Preliminary Development of Cold Spray Procedures for Nickel Aluminum Bronze Casting Repair

Abstract:

Nickel aluminum bronze (NAB) castings possess favourable combinations of strength and resistance to corrosion, biofouling and cavitation/erosion, and so have long been used in naval applications. Nonetheless, in seawater environments NAB castings are susceptible to selective phase corrosion and so such components periodically require either replacement, which is very costly, or repair. However, repairs involving traditional, high heat input welding operations can lead to distortion and microstructural changes that unacceptably degrade NAB corrosion performance, and so repairs are not commonly performed. In the present work, cold spray is explored as an alternative for NAB (alloy CuAl9Fe5Ni5) repair without excessive distortion or base metal degradation, and preliminary results of its performance reported. Suitable cold spray parameters have been determined using an iterative approach by analyzing deposits in terms of microstructure, porosity and adhesion to the substrate. It is intended that these parameters will later be used to create simulated repairs which can be more thoroughly characterized for strength, toughness and corrosion performance.

• Periodical: Materials Science Forum (Volume 1016)
• Pages: 971-977
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1016.971
• Online since: January 2021
• Authors: Cameron Munro*, Phuong Vo, Bruno Guerreiro
• Keywords: Cold Spray, Copper Alloy, Metal Deposition, Nickel Aluminum Bronze, Repair

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