This paper studies the forming process of single-layercobalt-chromium alloys fabricated by selective laser melting. The reasonable forming process was determined by discussing the influence rule of laser power, scanning speed and overlap rate on the weld width and morphology. Results show that line energy φ has an impact on the molding quality and weld width dm, a continuous and regular weld pool with a small range of powder free zone was obtained when 1. 22 ＜ φ ＜2. 33 J/mm. A stable fitting relationship can be obtained between line energy and weld width with the optimized process parameters, which provides a reasonable reference for single multi-channel shaping. The adjacent cladding channels can be lapped closely when the overlap rate is 35% with the surface roughness as low as 5μm because the expansion height of the remelting portion is reasonable.%主要对单层钴铬合金SLM成型工艺进行研究,讨论了激光功率和扫描速度对于单道熔道宽度、形貌的影响及熔道搭接率对于单层多道成型表面形貌的影响,确定合理的成型工艺选择范围. 研究发现:线能量φ对熔道成型质量和熔池宽度dm具有影响,当1. 22 J/mm＜φ＜2. 33 J/mm时可以获得连续规则、无粉区范围极小的熔道;通过优化的工艺参数获得了线能量与熔宽的稳定拟合关系,为单层多道成型提供了数据支持;搭接率为35%时,相邻熔道之间搭接紧密,重熔部分的膨胀高度合理,使单层多道成型表面粗糙度最低为5 μm,可以获得光滑平整的表面.
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