The microstructure was observed using backscattered electrons in the SEM (see Fig. 1). The gray and the dark phases were Mo2FeB2 hard phase and Fe binder phase, respectively. It can be seen the grain size is affected by the carbon content. The cermets without carbon addition exhibited the biggest grain size. The content of the main alloy elements in the binder phase was determined, the content of Mo element in binder phase increased with increasing carbon content.
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