Corrosion Behavior of Designed Ferritic-martensitic Steels in Supercritical Water.

摘要

As the Supercritical Water-cooled Reactor (SCWR) shows a promising future, the corrosion behavior of candidate materials has attracted great interest. In this study, experimental investigation was conducted to evaluate the corrosion behavior of the ferritic-martensitic steels designed for the use in SCWR. The steels were evaluated in supercritical water (SCW) with different dissolved oxygen concentrations at 500°C and 25MPa for up to 1000 hours. The effects of alloy elements, temperature, and dissolved oxygen concentration on the corrosion behavior of the ferritic-martensitic steels in SCW have been investigated. It was found that adding Si in alloy increased the corrosion resistance, whereas the addition of Mn showed the converse effect. Higher dissolved oxygen concentration accelerated the corrosion in SCW and decreased the effects of Si and Mn. Ultrasonic peening was also investigated to evaluate its effect on the corrosion in SCW. Significant improved corrosion resistance could be achieved by ultrasonic peening treatment.