Characterization of the Microstructure of 50% Nickel - 50% Chromium Alloy Produced by Spray Metal Forming
NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD SURVIVABILITY STRUCTURES AND MATERIALS DIRECTORATE
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In order to understand the microstructure of 50V0 nickel - 50 chromium alloy produced using spray forming, 3 mm diameter disks of the alloy were cut from several samples. The disks were thinned by electrochemical jet polishing using a mixture of HJP04 and H2S04. The microstructure is very complex. Some areas showed a composite structure of spherical 5- Cr-Ni particles imbedded in a dimpled matrix of Cr-Ni. Some areas had a distribution of spherical 8- Cr-Ni and Cr-Ni imbedded in planar nickel matrix. The most interesting result is that the microstructure consisted of areas of fine disc shaped Ni3C, Cr2C and CrC carbide precipitates dispersed in a nickel matrix. These carbides always tend to orient in a preferred direction, and formed a concentric ring type structure.
- Laminates and Composite Materials
- Properties of Metals and Alloys