A structural investigation of a plasma sprayed Ni--Cr based alloy coating
- Department of Materials Science and Engineering, State University of New York, Stony Brook, New York 11794-2275 (United States)
- Naval Research Laboratory, Washington, DC 20375-5000 (United States)
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.
- OSTI ID:
- 7081948
- Journal Information:
- Journal of Materials Research; (United States), Vol. 8:1; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHROMIUM ALLOYS
MICROSTRUCTURE
NICKEL ALLOYS
BINARY ALLOY SYSTEMS
PLASMA
SPRAYED COATINGS
STEELS
SUBSTRATES
X-RAY DIFFRACTION
ALLOY SYSTEMS
ALLOYS
COATINGS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
IRON ALLOYS
IRON BASE ALLOYS
SCATTERING
360101* - Metals & Alloys- Preparation & Fabrication