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Journal of KWJS 2007;25(1):30-36.
Published online March 26, 2007.
공정 변수에 따른 Al 모재와 Fe계 합금 분말의 레이저 오버레이층 거동
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Effect of Process Parameters on Laser Overlay Behavior of Fe-based Alloy Powder on Aluminum Substrate
Yeon-Gon Yoo, Namhyun Kang, Cheol-Hee Kim, Jeong-Han Kim, Mok-Soon Kim
Abstract
  A joining of disimilar metal combination faces signifi cant problems such as poor strength and cracking asociated with britle intermetallic compounds (IMC) formed. An aplication of laser allows low heat input; leading to les dilution and smaller heat afected zone. The CO₂ laser overlay was conducted on an AC2B alloy with feeding Fe-based powders. The overlay area was signifi cantly influenced from the travel velocity rather than the powder f eeding rate. The interface between the overlay and substrate consisted of the hard and britle IMC (FeAl₃, Fe₃Al, Fe₂Al?), which initiating and propagating the crack. The reciprocating test for the slide wear was conducted on a multi-pas overlay experiment. Comparing with the multi-pas overlay with no overlap, the overlay with 50% overlap showed beter wear resistance.
Key Words: CO₂ laser, Clading, Fe-based powder, Al su bstrate, Crack, Overlay, Wear resistance


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