한국주조공학회

To elucidate the characteristics of cavitation erosion of super duplex stainless steel, a cavitation erosion test, an optical microstructure, a hardness test, and a transmission electron microscope (TEM) analysis were conducted. As aging time at 475oC increased, the hardness of ferrite phase increased whereas that of austenite phase was nearly constant. The reason why the cavitation erosion resistance increased with an increase of aging time was due to the formation of W-rich phases (α’) of a nanometer scale with the high hardness that were precipitated within α-grains and at α-grain boundaries during aging, compared with that of the solution annealed alloy.

Cavitation erosion, Duplex stainless steel, W-enriched phase, Precipitation, Mean depth of penetration.