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인코넬 718의 기계가공시 PVD와 CVD 코팅공구의 성능
김경우(K.W. Kim),최현민(H.M. Choi),채왕석(W.S. Chae),김동현(D.H. Kim) 한국자동차공학회 2001 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
This study focuses attention on the performance of coated carbide tools, processed using physical vapour deposition (PVD) and chemical vapour deposition (CVD) techniques, when machining a nickel based alloy, Inconel 718. The investigation shows that flank wear, chipping and fracture of cutting edges were the dominant failure modes when machining Inconel 718 with two grades of PVD coated tools at the cutting conditions investigated while the CVD coated tool failed mainly by severe notching wear in addition to flank wear. The multi-layer(TiC/Al₂O₃/TiN) CVD coated tools outperformed the single-layer(TiN) PVD coated tools when machining Inconel 718 due to the higher flank wear resistance of the TiC/Al₂O₃/TiN coatings. The multi-layer (TiN/TiCN/TiN) PVD coated tools gave the best pcrfonnance in all the machining trials due to the low temperature coating process which tends to retain the room temperature properties of the coatings as well as the smaller grain size plus higher density of their substrates, factors which ensure higher strength and hardness. Statistical regression analysis of experimental data showed that cutting speed has the most significant influence on tool performance while feed rate and depth of cut only have a marginal effect<br/>