LASER SURFACE MODIFICATION AND CLADDING OF NICKEL-ALUMINUM BRONZE

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Authors
  1. Magee, K.H.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Laser Inst, Edmonton ALTA (CAN)
Abstract
Copper based alloys are commonly used in marine environments for their inherent antifouling properties, and their good corrosion resistance in quiescent or laminar flowing seawater. Microstructural refinement of the surface regions of these materials by laser rapid solidification produces microstructural modifications which offer the potential to further improve these properties. In addition, low heat input laser weld overlaying has the capacity to reduce marine valve replacement costs by allowing repair, and subsequent reuse of corrosion damage valves. Laser surface melting and laser weld overlaying of nickel-aluminum bronze alloy has been performed using the energy from continuous wave, carbon dioxide lasers. Largely single phase martensitic microstructures can be obtained in the surface melted or weld overlaid regions provided the theoretical heat input is limited to lower than approximately 500 J/cm. High quality, imperfection free weld overlay deposits have been produced using 0.25 mm diameter wire feed. However, modifications to the experimental overlay wire feeder is required to improve the reproducibility of the process, and to enable further process development and eventual application on a commercial scale.
Report Number
DREA-CR-93-421 — Contractor Report
Date of publication
31 Mar 1993
Number of Pages
67
DSTKIM No
94-00877
CANDIS No
136334
Format(s):
Electronic Document(PDF);Originator's fiche received by DSIS

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