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이우식(W.S.Lee),강동포(D.P.Kang),권태우(T.W.Kwon),김대업(D.U.Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Weldability of carbon steel was influenced on the carbon composition and welding condition. In this study, weldability was investigated by microstructure, hardness, fatigue test of heat treated carbon steel S35C, S45C and untempered steel KF40CV. Although it used to the same welding wire, the different hardness was revealed by the amount of carbon content in the specimen. As the test point came close to HAZ region from the substrate, the hardness was shown the peak value. The bigger hardness gap in HAZ region, the lower value of fatigue limit at 10? cycle in the fatigue test.
이우식(W.S.Lee),권태우(T.W.kwon),조열래(Y.R.Cho),김대업(D.U.Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The application of high strength steel contribute to mass efficiency with excel lent performance. In this study light weight reduction of automotive chassis parts by application of hot rolled 590 Mpa grade dual phase steel which was newly· developed was performed. The formability in stamping was revealed on the equivalent grade by relative high work-hardening coefficient. Furthermore, according to similar contents of carbon element between mass productive steel and this developed steel, those welding and painting behavior were shown good performance. For checking the durability of the automotive parts adopted the developed steel, various test were carried out, and the result was compatible with the present mass production parts.
강동포(D.P.Kang),이우식(W.S.Lee),이규현(K.H.Lee),김대업(D.U.Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Although extruded aluminium bumper beam has been commonly used in advanced car makers, there are not so much precedent for it's localization. For the localization of aluminum bumper beam of 7XXX series, benchmarking, material modifications of 7XXX series aluminum alloy, section design of beam, impact analysis had been performed in this study. High fuel efficiency and weight reduction could be achieved by using aluminum bumper beam of which the weight is lighter than that of steel. Moreover, it is expected to reach higher recycling rate by substituting aluminum for steel.