Research On The Surface Oxidation Behavior Of P92Steel Under Steam And External Load

It is significant to inhibit and avoid the surface oxidation of materials used in the main steam pipe and water wall and so on. In present thesis, experimental study has been carried out to study surface oxidation behavior of P92steel in the condition of the applied loading, shot peening and coupling condition in high temperature steam environment. The main works and the conclusions are as follows:1. The surface oxidation experiments of P92steel with applied tensile loading have been conducted in600℃water vapor environment. The results show that the effect of applied loading on the oxidation rate is not obvious in the initial oxidation, however, with the increasing of oxidation time, the oxidation rate is increased significantly with applied loading.2. The effect of shot-peening treatment on oxidation behavior of P92steel has been done in600℃water vapor environment. The results show that the shot-peening significantly reduces the oxidation rate, with the increasing of the shot-peening air pressure, the oxidation resistance is increasing. Furthermore, there is an optimized surface treatment parameter to suppress surface oxidation.3. The combined effects of shot-peening treatment and applied loading are studied for the P92steel in600℃water vapor environment. The results show that100MPa external load reduces the oxidation rate compared with the results of no external load situation with the same shot-peening parameter, which is opposite to the trend of the effect of external load on the untreated sample.4. Theoretical modified models which describe the effect of the external load and the shot-peening treatment on the surface oxidation are established. The prediction models are in good agreement with the experimental results.