http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
자동차 차체재료용 Al-Mg-Si-(Cr,Be) 합금의 기계적 성질에 관한 연구
우기도(Kee Do Woo),이종수(Jong Soo Lee),이민상(Min Sang Lee),김석원(Sug Won Kim) 한국주조공학회 1999 한국주조공학회지 Vol.19 No.2
N/A Al-Mg-Si alloys have good strength, formability, corrosion resistance, and bake hardenability. But there is a weak point to use for the auto body materials. This is because the strength of this alloy was decreased by the precipitation of G.P.I zone formed at room temperature for a long holding time. In practical usage, it is inevitable to hold at room temperature prior to paint baking. The present work is aimed to improve bake hardenability using special heat treatments such as two step aging, and retrogressing and reaging(RRA) in Al-Mg-Si-(Cr, Be) alloys. A differencial scanning calorimeter and tensile test were employed to investigate the precipitation behaviors and the mechanical properties in Al-Mg-Si alloys. The tensile strength of Al-Mg-Si-Be and Al-Mg-Si-Cr-Be alloys were improved by special heat treatments such as two step aging and RRA treatment after pre-aged at 120 and 150˚C for 4 hrs. The combination between strength and ductility of the Cr, Be containing Al-Mg-Si alloy is better than those of no addition of Cr,Be in Al-Mg-Si alloy. (Received February 2,1999)
Al-Cu-Li-X (In , Be) 합금의 조직과 기계적 성질의 상호관계
이승호,이종수,김석원,우기도 ( Sung Ho Lee,Jong Soo Lee,Suk Won Kim,Kee Do Woo ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.4
N/A The effects of In and Be additions on the aging behaviors and mechanical properties in the Al-Cu-Li alloy were investigated using the transmission electron microscope, the scanning electron microscope, hardness and tensile strength measurement. The aging is promoted and the double hardness peak is appeared by the addition of In and Be in the Al-Cu-Li alloy. The strength is increased, but the elongation and toughness are decreased by the addition of In in the Al-Cu-Li alloy. And the Al-Cu-Li-In-Be alloy has good combination with the strength, the elogation and toughness than Al-Cu-Li-In alloy.
자동차 차체재료용 Al-Mg-Si-(Be) 합금의 도장소부경화성 개선에 관한 연구
이종수,김동건,김석원,우기도 ( Jong Soo Lee,Dong Keon Kim,Sug Won Kim,Kee Do Woo ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.2
N/A Al-Mg-Si system alloys are capable of providing a good combination of formability and paint bake hardening response. For this reason, they have been proved suitable for automotive panel parts. The pre-aging treatment for prohibition of G.P. I zone formation is needed to increase the bake hardening of the Al-Mg-Si alloys. This is because G.P.I zone formed by natural aging decreases the effect of bake hardening. Be elements are known to increase the strength and to improve the bake hardening in Al-Mg-Si system alloys, respectively. Therefore the strength and bake hardening will be affected by the addition of Be in Al-Mg-Si alloy. In this paper, the effects of Be addition, two-step aging, and retrogression and re-aging (RRA) treatment on the bake hardening in Al-Mg-Si alloys will be investigated by hardness, tensile test, and differential scanning calorimetry. The rate of β` formation in the Al-Mg-Si alloy was significantly accelerated by the small addition of Be. By the. addition of Be in Al-Mg-Si alloy, G.P.I zone easily decomposes during retrogression treatment at 225˚C for 3 minutes. The hardness of Al-Mg-Si-(Be) alloy were increased by RRA (150˚C/20 min → 225/3 min → 180˚C/30 min) treatment. (Received February 17, 1998)
Cr 과 Be 을 복합 첨가한 자동차 차체재료용 Al-Mg-Si 합금의 도장소부경화성 개선에 관한 연구
이종수,우기도,김석원 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.9
Al-Mg-Si system alloys are capable of providing a good combination of formability and paint bake response. which has favored with automotive panel applications. Be is a useful element to improve the bake hardenability in Al-Mg-Si alloy. Two step aging and RRA(retrogression and reaging) are very useful to increase the bake hardenability in Al-Mg-Si system alloys. Cr is also known to increase strength and the bake hardenability in Al-Mg-Si system alloys. In this paper, the effects of Be and Cr addition, two-step aging and RRA treatment on the bake hardenability in Al-Mg-Si-Be-Cr alloys are investigated by hardness, tensile test, and differential scanning calorimetry. Age hardening is accelerated and bake hardening is ameliorated by the addition of Be and Cr in Al-Mg-Si alloy. The bake hardening is improved by preaged at 60℃ and 150℃ followed by baked at 180℃ for 30 minutes in Al-Mg-Si-Be-Cr alloy rather than Al-Mg-Si alloy. And the bake hardening is also improved by RRA(150℃/20min→225℃/3min→180℃/30min) treatment in Al-Mg-Si and Al-Mg-Si-Be-Cr alloys.
자동차 차체재료용 Al-Mg-Si 합금의 성형성에 미치는 첨가원소와 2 단 시효처리의 영향
이종수,우기도,황인오 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.12
The purpose of this study is to develop an Al-0.8%Mg-1.0%Si alloy that combined bake hardenability and formability. A differential scanning calorimeter, transmission electron microscope, tensile test and Erichsen test were employed to investigate bake hardenability and formability of Al-Mg-Si alloys. A new Cr and Be addition Al-Mg-Si alloy which combined bake hardenability and formability has been developed. The bake hardenability and formability of Al-0.8%Mg-1.0%Si was improved by the two step aging treatment(120℃/4hrs→180℃/0.5hrs), and by the complex addition of the 0.1%Cr and 0.057%Be elements. Erichsen value of Al-Mg-Si-Cr-Be alloy is similar to that of Al-Mg-Si alloys, but the strength of Al-Mg-Si-Cr-Be alloy is higher than that of Al-Mg-Si alloys in two step aging treatment(120℃/4hrs→180℃/0.5hrs).