LASER PROCESSING OF NICKEL ALUMINUM BRONZE FOR USE IN PROPELLER FABRICATION AND REPAIR

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Authors
  1. Marsico, T.A.
Corporate Authors
Pennsylvania State Univ, State College PA (US) Applied Research Lab;Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Laser beam materials processing technology was first employed on nickel aluminum bronze (NAB) cast components by the Applied Research Laboratory. The Pennsylvania State University (ARL Penn State) in 1989 to meet the stringent tolerance requirements of newly designed components and to provide a viable economic means of repairing existing damaged components. Laser beam welding (LBW) offers a low heat input process resulting in much less distortion of the workpiece as well as reduced residual stresses when compared to that observed in components welded using GMAW. Laser beam cladding (LBCL) is the process of melting alloying elements onto the surface of a metal to repair mechanically-induced structural damage and it can also be used to improve the wear and corrosion resistance of the base alloy. Techniques have been developed for laser beam welding and cladding NAB cast and wrought materials using both high power carbon dioxide (CO2) and neodymium yttrium aluminum garnet (Nd: YAG) laser systems respectively. The specifics of these techniques will be presented. Also, two approaches for LBCL NAB material onto NAB cast substrate have been developed by: (i) melting NAB powder onto the substrate using a rather low power density rastering beam, and (ii) melting NAB wire onto the substrate using a defocused high density beam. The resultant macro and microstructures of the two types of clads will also be presented.
Report Number
DREA-SR-97-002-PAP-16 — CONTAINED IN 98-00986
Date of publication
01 Oct 1997
Number of Pages
22
DSTKIM No
98-01002
CANDIS No
507219
Format(s):
Hardcopy;Document Image stored on Optical Disk

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