Ti-20%Ni(质量分数)合金激光立体成形组织由β-Ti枝晶和枝晶间(β-Ti+Ti2Ni)层片共晶及棒状共晶组成. 随着激光能量密度D e减小, 枝晶特征尺寸F减小. 枝晶特征尺寸及共晶间距的变化规律分别与枝晶生长KGT经典模型和共晶生长TMK经典模型吻合较好.
The effect of the processing parameters on the microstructure during laser solid forming (LSF) of Ti -20wt%Ni alloy was investigated. The microstructure consists of β-Ti dendrite and（β-Ti +Ti2Ni）rod and lamellar eutectic in the inter-dendrite. The characteristic dendritic size F decreased with the decreasing of laser energy density De, resulting from the decreasing of laser power and increasing of scanning velocity, in fact, the characteristic dendritic spacing was decided by. On the other hand, the eutectic spacing also decreased with the increase of scanning velocity. The variation of the characteristic dendritic size and eutectic spacing is roughly in accord with the KGT model and TMK model respectively.
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