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The effect of sulphur on the cyclic oxidation of Ni-based superalloy GTD-111 was investigated. A cyclic oxidation experiment was performed for up to 200 cycles of 1h exposure at 1100°C. Even at the initial stage of 15 cycles, porosity increased with increasing sulphur content. The formation of pores along Cr2O3 layer grain boundaries was particularly pronounced. Increased porosity leads to an increase...
The effect of the addition of less than 1wt% of Al, Si and Mn on the cyclic oxidation of the Ni–22Cr–14W–2Mo alloy is investigated. The cyclic oxidation experiment is performed between 1150°C and 400°C. Al and Si addition reduced the oxidation rate by suppressing the formation of transient oxides. In particular, Al enhanced the adhesion of the oxide scale by forming oxide pegs and a (Cr,Al) 2...
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