Steam turbine blades are damaged by water erosion due to the action of steam condensate during operation. Embedding Stellite alloy is a general method to resist water erosion. In this paper

the influence of water droplet speed and size on water erosion of Stellite alloy is studied by numerical calculation. The results show that

the velocity and size of water droplets have a significant effect on the stress of Stellite alloy. With the increase of water droplet collision velocity

the maximum equivalent stress in Stellite alloy increases. When the velocity exceeds 293 m/s

the maximum equivalent stress is greater than the yield strength

and higher secondary stress is produced. With the increase of water droplet size

the maximum equivalent stress increases significantly and exceeds the yield strength of Stellite

but when the water droplet radius exceeds 750 μm

the maximum equivalent stress is basically unchanged. Large water droplets split into smaller water droplets in the process of high-speed collision

and continue to collide with Stellite alloy

resulting in secondary stress that is higher than the fatigue limit of Stellite alloy. The higher the impact velocity and water droplet diameter

the greater the number of secondary stress peaks above the fatigue limit

which will accelerate the fatigue damage of Stellite alloy.