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엔진 마운트 브라켓용 다이캐스팅 Al-Si-Cu 합금의 미세조직과기계적 특성
천인범 ( In Bum Chyun ),홍승표 ( Seung Pyo Hong ),김정석 ( Chung Seok Kim ) 한국열처리공학회 2014 熱處理工學會誌 Vol.27 No.6
Microstructural and mechanical characteristics of Al-6Si-2Cu alloy for engine mount bracket prepared by gravity casting (as-cast) and die-casting (as-diecast) process have been investigated. For the microstructural characterization, the inductively coupled plasma mass spectrometry (ICP-MS), optical microscope (OM), scanning electron microscope (SEM) and electron probe microanalysis (EPMA) analyses are conducted. For the inter-metallic phases, the X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) are also conducted with quantitative and qualitative analysis. Micro Vickers hardness and static tensile test are achieved in order to measure mechanical properties of alloys. Secondary dendrite arm spacing (SDAS) of as-cast and as-die cast show37um and 18um, respectively. A large amount of coarsen eutectic Si, Al2Cu inter metallic phase and Fe-richphases are identified in the Al-6Si-2Cu alloy. Mechanical properties of gravity casting alloy are much higher than those of die-casting alloy. Especially, yield strength and elongation of gravity casting alloy show 2 times higher than die-casting alloy. After shot peening, shot peening refined the surface grains and Si particles of the alloys by plastic deformation. The surface hardness value shows that shot peening alloy has higher value than unpeening alloy.
유영선(Yeong seon Yu),이민근(Min geun Lee),천인범(In Bum Chyun),조규종(Kyu zong Cho) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, in order to overcome this problem, new types of systems which can vary the suspension characteristics according to the driving and road conditions have been being developed. The Adaptive, Active and Semi-Active electronic controlled suspension systems are some of examples of these development. In addition, various types of other alternative systems are also being constantly studied and developed at present.