Microstructural response of various chromium carbide based coatings to erosion and nano impact testing

Venkatesh, L.International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur, Hyderabad 500005, India. (författare)

In this study, we demonstrate the microstructure dependency of erosion behaviour of laser clad, detonation sprayed and atmospheric plasma sprayed chromium carbide based coatings. The final chromium carbide content in all the coatings was a strong function of rapid solidification rate associated with the processes. In the laser clad coating majority of the chromium carbides re-solidified while in the thermally sprayed coatings chromium carbide re-solidification was hindered to a large extent. Hence, the final chromium carbide content in the thermally sprayed coating decreased with increased extent of particle melting during spraying. Decarburisation and oxidation during thermal spraying lead to the formation of chromium carbides with lower carbon content and chromium oxide(s). Laser clad and detonation sprayed coatings, with higher chromium carbide content, showed lower erosion rates and exhibited fewer brittle erosion events. Embrittlement due to excessive dissolution of chromium carbides into the matrix and poor splat bonding were found to be the reasons for higher erosion rate of the plasma sprayed coating. Scanning electron microscopy and quantification of single erodent impact events clearly established ductile material removal in the laser clad and detonation sprayed coating and brittle material removal in the plasma sprayed coating as the dominant mechanism(s). A good agreement was found between solid particle erosion testing and nano impact testing results.

TEKNIK OCH TEKNOLOGIER Materialteknik Bearbetnings-, yt- och fogningsteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Manufacturing, Surface and Joining Technology hsv//eng
Solid particle erosion; Electron microscopy; Metal matrix composite; Hardness; Thermal spray coatings; Laser processing
Manufacturing and materials engineering
Produktions- och materialteknik

Pitchuka, Suresh BabuInternational Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur, Hyderabad 500005, India (författare)
Sivakumar, G.International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur, Hyderabad 500005, India (författare)
Gundakaram, Ravi C.International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur, Hyderabad 500005, India (författare)
Joshi, Shrikant V.,1960-Högskolan Väst,Forskningsmiljön produktionsteknik(PTW),Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),PTW(Swepub:hv)shrjos (författare)
Samajdar, I.Department of Metallurgical Engineering & Materials Science, IIT Bombay, Powai, Mumbai 400076, India (författare)
International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur, Hyderabad 500005, India.International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur, Hyderabad 500005, India (creator_code:org_t)

Av författaren/redakt...: Venkatesh, L.; Pitchuka, Suresh ...; Sivakumar, G.; Gundakaram, Ravi ...; Joshi, Shrikant ...; Samajdar, I.

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