High Cycle Fatigue Performance of Bare 300M Steel by Self-Heating Tests Under Cyclic Loadings

Abstract

300M, an ultra-high strength steel used in aeronautics for landing gears, is generally shot-peened and coated with High Velocity Oxygen Fuel sprayed WC-10Co-4Cr to improve corrosion resistance and tribological behavior. In the literature, few process parameters have been tested to characterize the effect of surface integrity on fatigue properties. The self-heating method under cyclic loadings is used to quickly determine fatigue properties by coupling the fatigue mechanisms with dissipation mechanisms. This paper focusses on the methodology and results obtained on bare 300M.After implanting and validating a test and post-processing protocol, a self-heating model has been applied. The model shows a good description of the self-heating curve and a great correlation with conventional fatigue data. Mean properties as its scattering have been determined by self-heating tests. Then, geometric and loading parameters have been tested, such as the loading ratio and the coupon volume, showing various influence on self-heating curves.