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소형 헬리컬 기어 압출 시 Zn-22wt%Al 합금 분말의 강화방법에 따른 미세 조직 변화에 관한 연구
이경훈(K.H. Lee),이정민(J.M. Lee),고대철(D.C. Ko),김병민(B.M. Kim) 한국소성가공학회 2011 압출 및 인발 심포지엄 Vol.2011 No.8
The extrusion with different powder consolidation methods, which is based on the superplastic behavior of the Zn-22wt%Al alloy powder, is proposed to observe the microstructure of helical gears and extrudability. The specifications of the helical gears were as follows: m, 0.3; Z, 12; Dp, 3.727mm; and β, 15˚. Compacted powders were consolidated by solution treatment, dwelling & quenching and sintering. The consolidated billets consisted of equiaxed fine grained structure, lamellar structure and mixed phase. Extrusion experiments were carried out under the following conditions: temperature, 250˚C and extrusion velocity, 0.1mm/min. The mechanical properties of extruded helical gears were investigated by measurement of Vickers hardness, extrusion load and SEM observation.
Titanium 소재를 이용한 연료전지 분리판 제조 특성 및 TiN 박막 물성 평가
이경훈(K. H. Lee),진철규(C. K. Jin),강충길(C. G. Kang) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
In this study, the rubber pad for forming process is used to fabricate the micro-channel plate of Titanium for the fuel cell. The geometry of plate should have micro-channel and thin for high-efficiency heat exchanger. The micro-channel plate was fabricated using a hydraulic press with a capability of 200 ton according to the various parameters (type of plate, plate thickness, punch speed, press pressure, rubber thickness, rubber hardness, draft angle)of the rubber pad forming in order to evaluate the formability. TiN films were deposited by reactive DC magnetron sputtering (DCMS) with an electromagnetic field system (EMFS). The microstructure and corrosion resistance of the TiN-coated Titanium substrates were estimated by Nano-indentationXP (MTS), Atomic Force Microscopy (AFM), and electrochemical methods. This improved corrosion resistance of the TiN films could be attributed to the densification of the film caused by enhancement of nitrification with increasing high reactive nitrogen radicals.
이경훈(K. Lee),곽은정(E.J. Kwak),김헌영(H. Y. Kim),이기동(Gi-Dong Lee),박종규(Jong-Kyu Park),서창희(Chang Hee Suh) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
In hot press forming process, the desired high strength can be obtained through quenching process after cold forming of product. The quenching process, however, accompanies undesired distortion due to the volume change during the phase transformation as well as by thermal contraction. In this study the numerical simulation with DEFORM3D-Micorstucture is used to predict the deformed shape during the quenching for the quenching fixture design.