THE EFFECT OF HEAT INPUT ON THE MICROSTRUCTURE AND PROPERTIES OF NICKEL ALUMINUM BRONZE LASER CLAD WITH A CONSUMABLE OF COMPOSITION Cu-9.OAl-4.6Ni-3.9Fe-1.2Mn

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Authors
  1. Hyatt, C.V.
  2. Magee, K.H.
  3. Betancourt, T.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The effect of heat input in the laser cladding of nickel aluminum bronze was investigated. Nickel aluminum bronze castings were clad with a consumable of the composition Cu-9.OAl-4.6Ni-3.9Fe-1.2Mn and exposed to a variety ofheat inputs from 42.5 to 595 J/mm. At the lowest heat input, the deposit microstructure was almost entirely martensitic. Increases in heat input caused the amount of alpha to increase. Depending upon heat input, the alpha was preesnt as grain boundary allotriomorphs, secondary Widmanstaetten alpha sideplates, and intragranular Widmanstaetten alpha precipitates. The reheated zones were of lower hardness and, at all heat inputs, consisted of a mixture of grain boundary allotriomorphs and Widmanstaetten alpha and martensite. Laser cladding improved the corrosion- and cavitation-erosion resistance of the surfaces but reduced their ductility. The properties of the clad surfaces depended on heat input.
Keywords
Laser cladding;Laser surface melting;Low heat input welding;Nickel aluminum bronzes;Cavitation erosion
Date of publication
01 Jun 1998
Number of Pages
15
Reprinted from
Metallurgical and Materials Transactions A, vol 29A, 1998, p 1677-1690
DSTKIM No
99-00110
CANDIS No
509920
Format(s):
Hardcopy;Document Image stored on Optical Disk

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