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자동차 변속기 부품용 고탄소강의 강종 및 제조공정 최적화
정우창(W. C. Jeong) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
High carbon hot-rolled steels produced in steel works are cold-rolled, annealed, press-formed and finally heat-treated. A proper selection of steel type and manufacturing process of the high carbon steels is very important to reduce the cost and to meet the required properties. In this study, optimum steel type and manufacturing processes for automotive drive plate using high carbon steels have been derived. Press quenching process has been considered to reduce the dimensional change in the heat treatment.
이승열(S. Y. Lee),이경훈(K. Lee),임용희(Y. H. Lim),정우창(W. C. Jeong) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
The heat transfer characteristics between die and sheet and between die and coolant are major processing parameters in hot press forming process. The determination of quenching time to guarantee full martensitic transformation requires proper understanding of these heat transfer characteristics. The contact area changes drastically during the quenching process due to the volume change of both die and sheet by temperature drop and also phase transformation. Several different type of modeling method is tested and proposed proper method. The effect of martensitic transformation with respect to the quenching time is investigated and compared to the experiment. The influence of heat conductivity of die material is also considered.
김원상(W.S. Kim),김영신(Y.S. Kim),김정중(J.J. Kim),강윤종(Y.J. Kang),정우창(W.C. Jung),정병창(B.C. Jeong),홍정기(J.K. Hong),서인영(I.Y. Suh) 전력전자학회 2010 전력전자학술대회 논문집 Vol.2010 No.7
본 논문은 2㎿급 풍력시스템의 이중여자유도형 발전기(DFIG)를 제어하기 위한 PCS의 전력변환장치와 주변장치 및 제어기술에 대해서 기술한다. 최근 국내 뿐만 아니라 해외 전력회사에서는 계통전원 사고 시 풍력시스템이 계통연계를 유지하면서 계통의 전력품질에 기여할 수 있는 기능(FRT)을 요구하고 있다. FRT기능 구현을 위한 H/W와 제어 시퀀스를 소개한다.
Ti 첨가 극저탄소강에서 열 경화성에 미치는 Ti 량의 영향
한성호,정우창 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.9
Effect of Ti content on the bake hardening behavior was investigated in cold-rolled and continuously-annealed ultra-low carbon steels containing 0.075% P. TiN and TiS precipitates were observed in steel with Ti content lower than (48/14)N+(48/32)S while in the steel with Ti content higher than (48/14)N+(48/32)S, in addition to TiN and TiS, (Fe, Ti)P and Ti(C, N) were observed. A bake hardening of about 3kgf/㎟ was obtained in a steel with carbon content of about 25 weight ppm and Ti content controlled in N(48/14) ≤ Ti ≤ N(48/14)+S(48/32). Substantial amount of solute carbon might remain without affecting bake hardening. In the 0.0029-0.021% range, sulfur had little effect on the bake hardening. On the other hand, the solute carbon levels that resulted in yield point elongation of about 4.0 percent or less in as-annealed steel appeared to be too small to contribute to bake hardening and aging index.