q620c高強板在英文中的表現性能 expelled from the fretting contact was not affected by the fretting frequency. Examination of worn specimens using SEM and EBSD was conducted to characterise the formation of TTS and to allow its role in the development of wear to be understood. It was found that at low frequencies, the fretting scar consisted of an oxide debris bed on top of a largely q620c高強板undeformed martensite sub-structure. However, at higher frequencies, the appearance of the sub-surface worn damage layer was very different, consisting of a debris oxide, a severely damaged/fragmented metallic layer and a plastically deformed martensitic sub-structure. A phenomenological model is presented (based upon the basic physical processes of oxide formation at the fretting surface and subsurface deformation below the contact)t is well established that damage q620c高強板to the first bodies in fretting wear gives rise to a hard and brittle tribologically transformed structure (TTS) which can influence both wear and fatigue. While the existence and significance of TTS has been established through extensive study, the underlying physical mechanisms of its formation and their dependence on fretting conditions are still not clear. The aim of this work is to investigate the role of frequency in the evolution of tribolog