatigue strength, which is undesirable.
본 발명에서 사용하는 망간은 알루미늄 합금강 내 존재하는 철 원소와 결합하여 침상 화합물(Al-Fe-Si계)을 괴상 화합물(Al-Fe-Si-Mn 계)로 변경시킴으로써 열 피로에 의한 크랙 방지 효과를 위하여 첨가된다. 본 발명에서의 망간의 함량은 전체 알루미늄 합금강에 대하여 0.10 중량% 미만으로 첨가하는 것이 바람직하다. 만일 망간의 함량이 0.1 중량% 초과되면 열전도도가 저하되고, 입계산화층을 형성함에 따라 강도가 저하되어 바람직하지 못하다.Manganese used in the present invention is combined with iron elements present in aluminum alloy steel to change the acicular compound (Al-Fe-Si type) to a bulk compound (Al-Fe-Si-Mn type) to prevent cracking effect due to thermal fatigue Is added for. The content of manganese in the present invention is preferably added in less than 0.10% by weight based on the total aluminum alloy steel. If the content of manganese exceeds 0.1% by weight, the thermal conductivity is lowered, and the strength is lowered as the grain boundary oxide layer is formed, which is not preferable.
이 밖에도, 본 발명의 알루미늄 합금강에는 통상의 함량에서와 같이 주석 0.05 중량% 미만, 납 0.1 중량% 미만, 그리고 크롬, 니켈, 나트륨, 및 칼슘이 함유된 화합물 0.05 중량% 미만을 함유시킨다.In addition, the aluminum alloy steel of the present invention contains less than 0.05% by weight of tin, less than 0.1% by weight of lead, and less than 0.05% by weight of a compound containing chromium, nickel, sodium, and calcium, as usual.
이상과 같은 조성과 함량으로 알루미늄 합금강의 함량을 조절함으로써, 내열 피로성과 강성 및 신율이 증가된 디젤 엔진용 알루미늄 합금강을 얻을 수 있다.By adjusting the content of the aluminum alloy steel in the composition and content as described above, it is possible to obtain an aluminum alloy steel for diesel engine with increased heat fatigue fatigue resistance, rigidity and elongation.
이하, 본 발명을 실시예에 의거 더욱 상세히 설명하겠는 바, 본 발명이 실시예에 의해 한정되는 것은 아니다.Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by Examples.
실시예 및 비교예Examples and Comparative Examples
다음 표 1에 나타낸 바와 같은 함량과 조성으로 통상적인 방법에 따라 디젤 엔진용 알루미늄 합금강을 제조하였고, 비교예로는 기존의 JIS 기준 AC4C 합금강을 사용하였다.Next, the aluminum alloy steel for the diesel engine was manufactured according to a conventional method with the content and composition as shown in Table 1, and a conventional JIS standard AC4C alloy steel was used as a comparative example.
그리고 상기 실시예 및 비교예에서 제조한 디젤 엔진용 알루미늄 합금강에 대하여 내열 피로성을 다음의 조건에 의거하여 측정하고, 그 결과를 표 1에 나타내었다.The thermal fatigue resistance of the aluminum alloy steel for the diesel engine manufactured in Examples and Comparative Examples was measured based on the following conditions, and the results are shown in Table 1 below.
- 테스트 조건- test requirements
스트레인(strain) : 0.55%Strain: 0.55%
온도구간 : 50 ∼ 250℃Temperature range: 50 ~ 250 ℃
싸이클 시간(cycle time) : 5분(300초)Cycle time: 5 minutes (300 seconds)
상기 표 1의 결과에서 보면, 본 발명의 조성과 함량이 포함된 디젤 엔진용 알루미늄 합금강은 종래의 합금강인 AC4C에 비해 내열 피로성이 약 57% 증가함을알 수 있다.In the results of Table 1, it can be seen that the aluminum alloy steel for the diesel engine containing the composition and content of the present invention has an increased thermal fatigue resistance of about 57% compared to the conventional alloy steel AC4C.
상술한 바와 같이 본 발명에 따른 디젤 엔진용 알루미늄 합금강은 종래의 알루미늄 합금강에 비해 내열 피로성이 우수하고, 나아가 고온 강도, 신율 및 내구성 향상에 효과가 있음을 알 수 있다.As described above, it can be seen that the aluminum alloy steel for the diesel engine according to the present invention has excellent thermal fatigue resistance and further improves high temperature strength, elongation and durability compared to conventional aluminum alloy steel.
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KR20200065390A (en) | 2018-11-30 | 2020-06-09 | 한국생산기술연구원 | A method for manufacuring high strength aluminium alloy |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US4714588A (en) * | 1983-12-22 | 1987-12-22 | Aluminum Company Of America | Aluminum alloy having improved properties |
JPH10204566A (en) * | 1997-01-14 | 1998-08-04 | Sumitomo Light Metal Ind Ltd | Aluminum alloy material excellent in anodic oxidation treatment property and having high strength and wear resistance, and its production |
KR20000019339A (en) * | 1998-09-10 | 2000-04-06 | 류정열 | Improved material of heat-resisting characteristic of cylinder head |
-
1999
- 1999-12-30 KR KR1019990066298A patent/KR20010058922A/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4714588A (en) * | 1983-12-22 | 1987-12-22 | Aluminum Company Of America | Aluminum alloy having improved properties |
JPH10204566A (en) * | 1997-01-14 | 1998-08-04 | Sumitomo Light Metal Ind Ltd | Aluminum alloy material excellent in anodic oxidation treatment property and having high strength and wear resistance, and its production |
KR20000019339A (en) * | 1998-09-10 | 2000-04-06 | 류정열 | Improved material of heat-resisting characteristic of cylinder head |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20200065390A (en) | 2018-11-30 | 2020-06-09 | 한국생산기술연구원 | A method for manufacuring high strength aluminium alloy |
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