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.

摘要

研究了不同拉伸应力条件下的铁素体-马氏体钢P92在600°C的超临界水中长达1000 h的氧化行为。结果表明，氧化速率随拉伸应力的增加而增加。具有30MPa的拉伸应力的氧化皮的厚度是没有应力时的氧化皮的厚度的约1.22倍，而在60MPa下观察到的氧化皮的厚度与0MPa下的氧化皮的厚度的比是1.73倍。外层和内层的厚度比随着拉伸应力的增加而增加。在所有情况下都会产生裂纹，并受拉伸载荷的影响。此外，扩散层的厚度随着拉伸应力的增加而增加。本文讨论了相关机制。