• Title/Summary/Keyword: AC4C Alloy

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Static and Dynamic Characteristics of AC4C Aluminum Alloy (AC4C 알루미늄 합금의 정적 및 동적 특성)

  • Kwon, Y.G.;Ju, W.K.;Song, J.I.
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.220-225
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    • 2007
  • The mechanical characteristics of AC4C Aluminum Casting Alloy were investigated by tensile test and impact test. Based on the tensile test' s result, we found that the yield strength of a high speed was about 10% higher than that of a low speed test and the maximum rupture strain mostly occurred in low speed tensile test. The impact energy of curved surface specimen was higher than that of plane surface specimen that can be measured in impact test.

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The Effect of Casting Condition and Heat Treatment on the Mechanical Properties of AC4C Alloy Castings (AC4C 합금의 기계적 성질에 미치는 주조조건과 열처리의 영향에 관한 연구)

  • Kang, Hyo-Gyoung;Cheon, Byung-Wook;Choi, Chang-Ock
    • Journal of Korea Foundry Society
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    • v.13 no.5
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    • pp.450-461
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    • 1993
  • AC4C alloy casts in the metallic mold, zircon sand mold, silica sand mold and shell mold with the pouring temperatures of 680, 710 and $740^{\circ}C$ have been investigated. The tensile strength, elongation and hardness of AC4C alloy castings have been influenced by the kind of molds used. The mechanical properties in zircon sand mold castings were greater than those in other sand mold castings, but were inferior to the properties in metallic mold castings. Eutectic Si particle size and DAS were increased in the order of metallic mold, ziron sand mold, silica sand mold and shell mold. Also, they were increased with the increase of pouring temperatures. DAS, eutectic Si particle size and grain size decreased with the increase of mechanical properties as the cooling rate increased. The eutectic Si particle size and DAS of AC4C alloy castings after T6 treatment were decreased in as-cast. The variation of eutectic Si particle size has been effected on the tensile strength, elongation and fractured surface.

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A Study on the Preparation and Wear Characteristics of TiC Hardfaced Layers on Aluminium alloy by PTA Method (PTA법에 의한 TiC 분말 표면강화 AL 합금층의 제조 및 마모특성에 관한 연구)

  • 민준원;유승을
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.9
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    • pp.138-145
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    • 1999
  • Surface hardening of AC4C aluminium alloy with TiC powders was obtained by plasma transferred are (PTA) method, Bead appearance, microstrucutre and wear behavior were characterized in relation to the torch current, powder feed rate and wear condition. The width and the depth of bead were mainly increased with increasing torch current. The comparison of wear behavior between AC4C alloy and PTA treated AC4C alloy showed the remarkable enhancement of wear resistance.

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A Study on the Development for the Vehicle Engine Mountion Bracket Using Squeeze Casting (스퀴즈 캐스팅 제조법에 의한 자동차 엔진 마운틴 브래킷 개발에 관한 연구)

  • Kim, S.H.
    • Journal of Power System Engineering
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    • v.7 no.4
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    • pp.44-48
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    • 2003
  • Alumium alloys casting are gaining increased acceptance in the automotive and electronic industeries and squeeze casting is the most efficient method of manufacturing such mass produced parts. This study has been investigated the microstructures and mechanical properties of Al-7.0Si-0.4Mg(AC4C)alloy fabricated by squeeze casting process for development of Engine Mountain Bracket. The microstructure of squeeze casted specimen were composed of eutectic structure Alumimim solid solution and $Mg_2Si$ precipitates. The tensile strength of as-solid solution treatment Al-7.0Si-0.4Mg alloy revealed 2985MPa. It was found that Al-7.0Si-0.4Mg alloy have good aging hardening effect results are presented to show the validity of the control method.

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Cyclic Stress-strain Hardening Model of AC4C-T6 Alloy at Cryogenic Temperature (극저온 상태에서 AC4C-T6 의 가공 경화 모델 결정에 관한 연구)

  • Lee, Jae-Beom;Kim, Kyung-Su;Lee, Jang-Hyun;Yoo, Mi-Ji;Choung, Joon-Mo
    • Journal of the Society of Naval Architects of Korea
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    • v.46 no.5
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    • pp.498-509
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    • 2009
  • Present study is concerned with the simulation of plasticity models for the cyclic stressstrain behavior of aluminum alloy AC4C-T6 that can be used for primary materials of LNG cargo pump. Material model of cyclic hardening and plasticity for aluminum alloy AC4C-T6 was investigated through experiments and numerical simulations. Monotonic tensile and cyclic tension-compression test under symmetric load cycles was performed at both room temperature and cryogenic temperature of $-165^{\circ}C$. Based on the experimental data plastic hardening models were evaluated for isotropic/kinematic/combined hardening. FEA (Finite Element Analysis) models which describe the cyclic stress-strain relationship were evaluated for the simulation of plasticity. An appropriate hardening model is proposed comparing the results of FEA with those of experiments.

