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选区激光熔化钴铬合金工艺

Keywords: 线能量,熔道宽度,搭接率,表面粗糙度,成型质量

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Abstract:

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1.22J/mm<φ<2.33J/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5μm,可以获得光滑平整的表面.

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