通过对两相WC-Ni硬质合金和Ni-W-C γ相模拟合金试样的X射线衍射相分析，扫描电镜显微结构参数的体视学测量及性能测试，建立了显微结构参数间的定量关系式及维氏硬度与显微结构参数间的Hall-Petch型关系式。结果表明，γ相平均自由程λ与WC晶粒邻接度CWC间存在反向对应关系、与γ相体积分数fγ和WC平均晶粒尺寸LWC间存在正向对应关系，说明fγ和LWC对λ~CWC实验关系的影响在测量误差范围内，因而用CWC(或λ)、fγ和LWC中任意两个参数都可准确表征两相WC-Ni硬质合金的结构特征；合金的维氏硬度与显微结构参数的关系可用混合物规则，通常用HV=3 560+7.00λ-1/2=3 560+2 163·(1-CWC)-1.85=3 560+23.7·(f-1γ-1)0.40·L-0.40WC亦能满足测定精度的要求。

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 CWC is in opposite correlation and the relation of λ with the γ-phase volume fraction fγ and the WC average grain size LWC is in positive, it shows that the effect of fγ and LWC on the λ~(1-CWC) 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 CWC), fγ and LWC; the relationship of Vickers hardness with microstructure parameter can use the expression HV=3 560+7.00λ-1/2=3 560+2 163·(1-CWC)-1.85=3 560+23.7(f-1γ-1)0.40·L-0.40WC, it is usually accurate enough too.