【摘要】 采用数值模拟方法，分析了激光弥散化工艺中熔池稳定熔融阶段的热流场分布、WC颗粒的运动轨迹及其在强化层中的分布规律，构建了基于热-流-固耦合的多物理场模型，揭示熔池内部流动特性及其对WC颗粒运动的影响。结果表明，Marangoni对流是影响熔池流动的主导因素，流速随温度梯度和光斑半径变化。不同工艺参数显著影响WC颗粒的运动模式及最终分布，较小光斑半径或低线能量密度导致WC颗粒局部富集，而适中光斑半径和线能量密度有助于WC颗粒的均匀沉积。通过优化工艺参数，提出了浅层均匀分布法和深层均匀分布法，实现了WC颗粒在不同深度强化层的稳定均匀分布。更多还原

【Abstract】 Thermal-fluid field distribution, the trajectories of WC particles and their dispersion behavior within the reinforced layer during the steady-state melting stage of the laser dispersion process were investigated through numerical simulation. A multi-physics model based on thermal-fluid-solid coupling was developed to reveal the internal flow characteristics of the molten pool and its impact on WC particle motion. The results indicate that Marangoni convection is the dominant factor influencing molten pool flow, with its flow velocity varying according to the temperature gradient and laser spot size. Different processing parameters significantly affect the motion patterns and final distribution of WC particles. Smaller spot sizes or lower line energy densities result in localized particle accumulation, whereas moderate spot sizes and line energy densities contribute to the uniform deposition of reinforcement particles. By optimizing processing parameters, two distribution strategies as shallow-layer uniform distribution and deep-layer uniform distribution are proposed to achieve stable and homogeneous particle dispersion at different depths.更多还原