Abstract
Abstract Duplex stainless steels (DSS) are used in a wide range of industries, predominantly because of the high strength and corrosion resistance they possess. ASTM A890 grade 7A is the newest addition to the family of duplex stainless steels with a unique composition having small amount of rare earth elements. This work is aimed at comparing the sliding wear behaviour of commercially used 5A, 6A and recently developed 7A grades of duplex stainless steel at high sliding velocities. The wear tests were conducted on pin-on-disk apparatus at varying load conditions. Three-dimensional surface analysis of the three grades were conducted using a 3D profilometer to study and compare the roughness of the worn surfaces. Weight loss method used to determine the material removal showed the highest weight loss for grade 5A followed by that of 6A and 7A grades. Grade 7A showed a large reduction in wear volume compared to the other grades. 3D profilometer studies of the worn surface at a load of 60N showed slight plastic deformation in all three grades. Grade 7A showed lower roughness also compared to previous grades
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