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고속 추진체용 Alloy 718 노즐 단조품의 전자빔 용접성 평가
이채훈(C. H. Lee),김정한(J. H. Kim),홍재근(J. K. Hong),염종택(J. T. Yeom),윤종원(J. W. Yoon),박노광(N. K. Park) 한국소성·가공학회 2008 소성가공 : 한국소성가공학회지 Vol.17 No.7
In this study, mechanical properties of Alloy 718 welded after forgings for jet propulsion component was investigated. Hot-forged and machined work-pieces(230mm×70mm×15mm) which have different grain sizes are welded by electron beam welding technique. After welding, the components were solution heat-treated and aged. Samples were sectioned to analyze the microstructural evolution and formation of micro-crack. It was found that HAZ grain boundary liquation crack generally initiates in the coarse grains rather than the fine grains. Needle-like phases with high Nb contents were found at the outer part near the base metal. Vickers hardness and tensile tests were carried out at room temperature and at 649℃. The tensile properties of electron beam welding specimens exhibited around 100MPa and 10% decrease in strength and elongation, respectively.
Ti 분말 압연시 소결특성에 미치는 침입형 원소의 영향
이채훈(C. H. Lee),홍재근(J. K. Hong),염종택(J. T. Yeom),박노광(N. K. Park) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
In this study, the effect of interstitial elements on sintered characteristics were investigated for direct powder rolled titanium strip. Two powders with dissimilar interstitial concentration were used. Hydrogen content was declined after sintering. The mainly factor on sintered characteristics was oxygen contents. Increasing amount of Oxygen content was swelled in the smaller particle. Vickers hardness was measured across rolling direction and Transverse tensile test was carried out. Microstructure of sintered strip was also performed by Image analyzer and was measured average grain size.
대용량 해상풍력발전기용 쉬링크 디스크 제작 공정 최적화 방법 연구
허상현(S. H. Heo),장희상(H. S. Chang),김남용(N. Y. Kim),이채훈(C. H. Lee),이진모(J. M. Lee) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.10
Domestic free forging corporation was disposed to lean to shipbuilding industry, but have started to take part in wind turbine market since 2003, and exported product of blade, main shaft, tower, shrink disc, gear box, coupling and etc. Shrink disc is fundamental device for connecting rotor shaft and gear box in wind turbine system. But shrink disk isn"t localization, so depend on import. In this study optimization of production process for shrink disc for large scale offshore wind turbine system through hot formability evaluation and heat treatment analysis. And then, manufactured shrink disc prototype by applying optimized process and tested mechanical properties and microstructure for shrink disc prototype.