Carbon addition effects on microstructure and small-scale hardness for Ti(C,N)-FeNi cermets Articles uri icon

authors

  • BESHARATLOO, H.
  • NICOLAS MORILLAS, MARIA DE
  • WHEELER, J.M.
  • MATEO, A.
  • Ferrari, BegoƱa
  • GORDO ODERIZ, ELENA
  • LLANES, L.
  • ROA, J.J.

publication date

  • August 2019

start page

  • 1

end page

  • 9

volume

  • 85(105064)

abstract

  • The current study investigates the influence of carbon addition on the microstructural and micromechanical properties of Ti(C,N)-FeNi cermets with different ceramic/metal phase ratios. Evaluation of small-scale hardness is conducted by using high speed nanoindentation in conjunction with statistical analysis. It allows to gather extremely large data sets (40,000 imprints per grade and condition); and thus, detailed hardness mapping at the microstructure length scale. Subsequent statistical analysis was done by considering three mechanically distinct phases: Ti(C,N) particles, the metallic binder, and one exhibiting the composite behaviour (i.e. imprints probing two-phase regions). In general, it is found that porosity amount is reduced as ceramic/metal phase ratio decreases and carbon is added. Carbon addition is also observed to rise small-scale hardness, but only for two of the defined phases: metallic binder and the composite one. Similar trends are observed regarding the influence of ceramic/metal phase ratio and carbon addition on the inverse hardness-fracture toughness correlation measured under high applied loads.

keywords

  • cermet; high speed indentation; hardness; mechanical mapping; massive indentation; statistical analysis