Investigation on fretting wear behavior of 2.25Cr–1Mo tube in water at various temperatures

Abstract

Heat transfer tubes are subjected to cyclic and direct contact under high temperature liquid conditions due to flow-induced vibration. The influence of water temperatures (25, 60, and 95 °C) and loads (10, 20, and 30 N) on the fretting wear behavior of 2.25Cr–1Mo tube against Gr5C12 rod was investigated. Results indicate that the fretting regime changes from gross slip to partial slip as the load increases from 10 N to 30 N. The fretting regime remains unchanged as the water temperature increases from 25 °C to 95 °C. The fretting regime is more related to load than water temperature, implying that the water temperature and load play different roles in the fretting wear process. The coefficient of friction (COF), wear morphology, wear volume, and wear rate show an evident dependence on load and water temperature, while the COF has a significant relationship with the load. The effect of micro-pitting may be ignored due to the material removal from the original surface and formation of wear debris layer (WDL) in the gross slip regime.