采用CO2激光器在HT250基体上分别以不同预热温度制备NiCuFeBSi合金熔覆层,研究基体预热温度对白口组织控制、结合界面元素分布及抗拉强度的影响.结果表明:提高预热温度,有利于降低半熔化区白口化趋势,白口组织呈断续分布,但也导致熔覆层稀释率增大,更多基体Si,P杂质元素稀释进入熔池形成杂质相.拉伸实验表明:熔覆层抗拉强度远大于HT250,熔覆层断裂机制为解理与准解理混合型断裂.观察发现NiCuFeBSi合金激光熔覆层凝固后晶粒内部存在大量位错线并交叉缠结形成亚结构,进一步细化了晶粒,有利于提高熔覆层的强度与性能.最终获得NiCuFeBSi合金熔覆层在HT250基体上的最佳温度为室温30℃.
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