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공정 변수에 따른 Al 모재와 Fe계 합금 분말의 레이저 오버레이층 거동
유연곤,강남현,김철희,김정한,김목순,Yoo, Yeon-Gon,Kang, Nam-Hyun,Kim, Cheol-Hee,Kim, Jeong-Han,Kim, Mok-Soon 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.1
A joining of dissimilar metal combination faces significant problems such as poor strength and cracking associated with brittle intermetallic compounds(IMC) formed. An application of laser allows low heat input; leading to less dilution and smaller heat affected zone. The $CO_2$ laser overlay was conducted on an AC2B alloy with feeding Fe-based powders. The overlay area was significantly influenced from the travel velocity rather than the powder feeding rate. The interface between the overlay and substrate consisted of the hard and brittle IMC($FeAl_3,\;Fe_3Al,\;Fe_2Al_5$), which initiating and propagating the crack. The reciprocating test for the slide wear was conducted on a multi-pass overlay experiment. Comparing with the multi-pass overlay with no overlap, the overlay with 50% overlap showed better wear resistance.
공정변수에 따른 AI 모재와 Fe계 합금 분말의 레이저 오버레이층 거동
유연곤,강남현,김철희,김정한,김목순 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.1
A joining of dissimilar metal combination faces significant problems such as poor strength and cracking associated with brittle intermetallic compounds (IMC) formed. An application of laser allows low heat input; leading to less dilution and smaller heat affected zone. The CO2 laser overlay was conducted on an AC2B alloy with feeding Fe-based powders. The overlay area was significantly influenced from the travel velocity rather than the powder feeding rate. The interface between the overlay and substrate consisted of the hard and brittle IMC (FeAl3, Fe3Al, Fe2Al5), which initiating and propagating the crack. The reciprocating test for the slide wear was conducted on a multi-pass overlay experiment. Comparing with the multi-pass overlay with no overlap, the overlay with 50% overlap showed better wear resistance.
Al-Fe 레이저 오버레이층 경계면에서의 금속간화합물 거동
강남현,유연곤,이창우,김정한,Kang, Nam-Hyun,Yoo, Yeon-Gon,Lee, Chang-Woo,Kim, Jeong-Han 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.3
A $CO_2$ laser overlay was conducted by using a Fe-based powder on the AC2B aluminum substrate. Cracks and intermetallic compounds (IMC) were observed inconsistently along the interface between the overlay and post-molten layer. A scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) detected some Fe-rich IMC ($Fe_3Al$, FeAl) as well as the brittle Al-rich IMC ($Fe_2Al_5,\;FeAl_3$). Micro vickers hardness proved the formation of Al-rich IMC ($FeAl_3$) along the interface by showing HV0.1 $800{\sim}900$. Furthermore, nano indentation was successfully applied to investigate the behavior of IMC more precisely than the micro vickers hardness.