为了研究选区激光熔化成形4Cr13模具钢的摩擦与腐蚀性能，使用选区激光熔化成形设备制备样品，并对其组织结构、力学、摩擦与腐蚀性能进行了系统研究。研究结果表明：随着激光功率的增加， SLM样品中马氏体组织先变粗再变细，硬度变化亦从高到低再升高，侧面硬度总体高于截面硬度；相对于铸态样品， SLM样品展现出较高的强度；在不同激光功率下，250 W条件下的样品表现出最优的压缩强度和磨损性能；在酸性溶液中， SLM样品的耐蚀性要优于铸态材料，且随着激光功率的升高，自腐蚀电位不断增大；在盐水溶液中， SLM样品耐蚀性略低于铸态材料。研究结果可为选区激光熔化技术制备4Cr13模具钢的工业应用提供必要的借鉴。%In order to study the friction and corrosion resistance of 4Cr13 die steel by selective laser melting ( SLM) , SLM equipment was used for sample preparation and a systematic study was conducted for the organization structure, mechanics, friction and corrosion resistance. Study results indicate that, with laser power increasing, martensite structure of SLM sample is thickened and then thinned, and the hardness is reduced and then in⁃creased. Side hardness is higher than section hardness on the whole. Compared with the sample under cast state, the SLM sample has the higher strength. Among various laser powers, the 250 W has the sample showing the best compressive strength and wear resistance. In acid solutions, SLM sample has the higher corrosion resistance than materials under cast state, and free corrosion potential continuously increases with laser power rising. In saline solu⁃tions, SLM sample has the lightly lower corrosion resistance than materials under cast state. The results can offer a necessary reference for industrial application of 4Cr13 die steel by SLM.
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