Effect of impact angle on the slurry erosion-corrosion of Stellite 6 and SS316

• Effect of impact angle on Stellite 6 and SS316 investigated at 20, 45, 60 and 90°.
• Lost Wax and Sand Cast Stellite 6 presented similar erosion-corrosion resistance.
• Stellite 6 had greater erosion-corrosion resistance over SS316.
• SS316 had a more ductile response to angle of impact compared with Stellite 6.
• Maximum mass loss SS316: 45°; Maximum mass loss both Stellite 6 casts: 60°.

This study is an investigation of the effect of impingement angle on slurry erosion-corrosion of Stellite 6 manufactured by sand casting, lost wax casting and SS316. The tests were performed using an impingement rig in which a slurry with 3.5% NaCl and 1.177 g/l suspended angular sand particles at 19 m/s were recirculated for 1 h. The results were obtained for angles of 20°, 45°, 60° and 90° to the exposed surface. Post-experimental analysis using light microscopy, surface profiling and SEM assisted with clarification of the wear mechanisms and assessment of the severity of surface damage. Stellite 6 consistently exhibited superior wear resistance compared with SS316. The most severe regime for SS316 was experienced at low angle of impingement, 45°, due to its ductility. Alternatively, the brittle network of chromium carbides showed significant impact on the behavior of cast Stellite 6 under solid-liquid impingement with the most critical erosion-corrosion damage occurring at 60°.