Impact Angle and Particle Velocity Effects on Erosion of Duplex Stainless Steel Containing Martensite and Ferrite

Abstract

In this work, duplex stainless steel containing lath martensite and ferrite was impinged with a range of impact angles (15-90°) and a range of particle velocities (65.4, 83.2 and 98.7m/s) to investigate the erosion rate and erosion behavior. The results indicate that cutting is the dominated mode for material removal at oblique impact angle. In this case, the morphology of the surface damage is long and shallow cutting grooves. At the higher impact angle, the mode is based on extrusion and cracking. However, at the medium impact angle, the wear is dominated by transition of mode mixed with cutting and extrusions. The maximum erosion rate occurs at the angle of 45° because the equal of resolved shear stress and resolved normal stress appropriate taking away force to remove the material. The erosion rates increase with increasing particle velocity for all impact angles but the increment is decreased with increasing impact angles. At oblique impact angle, the cutting action of the abrasive is enhanced and therefore the efficiency of material removal increases with increasing impact energy. On the other hand, at high impact angle the wear mode of extrusion becomes more obvious. The fracture surfaces are flattened or plastic deformed by successive particle impact. Highly deformed material causes that the material pieces can be taken away more difficult. As a consequence, the increment in erosion rate decreases.