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激光扫描速度对选区激光熔化TiC/AlSi10Mg复合材料微观组织与耐蚀性能的影响

Effect of laser scanning speed on microstructure and corrosion resistance of TiC/AlSi10Mg composites fabricated by selective laser melting

    摘要
  • 摘要: 使用激光选区熔化技术（selective laser melting，SLM）制备TiC/AlSi10Mg复合材料，探索不同激光扫描速度对SLM-TiC/AlSi10Mg复合材料微观组织、力学和耐腐蚀性能的影响。结果表明，随着激光扫描速度（600、800、1000、1200 mm/s）的提高，材料内部缺陷逐渐降低，晶粒尺寸和均匀性得到明显的改善，TiC颗粒弥散分布特性得到显著提升。同时，SLM-TiC/AlSi10Mg复合材料硬度从HV(121.1±2.0)提高至HV(132.5±2.0)。随着激光扫描速度的逐渐提高，SLM-TiC/AlSi10Mg复合材料的腐蚀电流密度从1.57×10−6 A∙cm−2降低至1.57×10−7 A∙cm−2，材料的耐腐蚀性能获得显著提升。

     

    Abstract: The TiC/AlSi10Mg composites were fabricated by selective laser melting (SLM), and the influence of laser scanning speed (600~1200 mm/s) on the microstructure, mechanical properties, and corrosion resistance was systematically investigated in this paper. The results demonstrate that the internal defects of the TiC/AlSi10Mg composites are reduced and the grain size is significantly improved with the increasing of laser scanning speed. Additionally, the dispersion characteristics of TiC particles are notably promoted. Concurrently, the hardness of the SLM-TiC/AlSi10Mg composites increases from HV(121.1±2.0) to HV(132.5±2.0). Moreover, with the progressive increase in laser scanning speed, the corrosion current density of the composites decreases from 1.57×10−6 A·cm−2 to 1.57×10−7 A·cm−2, indicating a substantial improvement in corrosion resistance.

     

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