MODELING THE INFLUENCE OF SURFACE OXIDATION ON HIGH-TEMPERATURE EROSION

The interaction between a growing surface oxide and impacting particle s is of importance in many high temperature applications such as gas t urbines and combined cycle power generation systems and may often resu lt in accelerated rates of metal wastage. In this paper the interactio n between a growing oxide him and an impacting particle is considered. The impact conditions are analysed to predict the impact damage morph ology and the importance of parameters such as oxidation rate, oxide m echanical properties, impact velocity and particle size and distributi on, highlighted. The analysis has been used to extend the range of app lication of predictive erosion models using a Monte Carlo simulation a pproach. The modelling has been used to produce high temperature erosi on mechanism maps which define the conditions over which a particular material removal mechanism will predominate. For many of the high temp erature erosion conditions encountered in practice, this modelling app roach suggests that several material removal mechanisms may co-exist l ocally across a surface and it is therefore essential that these facto rs are included when life-prediction models are developed.