FORGED COPPER-NICKEL-CHROMIUM ALLOY FOR SEAWATER SYSTEM COMPONENTS

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Authors
  1. Galsworthy, J.C.
  2. Baxter, D.
Corporate Authors
Defence Evaluation and Research Agency, Farnborough (England);Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The high strength copper nickel chromium alloy, NES824, is a prime choice to replace the current nickel aluminium bronze alloy used in cast seawater system components. Difficulties encountered in casting this alloy has prompted the development of a forging production route for some components. This paper describes the studies undertaken to demonstrate the feasibility of a forging route for this alloy. After initial forging trials to establish forging parameters, two components were fabricated. These components were evaluated for structural integrity. One component was destructively evaluated to determine microstructure and compositional variations; mechanical and corrosion properties; and samples used for welding trials using arc and EB processes. All properties were compared with those typical of the cast version of the alloy. The investigations have demonstrated that the forging of copper nickel chromium components is a viable process. The mechanical properties of teh forged material were in all cases at least as high as those of cast material. Tensile properties were significantly better. General corrosion rates of forged and cast material were similar. The forged material was more readily weldable.
Report Number
DREA-SR-97-002-PAP-29 — CONTAINED IN 98-00986
Date of publication
01 Oct 1997
Number of Pages
13
DSTKIM No
98-01015
CANDIS No
507232
Format(s):
Hardcopy;Document Image stored on Optical Disk

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