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Interface Exploring of Tungsten Carbide-Stainless Steel Composites through HRTEM

Published online by Cambridge University Press:  28 September 2012

C. M. Fernandes ,
M.-G. Willinger ,
M. T. Vieira  and
A. M. R. Senos
C. M. Fernandes
Affiliation:
CICECO, Department of Ceramics and Glass Engineering, University of Aveiro, 3810-193 Aveiro, Portugal CEMUC, Mechanical Engineering, University of Coimbra, Rua Luís Reis Santos, Pinhal de Marrocos, 3030-788 Coimbra, Portugal
M.-G. Willinger
Affiliation:
Fritz Haber Institute of the Max Planck Society, Department of Inorganic Chemistry, Faradayweg 4-6, 14195 Berlin, Germany
M. T. Vieira
Affiliation:
CEMUC, Mechanical Engineering, University of Coimbra, Rua Luís Reis Santos, Pinhal de Marrocos, 3030-788 Coimbra, Portugal
A. M. R. Senos
Affiliation:
CICECO, Department of Ceramics and Glass Engineering, University of Aveiro, 3810-193 Aveiro, Portugal

Abstract

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Composites of tungsten carbide (WC) and stainless steel (SS) have been produced through an innovative powder coating technique using sputtering. These composites showed remarkable mechanical properties after vacuum sintering, in spite of significant amounts of brittle eta-phase, (M,W)6C. The formation of eta-phase is almost inevitable, because it is thermodynamically favoured for stoichiometric C in the WC-SS system and accelerated in the SS coated WC particles, due to the reduced diffusion distances between WC and SS and the nanocrystalline character of the metallic coating. Surprisingly, the mechanical properties are not seriously affected by the eta-phase. In fact, relatively tough and harder materials have been obtained compared to similar compositions of WC-Co. In order to understand the microscopic reason for the reported mechanical strength, in-depth structural analysis of grain boundaries and interfaces was performed by electron microscopy.

Type
Materials Sciences
Information
Microscopy and Microanalysis , Volume 18 , Supplement S5: Portuguese Supplement , August 2012 , pp. 109 - 110
Copyright
Copyright © Microscopy Society of America 2012