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A structural investigation of a plasma sprayed Ni-Cr based alloy coating

Published online by Cambridge University Press:  18 February 2016

S. Sampath ,
R. A. Neiser ,
H. Herman ,
J. P. Kirkland  and
W. T. Elam
S. Sampath
Affiliation:
Department of Materials Science and Engineering, State University of New York, Stony Brook, New York 11794-2275
R. A. Neiser
Affiliation:
Department of Materials Science and Engineering, State University of New York, Stony Brook, New York 11794-2275
H. Herman
Affiliation:
Department of Materials Science and Engineering, State University of New York, Stony Brook, New York 11794-2275
J. P. Kirkland
Affiliation:
Naval Research Laboratory, Washington, DC 20375-5000
W. T. Elam
Affiliation:
Naval Research Laboratory, Washington, DC 20375-5000
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Extract

A Ni-Cr based hardfacing alloy has been plasma sprayed in ambient and low pressure atmospheres onto mild steel substrates. These coatings exhibit excellent wear and corrosion resistance; however, the significance of microstructure on properties has not been reported. This study relates the structure of the sprayed coatings to the processing conditions. X-ray diffraction results indicate phase separation in air plasma sprayed deposits, while low pressure plasma sprayed deposits exhibit a single supersaturated solid solution. Annealing of the air plasma sprayed coating shows dissolution of the bcc chromium phase, confirming its metastable nature. These results were confirmed using Extended X-ray Absorption Fine Structure (EXAFS) analysis, which further suggests a highly disordered structure, with partial oxidation of selected alloying elements, such as chromium. Transmission electron microscopy indicates a wide variety of microstructures in the air plasma sprayed deposit. In the case of low pressure sprayed deposit, the microstructures are homogeneous and uniform.

Type
Research Article
Information
Journal of Materials Research , Volume 8 , Issue 1 , January 1993 , pp. 78 - 86
Copyright
Copyright © Materials Research Society 1993

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