Effect of Carbon Stabilizing Elements on WC Cemented Carbides with Chromium Steel Binder

  • Marek TARRASTE Department of Mechanical and Industrial Engineering, Tallinn University of Technology
  • Jakob KÜBARSEPP Department of Mechanical and Industrial Engineering, Tallinn University of Technology
  • Kristjan JUHANI Department of Mechanical and Industrial Engineering, Tallinn University of Technology
  • Arvo MERE Department of Materials and Environmental Technology, Tallinn University of Technology
  • Mart VILJUS Department of Mechanical and Industrial Engineering, Tallinn University of Technology
Keywords: cemented carbides, alternative binder, erosion resistance, microstructure evolution

Abstract

High price, limited availability and toxicity of cobalt motivates researchers and material engineers to find alternative binder systems for WC cemented carbides. Iron and iron alloys are promising candidates for complete cobalt substitution. Ferritic steels alloyed with chromium can offer an inexpensive binder system to acquire cemented carbides with enhanced oxidation and corrosion resistance. Since Fe and Cr are carbide formers, production of WC-FeCr cemented carbides with a desirable two-phase structure can be problematic. Niobium and titanium are strong carbide formers and well-known alloying elements in steels used to stabilize carbon, preventing formation of unwanted chromium carbide phases. In our work, WC-FeCr was alloyed with elemental Nb and Ti. The phase composition, structure morphology and mechanical properties of prepared cemented carbides were characterized and discussed. As a result, additions of carbon stabilizing elements enabled us to improve structural homogeneity and wear resistance of WC cemented carbides with ferritic a steel binder.

Published
2019-03-15
Section
POLYMERS AND COMPOSITES, WOOD