Materials Research Express (Jan 2021)

Effect of secondary carbides on the core-rim structure evolution of TiC-based cermets

  • Min Chen,
  • Xuefeng Zhang,
  • Xuan Xiao,
  • Haiquan Zhao

DOI
https://doi.org/10.1088/2053-1591/ac0d92
Journal volume & issue
Vol. 8, no. 7
p. 076501

Abstract

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Herein, the effect of adding VC with different contents and Mo _2 C, WC and TaC on the core-rim structure evolution of TiC-based cermets was investigated using x-ray diffraction, scanning electron microscopy and energy-dispersive spectroscopy. Results show that the added secondary carbides exhibiting the same crystal stucture as TiC are prone to solid dissolution in TiC grains and change the core-rim stuctures of TiC-based cermets. With the addition of only VC, (Ti,V)C is the main component in the black core-grey rim structure and increasing the VC content is beneficial for promoting the dissolution process of cores. With the addition of multiple carbides, the core-rim structure in cermet Ta-7 is effectively improved, showing a high percentage of white core-grey rim structures, and the mechanical properties are improved.

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