Effects of tensile stress on oxidation behavior of a Ferrite-martensite steel in supercritical water

Abstract

ABSTRACT The oxidation behaviour of ferritic-martensitic steel P92 with different tensile stress conditions has been investigated in supercritical water at 600°C for up to 1000 h. The results indicated that the oxidation rate increased with an increase in tensile stress. The thickness of the oxide scale with atensile stress of 30 MPa is about 1.22 times greater to that at without stress, while the ratio of the thickness of oxide scale to that observed at 60 MPa is 1.73 times greater to that at 0 MPa. The thickness ratio of the outer and inner layer increased with the increasing tensile stress. Crack develops in all cases and is affected by the tensile loading. Furthermore, the thickness of the diffusion layer increased with an increase in tensile stress. The related mechanism has been discussed in this paper.