The role of normal force on the fretting corrosion behaviour of alloy 690 TT tube against 410 stainless steel plate in high temperature high pressure water

The effect of normal force on fretting corrosion of Alloy 690 TT tube in high temperature high pressure water was investigated. Increasing the normal force accelerates the wear behaviour of the tube. The small normal force has a larger coefficient of friction. The wear mechanism changes from the dominant form of abrasive wear to delamination wear. The increase in normal force not only causes the wear debris layer (WDL) and the tribologically transformed structure to become thicker and more refined, but also affects the oxidation and corrosion behaviour of the tube and changes the composition of the WDL.