Effect of Fluid Velocity on Erosion-Corrosion of Dual Phase CK45 Steel

Erosion-corrosion usually occurs in the petrochemical, oil and gas industry and marine structures. Therefore, it is important to study the factors affecting. The severity of damage depends on various factors such as fluid velocity and microstructure of the material. The objective of this paper is to experimentally investigate the effect of fluid velocity on the erosion-corrosion of dual phase samples of Ck45. These were achieved by austenitising of samples at 740 oC for 45 min and then cooling in air, or quenching in water and/or austempering at 400 oC in salt bath for two hours. Erosion-corrosion tests were carried out in slurry composed of distilled water, 3 wt% NaCl and 1 wt% of alumina particles in flow velocities of 5, 9 and 16 m/s. The results revealed that the kinetic of erosioncorrosion was a linear. By increasing the velocity from 5 m/s to 16 m/s, the line slope is increased by a factor of 4-6, depending on the microstructures of samples. The erosion-corrosion rate increased by increasing velocity in accordance with a power relationship. The amount of power varied from 2 up to 3.