Study the Wear and Friction of Free Cutting Brass under Dry Sliding Condition

Abstract

This research is devoted to study the wear resistance, coefficient of friction and contact temperature of free cutting brass under dry sliding wear conditions over steel counterface disc using pin-on-disc technique. Five load values 3.5, 7, 11, 15 and 20 N were used at constant sliding speed 10.4458 m.s-1 and time 30 min. An increase in wear rate and surface damage of brass specimens was observed by increasing the applied load and a transition from mild to severe wear was occurred at 11 N. A plastic deformation phenomena at macroscopical scale when applying 20 N was detected at the contact surfaces of the brass specimens. The average of the measured contact temperatures of brass was increased from 94 to 268 oC by increasing the applied load from 3.5 to 20 N, while the smallest and greatest calculated kinetic friction coefficient for the sliding pair( free cutting brass / steel) was 0.49 and 0.67 at applied loads 7 and 20 N respectively. Furthermore, an important observations were revealed which includes oxidation and dezincification of the wear rate and contact temperature measuring specimens respectively at their external surface contacting the iron housing far from their contact surfaces with steel disc at 20 N applied load.