MICROSTRUCTURE CHARACTERIZATION OF LASER-CLAD NICKEL ALUMINUM BRONZE ALLOYS USING TRANSMISSION ELECTRON MICROSCOPY

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Authors
  1. Bennett, J.C.
  2. Hyatt, C.V.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Nickel aluminum bronze (NAB) alloys are used for many marine applications due to their excellent sea water corrosion resistance and good mechanical properties. At the Defence Research Establishment Atlantic, laser surface modification techniques such as cladding and surface melting are being investigated for the repair and surface engineering of NAB alloy components. In these processes, a high intensity laser is focussed to melt a thin surface layer. Since the melting occurs over a very short time, the bulk of the component remains cool and acts as an infinite heat sink. The consequent very rapid self-quenching and resolidication which occurs may in turn generate metastable phases. Currently, there is little data available concerning the microstrutures produced in laser processed NAB alloys. In this paper, transmission electron microscopic (TEM) observations of the microstructure developed in a commercial (C95800) NAB alloy cladding are reported.
Keywords
Laser cladding;Low Heat Input Welding
Date of publication
01 Apr 1997
Number of Pages
19
DSTKIM No
98-00571
CANDIS No
507271
Format(s):
Hardcopy;Document Image stored on Optical Disk

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