Development of an Iron-Based Hardfacing Material Reinforced with Fe-(TiW)C Composite Powder

The objective of this work is to investigate the correlation of microstructure with wear resistance in a hardfacing material reinforced with Fe-(TiW)C composite powder particles. This material was designed for cladding components subjected to highly abrasive conditions and was deposited on a low-car...

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Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2007-05, Vol.38 (5), p.937-945
Main Authors: CORREA, E. O, ALCANTARA, N. G, TECCO, D. G, KUMAR, R. V
Format: Article
Language:English
Subjects:
Abrasive wear
Alloy solidification
Applied sciences
Arc deposition
Arc welding
Carbides
Chromium
Exact sciences and technology
Hard surfacing
Iron
Low carbon steels
Metal matrix composites
Metals. Metallurgy
Microstructural analysis
Microstructure
Niobium base alloys
Particulate composites
Powder metallurgy
Solidification
Stainless steel
Substrates
Wear resistance
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Summary:The objective of this work is to investigate the correlation of microstructure with wear resistance in a hardfacing material reinforced with Fe-(TiW)C composite powder particles. This material was designed for cladding components subjected to highly abrasive conditions and was deposited on a low-carbon steel substrate by open arc welding. The theoretical and experimental work undertaken includes solidification study, microstructural characterization, and abrasive wear testing. Microstructural analysis of the hardfaced top layer of the alloy showed the presence of TiWC carbide particles and TiNbC carbides randomly distributed in a eutectic mixture matrix γ/M^sub 7^C^sub 3^ containing primary austenite dendrites. Microstructural examinations also showed that hard and fine spherulitic carbides, in which a Ti-rich MC carbide core was encircled by MC carbide enriched with Nb and W, were homogeneously distributed in the matrix. The energy-dispersive spectroscopy (EDS) mapping of spherulitic carbides showed that the any added Nb replaced a significant part of W in the Fe-(TiW)C powder, and W preferentially partitioned into other carbides and matrix during solidification. Abrasion test results showed that the preceding carbides improve the wear resistance of the hardfacing material in comparison with conventional Fe-Cr-C and Fe-Cr-C-Nb alloys, especially under high stress conditions. [PUBLICATION ABSTRACT]
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-007-9141-6