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Effect of pre-alloyed raw materials on the microstructure of a (Ti,W)(C,N)–Co cermet |
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| Authors: | P. Lindahl, A. E. Ros n, P. Gustafson, U. Rolander,H. -O. Andr n |
| Affiliation: | a Department of Experimental Physics, Chalmers University of Technology, SE-412 96, Göteborg, Sweden b AB Sandvik Coromant, R & D Materials and Processes, SE-126 80, Stockholm, Sweden |
| Abstract: | Four alloys manufactured from different combinations of powders (TiC + TiN + WC; Ti(C,N) + WC; (Ti,W)C + TiN and (Ti,W)(C,N)) were studied using X-ray diffractometry, optical microscopy (OM), scanning electron microscopy (SEM) and analytical electron microscopy (AEM). The alloy manufactured from binary powders had a smaller grain size and a more inhomogeneous microstructure than the other alloys. The alloys manufactured with WC contained an inner rim around Ti(C,N) cores, as well as W-rich cores. Thermodynamic calculations suggest that these are formed during solid-state sintering at 900°C in a low nitrogen activity. The outer rim had a composition that is in good agreement with calculations of the equilibrium during liquid phase sintering at 1450°C. |
| Keywords: | Core-rim structure XRD SEM AEM Thermo-Calc |
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