Cyclic oxidation testing of P91 in low velocity burner rigs

Low velocity burner rigs have been used to perform cyclic oxidation tests. Due to the nature of the equipment there are limitations on the cycle frequency that can be used and there are also several other parameters that must be defined. The importance of these parameters on metal wastage in the martensitic steel, P91 has been investigated. Salt deposition rates are independent of fuel and salt composition under the conditions investigated. However the observed metal wastage in the martensitic steel P91 is influenced both by the fuel and salt compositions. Intermittent washing of the specimens has little influence whilst the corrosion product remains intact but causes additional loss of corrosion product after spallation has been initiated.