Primary dendritic arm spacing (PDAS) is an important microstructure feature of the nickel-base single crystal superalloys. In this paper, a numerical model predicting the PDAS evolution with additive manufacturing parameters using pulsed laser is established, which combines the theoretical PDAS models with the temperature field calculation model during pulsed laser process. Based on this model, processing maps that related process parameters to the evolution of PDAS are generated. To obtain more accurate prediction model, the parameters of different solidification conditions, \(\overline{{G^{ - 0.5} V^{ - 0.25} }}\) and \(\overline{{G}^{-0.5}{V}^{-0.25}}\), are selected to calculate PDAS. The simulation results show that the PDAS increases as the arise of P and t. The processing-PDAS map can accurately predict the evolution of PDAS with pulsed laser process parameters, which is well in accordance with the experimental results. Additionally, the PDAS values calculated by the \(\overline{{G}^{-0.5}{V}^{-0.25}}\) are more in line with the experimental results than those calculated by the \({\bar{G}}^{-0.5}{\bar{V}}^{-0.25}\).

初级枝晶臂间距（PDAS）是镍基单晶高温合金的重要微观结构特征。本文建立了一个数值模型，该模型预测了脉冲激光加工过程中具有附加制造参数的PDAS演化，并将理论PDAS模型与温度场计算模型相结合。基于此模型，生成了将过程参数与PDAS演变相关的处理图。为了获得更准确的预测模型，使用不同凝固条件的参数\（\ overline {{G ^ {-0.5} V ^ {-0.25}}} \）和\（\ overline {{G} ^ {-0.5} {V} ^ {-0.25}} \）选择来计算PDAS。仿真结果表明，PDAS随着P和t的增加而增加。加工后的PDAS图可以准确地预测带有脉冲激光工艺参数的PDAS的演变，与实验结果吻合良好。此外，由\（\ overline {{G} ^ {-0.5} {V} ^ {-0.25}} \）计算出的PDAS值比由\（{ {G}} ^ {-0.5} {\ bar {V}} ^ {-0.25} \）。