目的 研究不同超音速火焰喷涂条件下WC-12Co粒子在45^#碳钢基体上的沉积变形行为。方法 基于Johnson-Cook塑性材料模型与Thermal-Isotropy-Phase-Change热材料模型，采用LS-DYNA进行建模分析。结果 不同喷涂参数下，WC-12Co粒子在45^#碳钢基体上的沉积行为存在明显差异。沉积过程中，粒子等效塑性应变幅度高于基体;粒子边缘位置等效塑性应变幅度高于粒子中心轴线位置;粒子初始速度与初始温度的增加有助于提升结合界面温度与粒子扁平化程度;粒子初始温度与粒子初始速度对接触界面能量变化影响程度基本一致，单位粒子初始速度与温度提升的能量贡献比 分别为0.78以及0.76，二者的能量贡献比近似相同;适度的基体预热( =500 K)可以促进粒子变形，加深沉积坑深度，增大粒子与基体的结合面积，有助于提升粒子与基体之间的结合强度。基体过冷( =300 K)将导致粒子“翘曲”，降低粒子与基体之间的结合面积，基体过热( =600 K)将导致二者结合处于不稳定状态，易引起粒子剥落，二者均不利于粒子与基体的有效结合。结论 一定范围内提升粒子初始速度、温度与基体初始温度，可以提高粒子扁平化程度，增大粒子与基体结合面积，提升粒子与基体的结合性能，进一步提高涂层质量。

The work aims to study the deposition deformation behavior of WC-12Co particles on 45# carbon steel substrate under different spraying conditions. Based on Johnson-cook plastic material model and Thermal-Isotropy-Phase-Change model, LS-DYNA was used for modeling and analysis. The deposition behavior of WC-12Co particle on 45# carbon steel substrate was obviously different under different spraying parameters. During deposition, the equivalent plastic strain amplitude of particles was higher than that of substrate. The equivalent plastic strain amplitude of particle edge was higher than that of particle central axis. The increase of the initial velocity and temperature of particle was helpful to improve the temperature and flattening degree of the interface of contact region. The influence of initial temperature and velocity of particles on that energy change of contact interface was basically consistent. The energy contribution ratio of the initial velocity and temperature of unit particle to the temperature rise was 0.78 and 0.76 respectively, which was approximately the same. The moderate preheating of substrate could promote the deformation of particles, deepen the depth of deposition crater, increase the bonding area between particle and substrate, and improve the bonding strength between particles and substrate. Super-cooling of the substrate led to the “warping” of particles, reduce the bonding area between particles and substrate, and the overheating of the substrate led to the unstable state of the combination, which was easy to cause particle peeling off and was not conducive to the effective combination of particles and substrate. In a certain range, increasing the initial velocity and temperature of the particles and the initial temperature of the substrate can improve the flattening degree of the particles, increase the bonding area between the particles and the substrate, and enhance the bonding performance between the particles and the substrate, thus further improving the coating quality.