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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.
Giga급 강재를 활용한 자동차 차체 컨셉 및 경량부품 개발
김홍기(H.G. Kim),최한호(H.H. Choi),임지호(J.H. Lim),조열래(Y.R. Cho),유병주(B.J. Yoo) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Concept of steel intensive light weight BIW composed by giga tensile strength grades of TWIP, DP and HPF(hot press forming) materials was developed. Vehicle’s weight was reduced as much of 20% compared with the bench marking vehicle of 223.8㎏, and it showed good performance of collision and roof crush as well NVH. And weight reduced automotive parts that construct the concept were developed by adoption of various forming method such as hydroforming, stamping and hot press forming method.
Ferrite-Pearlite 열연강판의 피로특성에 미치는 강화기구의 영향
박기종,정진환,조열래 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.3
High cycle and low cycle fatigue properties of high strength hot-rolled steel sheets have been studied with respect to their tensile strength and strengthening mechanisms. Fully reversed low cycle fatigue test has been conducted at a rate of 6x10^(-3)s^(-1). Specimen for monotonic tensile tests and cyclic fatigue tests have been obtained from the topend of hot-rolled coils. Fatigue strength is increased with the increase in tensile strength up to 60㎏/㎟, then it is gradually leveled off above 70㎏/㎟. The C-Mn steel with low yield ratio shows lower fatigue strength ratio than Nb containing precipitation hardened steel with high yield ratio. The extent of cyclic softening in the C-Mn-Nb steels is higher than that of the C-Mn steels. This could be qualitatively interpreted by the low plastic strain amplitude formed during the cyclic deformation. The softening and the associated planar dislocations configuration could be qualitatively interpreted by assuming the existence of precipitation strengthening by interstitial atoms and the breakdown of the complexes during the cyclic deformation.