采用二维点阵错配度理论 ,对不同稀土夹杂物和中高碳钢堆焊时常见氧化物在熔敷金属中成为初生奥氏体非均质形核核心的有效性进行了分析和计算。成为熔敷金属中初生奥氏体非均质形核核心的夹杂物以Ce2 O3,La2 O3和Ce2 O2 S为有效 ,Al2 O3,SiO2 ,MnO和CeS为无效。 Using the theory of two-dimensional lattice misfit, the effectiveness of the common oxides in the deposited metal to form primary austenite heterogeneous nucleation nuclei during the welding of rare earth inclusions and medium-high carbon steels was analyzed and calculated. The inclusions that become the primary austenite heterogeneous nucleation sites in the deposited metal are effective with Ce2 O3, La2 O3 and Ce2 O2 S, and Al2 O3, SiO2, MnO and CeS are ineffective.