抄録
Liquid droplet impingement erosion is caused by high-speed droplet attack in a steam flow. The objective of present study is to develop a model to predict the phenomena of liquid droplet impingement erosion based on the mechanism of material damage. In the case of 15Cr martensite stainless steel, it is considered that erosion progresses due to minute fatigue crack growth by the repetition of droplet collision and the erosion pit formation accompanied by the fragment peeling. We developed a model concerning erosion behavior based on such mechanism by making use of the relations of stress generated by droplet collision and fatigue crack growth rate. Here, we presumed that the stress generated by droplet collision correlated with the pit depth and erosion deceased with the depth. The calculated results by the model showed that erosion speed decreased with time and converged to the constant value, which was in good agreement with the tendency of test data.
