Abstract：The oxygen partial pressure at high temperature for six different water conditions has been calculated and compared with the thermal calculation method. It is obtained that the critical oxygen partial pressure at 570℃ are 1.0E-15 for both TP347H and T91 materials, at which it occurs the transformation of high temperature oxidation products. However, the calculated oxygen partial pressure for water conditions OT(1), pure water and AVT(R1) at this temperature are all higher than 1.0E-10, and then it can conclude that the normal water conditions such as adding oxygen conditions and reductive total volatilization treatment conditions should have the similar thermal controlling effect on the high temperature oxidation products for materials TP347H and T91. The type of oxidation products vary as the content of the alloying elements change. The volume fraction of dense Cr2O3 in the skin layer would increase as the content of Cr increases. For the new Fe-18Ni-25Cr-xAl material, as the content of Al increases, the mass fraction of (Fe,Cr,Al)2O3 increases. Furthermore, it found that Al2O3 would form in the skin layer as the Al content is higher than 3%, and then it can have better effect on high temperature oxidation protection.
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2021, Vol. 28 