Experimental Study on Fretting Wear Behaviors of H62 Brass under Prestressed Conditions

The fretting wear behavior of H62 brass against GCr15 steel under prestressed conditions was studied using a self-developed fretting wear device in this study. The effects of normal loads, prestresses, fretting frequencies, and fretting movement amplitudes were studied. Simultaneously, the changes in the coefficient of friction, depth of the wear scar, surface morphologies of the wear scar, and wear mechanisms were analyzed. Experimental results showed that the coefficient of friction decreased as the normal loads and prestresses increased and increased as the fretting frequencies and fretting movement amplitudes increased. The depth of the wear scars clearly increased as the normal loads and prestresses increased and decreased as the fretting movement amplitudes increased. The oxygen contents slightly increased in the annular area of the wear scars. The main wear mechanisms of H62 brass against GCr15 under different fretting parameters used in this study were abrasive wear, adhesion wear, and local spalling.