Fabrication of ACtA/$SiC_w$ composite by squeeze casting (I) (용탕 단조법에 의한 AC4A/Si$C_w$복합재료 제조에 관한 연구 (I))

  • Moon, Kyung-Cheol;Lee, Jun-Hee
    • Korean Journal of Materials Research
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    • v.2 no.6
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    • pp.461-467
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    • 1992
  • A fabrication process for SiC whisker preform reinforced AC4A Al composites is being developed. The Al alloy used as the matrix in this study is AC4A. SiC whisker preform made by Tokai Carbon Co. Ltd. Shizuoka, Japan were used. These consisted of $\beta$-type single crystals 0.1 ~ 10${\mu}$m in diameter and 20~10${\mu}$m in length. The most adequate fabrication condition was that whisker preform was preheated up to 750~80$0^{\circ}C$, set into a mould preheated to ~40$0^{\circ}C$, molten Al alloy heated to ~80$0^{\circ}C$ and applied pressure 75MPa. And Si$C_w$reinforced AC4A composite was advanced above twice than AC4AI/M. Also it was not large effect by pressure at Si$C_w$ 20v/o.

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A Study on the Squeeze Casting of Al-7.0Si-0.4Mg Alloy for Fuel System Parts (Al-7.0Si-0.4Mg 합금 자동차 연료계 부품의 스퀴즈 캐스팅에 관한 연구)

  • 김순호
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.12
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    • pp.48-54
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    • 2003
  • Alumium alloys casting are gaining increased acceptance in the automotive and electronic industeries and squeeze casting is the most efficient method of manufacturing such mass produced parts. This study has been investigated the microstructures and mechanical properties of Al-7.0Si-0.4Mg (AC4C) alloy fabricated by squeeze casting process for development of Fuel system Parts (Fuel rail). The microstructure of squeeze casted specimen were composed of eutectic structure Alumimim solid solution and $Mg_2$Si precipitates. The tensile strength of as-solid solution treatment Al-7.0Si-0.4Mg ahoy revealed 298.5MPa. It was found that Al-7.0Si-0.4Mg alloy have good corrosion resistance in electrochemical polarization test.

Numerical Study on Thermal Deformation of AC4C and AC7A Casting Material (AC4C와 AC7A 주조재의 열변형 수치해석적 연구)

  • Yoon, Hee-Sung;Oh, Yool-Kwon
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.20 no.5
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    • pp.541-546
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    • 2011
  • This study was numerically investigated on thermal deformation of AC4C and AC7A aluminum alloy casting material for manufacturing the automobile tire mold. The metal casting device was used in order to manufacture the mold product of automobile tire at the actual industrial field. The temperature distribution and the cooling time of these materials were numerically calculated by finite element analysis. Thermal deformation with stress distribution was also calculated form the temperature distribution results. The thermal deformation was closely related to the temperature difference between the surface and inside of the casting. As shown by numerical analysis result, the thermal deformation of AC7A casting material became higher than AC4C casting material. In addition, the results of displacement and stress distributions appeared to be larger at the center parts of casting than on its sides because of the shrinkage caused by the cooling speed difference.

Effects of Process and Casting Variables on the Results of Degassing AC4C Aluminum Alloy Melt by Using Rotary Degasser (공정 및 주조 변수의 AC4C 알루미늄 합금 용탕의 로터리 degasser를 이용한 탈가스 처리 결과에 미치는 영향)

  • Lee, Ki-Joon;Kwon, Hae-Wook
    • Journal of Korea Foundry Society
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    • v.20 no.6
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    • pp.407-418
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    • 2000
  • The effect of various factors on the results of degassing of AC4C aluminum alloy melt by using rotary degasser were investigated. The difference between the effects of nitrogen gases of commercial pure and high purity grades on the degassing results was not significant. The optimum degassing condition was obtained. The effect of holding and degassing temperature was not significant, either. The result of degassing was deteriorated by the modification treatment of eutectic silicon, meanwhile improved by the grain refining. The effect of the latter was stronger than that of the former when the melt was treated simultaneously. The volume fractions of hydrogen porosity of the castings obtained from the molds with water moisture such as natural and green sand molds were much higher than those from the molds without that such as pep-set and $CO_2$ molds.

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The Optimal Solution Treatment Condition in a Al-Si-Cu AC2B Alloy (Al-Si-Cu계 AC2B 합금의 최적 용체화 처리 조건)

  • Jung, Jae-Gil;Park, June-Soo;Ha, Yang-Soo;Lee, Young-Kook;Jun, Joong-Hwan;Kang, Hee-Sam;Lim, Jong-Dae
    • Korean Journal of Metals and Materials
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    • v.47 no.4
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    • pp.223-227
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    • 2009
  • The precipitates, hardness, and tensile properties of Al-6.2Si-2.9Cu AC2B alloy were investigated with respect to solution treatment time at $500^{\circ}C$. $Al(Cu)-Al_2Cu$ eutectic, Si, ${\theta}-(Al_2Cu)$, and $Q-(Al_5Cu_2Mg_8Si_6)$ phases were observed in the as-cast specimen. With increasing the solution treatment time at $500^{\circ}C$, the $Al(Cu)-Al_2Cu$ eutectic and ${\theta}-(Al_2Cu)$ phases were gradually reduced and finally almost disappeared in 5 h. The mechanical properties, such as hardness, tensile strength, and elongation, were improved with solution treatment time until about 5 h due to the dissolution of the $Al_2Cu$ particles. With further holding time, the mechanical properties did not change much. The solution treated specimens for over 5 h at $500^{\circ}C$ exhibit almost the same tensile properties even after aging at $250^{\circ}C$ for 3.5 h. Accordingly, the optimal solution treatment condition of the Al-Si-Cu AC2B alloy is considered to be 5 h at $500^{\circ}C$.