研究了选区激光熔化(SLM)成形单熔道的形态及其形成原因:随着扫描速度的增加,单熔道形态逐渐从连续态过渡到断续态、球化态.在单熔道成形基础上进行正交试验,并讨论了SLM成形高致密度金属零件的能量输入条件及其对成形零件致密度的影响:当能量输入低时,致密度随着能量输入的增加迅速增大；随着能量输入的增加,致密度增加缓慢,进入屈服阶段；当能量输入继续增加,其对致密度的影响趋向复杂化.研究能量输入与致密度的关系,对SLM成形工艺具有指导作用.%First researched the shape of the single track on selective laser melting (SLM) and the corresponding forming conditions: with the increase of the scanning speed, the single track shape from continuous state gradually transferred to the discrete states, balling state. Based on the single track experiments, orthogonal experiments were done, and the energy input condition for forming high density metal parts was discussed. Based on the orthogonal experiments result and the energy input definitions, the relationship between part's density and energy input was analyzed: when energy input was low, the part's density will increase rapidly with the energy input; with the energy input increase, the part' s density will increase slowly and into the yield stage; when the energy input continue to increase, the relationship between energy input and the part's density trends to become complicate. The relationship between energy input and the metal part's density that discussed in this paper has guiding significance during SLM experiments.
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