Effect of Fast Multiple Rotation Rolling on the Oxidation Resistance of Super304H Stainless Steel in High-Temperature Water Vapor

摘要

In this project, Super304H stainless steel was subjected to fast multiple rotation rolling (FMRR) and a refined nano-structured surface layer was fabricated after the FMRR treatment. The morphology and microstructure of the refined layer were observed by optical microscopy and X-ray diffraction. Then the oxidation behavior of the stainless steel with and without FMRR treatment was investigated in the temperature range of 550-750 degrees C for 25 h in water vapor environment. The compositions and microstructures of the oxide scales were characterized by SEM and EDX. Severe plastic deformation was observed in the refined layer and the grain size on the surface was found to decline gradually with increasing treatment pressure, which led to higher Cr content in the refined layer and thinner thickness of the oxide scales when compared with the untreated sample. Super304H stainless steel was found to exhibit improved oxidation resistance in high temperature water vapor after the FMRR treatment.