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페라이트상을 갖는 마르텐사이트계 내열강의 미세조직 및 감쇠능에 미치는 열처리의 영향
김윤규(Y. K. Kim),최한글(H. G. Chio),성장현(J. H. Sung),강창룡(C. Y. Kang) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
This study was carried out to investigate the effect of microstructure on the damping capacity of martensite heat-resistant steel with ferrite phase. In case of the specimen with martensite plus ferrite phase, the volume faction of ferrite phases was under 5%. The damping capacity was decreased with the increase of solution treatment temperature and time. With the increase of tempering temperature and time damping capacity was increased. The damping capacity was higher in case of specimen with martensite single phase than the specimen with martensite phase contained the ferrite phases.
이건엽(G. Y. Lee),이혜경(H. K. Lee),박성필,김윤규(Y. K. Kim),문영훈(Y. H. Moon) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Hydroformed parts have higher dimensional accuracy, structural strength, and dimensional repeatability. Particularly in the automotive industry, manufacturing of parts with complex shapes from tubular materials sometimes requires one or more pre-forming operations such as bending before the hydroforming process. The pre-bending process is an important factor for successful hydroforming in the case where the perimeter of the blank is nearly the same as that of final product. The bendability of a tube depends on the parameters such as the bending radius, variation of the diameter, thickness, hardness. This study shows the analysis of bending through the stainless steel tubes bent to rotary draw bending machine.
슈퍼2상 스테인리스강의 기계적 성질에 미치는 W첨가의 영향
김수천(S. C. Kim),김윤규(Y. K. Kim),최한글(H. G. Choi),강창롱(C. Y. Kang) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
To recognize the effect of W addition on the mechanical properties in super duplex stainless steel, different W content is prepared. And we makes an experiment on different aging heat treatment conditions. At the result of, the effect of aging temperature is low precipitation of sigma phase at 475 °C, but precipitation of sigma phase at 600℃ and 750℃ is rapidly increased. But at 900 °C, precipitation of sigma phase is lower than former times, because precipitation region of sigma phase is missed. Therefore, hardness and strength are higher than former times, but impact values and elongation are decreased. At 600℃, the effect of aging time is low precipitation of sigma phase at the shortest time, but the longer time aging heat treatment, the more increase sigma phase increased. Therefore, hardness and strength are higher than the shortest time, but impact values and elongation are decreased. Specimen of W added decrease precipitation of sigma phase than specimen of W not added, because specimen's of W added sigma phase is decreased that Mo is substituted to W, relatively low diffusion coefficient. So, hardness and strength of specimen of W not added are higher than specimen of W added, but impact values and elongation of specimen of W not added are lower than specimen of W added.
전륜 서스펜션 성능향상을 위한 하이드로포밍 샤시 부품의 설계 최적화
문만빈(M. B. Moon),김윤규(Y. G. Kim),김효섭(H. S. Kim),진경수(K. S. Jin),김동학(D. H. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Recently, automotive companies have invested in vehicle weight reduction and clean car development because of oil price rises and environmental problems. In particular, USA car makers have developed the vehicle spending 1 liter per 34km complying with PNGV(Partnership for a new generation of vehicle) and Europe car makers have developed the vehicle spending 3 liters per 100km. The USA government announced “The green car policy” in order to boost production of more fuel effective cars in 2009. According to the policy, it will be restricted to sell the car which spends more than l liter per 14.9km by 2020. To satisfy the current situations on automotive market, hydroforming technology has widely adapted vehicle structures such as engine cradle, chassis frame, A pillar, radiator support, etc. However, automotive companies have to consider formability and performance to improve and maximize the benefit from this technology in advance of detail design. The paper deals with one of the vehicle weight reduction methods using tube hydroforming technology and platform commonality in front suspension. FEA simulation is also introduced to evaluate hydro-formability and NVH performance at the beginning of design stage which is the best way to reduce the failure cost.