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질산을 이용한 Ti-6Al-4V의 레이저 표면 질화처리
황태우(T. W. Hwang),이성훈(S.H. Lee),문영훈(Y. H. Moon) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.10
Surface nitriding of Ti-6Al-4V to obtain high surface hardness can be achieved by performing the laser melting in a nitric acid. In this study, the effect of process parameters on the characteristics of surface nitriding has been investigated to achieve higher surface hardness without process-induced cracks. The effects of process parameters were experimentally studied and process window is provided on the basis of microstructure, microhardness, and cracking of the nitride layers. It is shown that hardened layers having various depth and hardness can be obtained by controlling the processing parameters. Low scanning speed coupled with higher nitric acid rate results in crack-free layer at the expense of both a higher hardness and a deeper melt depth.
질소가스를 이용한 Ti-6Al-4V의 레이저 표면 질화처리
황태우(T. W. Hwang),김재현(J. H. Kim),우영윤(Y. Y. Woo),길태동(T. D. Kil),문영훈(Y. H. Moon) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.5
Surface nitriding of Ti-6Al-4V can be achieved by laser melting in a flow of nitrogen gas, and high surface hardness values could be obtained. In this study, the effect of process parameters on surface nitriding of a Ti-6Al-4V alloy has been investigated to achieve higher surface hardness without process-induced cracks. The effects of process parameters were experimentally studied and process window is provided on the basis of microstructure, microhardness, and cracking of the nitride layers. It is shown that hardened layers having various depth and hardness can be obtained by controlling the processing parameters. High scanning speed coupled with lower nitrogen flow rate results in crack-free layer at the expense of both a lower hardness and a shallower melt depth.
바이메탈-슬래브의 평판 압연시 판 휨 거동 분석 및 수식모델 개발
이철환(C. H. Lee),황태우(T. W. Hwang),지원종(W. J. Ji),문영훈(Y. H. Moon) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
The warping behavior of bimetal-slab during flat rolling process are characterized in this study. An analytical model that can predict warping amount in bimetal-slab rolling is proposed on the basis of bending effect due to the related mismatch of longitudinal elongation during flat rolling. The warping model focuses on the mismatch of length-wise elongation due to the difference of deformation resistances between constituent materials of bimetallic-slab. Using this analytical model, the warping behavior of the bimetal-slab during rolling process at various processing parameters, such as initial thickness ratio and rolling reduction were studied. For the validation of analytical model, flat rolling operations by using Al1050/Al6061 bimetal-slab produced by continuous clad casting has been performed. The deformation characteristics of bimetal-slab during rolling process were also validated by finite element analysis using a commercial finite element code, FORGE™. From this study, the warping behaviors of bimetal-slab during flat rolling have been reliably characterized.