Abstract:In gas atomization, the broken droplets usually experience a short flight before their solidification. The flying process of a wear and corrosion resistant FeNiCrSiMoMnC alloy designed for the laser cladding coatings under heavy-duty condition is studied in this work. By a model established based on this process and numerical simulation, the influence of the initial gas velocity and droplet diameter on droplet velocity and heat transfer coefficient was investigated. The result shows that the fused droplet velocity increases with the flight distance at the first stage and then decreases gradually, and the maximum droplet velocity points decrease with the incremental of droplet diameter. On the contrary, the heat transfer coefficient declines sharply before it rises, the minimum value is 2k_g/d. An increasing droplet diameter leads to a smaller velocity difference between the droplet and gas, thus a smaller heat transfer coefficient. The maximum droplet velocity moves up along with the initial gas velocity, at the same time, the heat transfer coefficient also increases.