The quantitative experimental relationships between
microstructure parameters and the relationship of Vickers hardness with
microstructure parameter were deduced by means of XRD phase analysis,SEM stereological technique and property testing for dual-phase
WC-Ni cemented carbide and the simulative γ-phase alloys i.e.the Ni-W-C solution.The result shows that the relation of the γ-phase free path λ with the WC grain contiguity C(WC) is in opposite correlation and the relation of λ with the γ-phase volume fraction fγ and the WC average grain size L(WC) is in positive,it shows that the effect of fγ and L(WC) on the λ~(1-C(WC)) relation is within the limits of test error,so the structure of dual-phase WC-Ni alloy can be exactly charactered by use of any two parameters among λ(or C(WC)),fγ and L(WC);the relationship of Vickers hardness with
microstructure parameter can use the expression HV=3 560+7.00λ(-1/2)=3 560+2 163·(1-C(WC))(-1.85)=3 560+23.7(f(-1)γ-1)(0.40)·L(-0.40)(WC),it is usually accurate enough too.