在半钢轧辊表面激光熔覆的合金粉末中添加1.0 wt%含量的稀土氧化物Y₂O₃，产生了显著的固熔强化和弥散强化作用，熔覆组织高度细化，产生显著的晶粒细化和强韧性作用，且碳化物的弥散和均匀分布可以有效地阻止晶粒长大，避免热影响区片状马氏体的急剧增加，从而有效的防止裂纹的产生。可以在很大程度上提高半钢轧辊的耐磨性、硬度、抗冷热疲劳强度等各项性能，取得了良好的使用效果。<br/>When adding 1.0 wt% rare earth oxide Y₂O₃ to laser cladding alloy powder on the surface of semi- steel rolls, it made a significant effect on solid fusion strengthening and dispersion strengthening, the microstructure of cladding layer was highly refined, and had a significant role in grain refine-ment and toughness. In addition, the dispersion of carbide and its uniform distribution could pre-vent grain growth effectively, avoided the dramatical increasing of lamellar martensite in the heat affected zone, thus prevented the generation of cracks effectively. It largely improved the semi- steel rolls wear resistance, hardness, resistance to cold and hot fatigue strength, so it obtained good using effect.