Wear-resistant amorphous and nanocomposite steel coatings

In this article, amorphous and nanocomposite thermally deposited steel coatings have been formed by using both plasma and high-velocity oxy-fuel (HVOF) spraying techniques. This was accomplished by developing a specialized iron-based composition with a low critical cooling rate (?104 K/s) for metall...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2001-10, Vol.32 (10), p.2615-2621
Main Authors: BRANAGAN, D. J, SWANK, W. D, HAGGARD, D. C, FINCKE, J. R
Format: Article
Language:English
Subjects:
ALLOYS
amorhous
Applied sciences
ATOMIZATION
COATINGS
Cross-disciplinary physics: materials science
rheology
CRYSTALLIZATION
Exact sciences and technology
GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
GLASS
HARDNESS
HEAT TREATMENTS
HVOF
Materials science
Metals. Metallurgy
Methods of deposition of films and coatings
film growth and epitaxy
MICROHARDNESS
MICROSTRUCTURE
nanocomposite
Physics
RUBBERS
SAND
Spray coating techniques
steel coatings
STEELS
TESTING
THICKNESS
WHEELS
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Summary:In this article, amorphous and nanocomposite thermally deposited steel coatings have been formed by using both plasma and high-velocity oxy-fuel (HVOF) spraying techniques. This was accomplished by developing a specialized iron-based composition with a low critical cooling rate (?104 K/s) for metallic glass formation, processing the alloy by inert gas atomization to form micron-sized amorphous spherical powders, and then spraying the classified powder to form coatings. A primarily amorphous structure was formed in the as-sprayed coatings, independent of coating thickness. After a heat treatment above the crystallization temperature (568°C), the structure of the coatings self-assembled (i.e., devitrified) into a multiphase nanocomposite microstructure with 75 to 125 nm grains containing a distribution of 20 nm second-phase grain-boundary precipitates. Vickers microhardness testing revealed that the amorphous coatings were very hard (10.2 to 10.7 GPa), with further increases in hardness after devitrification (11.4 to 12.8 GPa). The wear characteristics of the amorphous and nanocomposite coatings were determined using both two-body pin-on-disk and three-body rubber wheel wet-slurry sand tests. The results indicate that the amorphous and nanocomposite steel coatings are candidates for a wide variety of wear-resistant applications.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-001-0051-8