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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.