Effect of B and Cr on the high temperature oxidation behaviour of novel γ/γ′-strengthened Co-base superalloys,10.1016/j.corsci.2011.04.020,Corrosion S

Effect of B and Cr on the high temperature oxidation behaviour of novel γ/γ′-strengthened Co-base superalloys


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Isothermal oxidation was carried out on new γ/γ′-strengthened Co-base superalloys of the system Co–Al–W–B and Co–Al–W–B–Cr at 800 and 900°C in air. ToF-SIMS investigations show that boron accumulates in the inner oxide layer which improves the oxidation behaviour and oxide layer adhesion considerably. B-rich precipitations can be observed in the alloy matrix, as well. Appropriate amounts of chromium as additional alloying element lead to further improvement of the oxidation resistance due to the formation of protective inner Al2O3 and Cr2O3 scales.

Journal: Corrosion Science - CORROS SCI , vol. 53, no. 9, pp. 2713-2720, 2011

DOI: 10.1016/j.corsci.2011.04.020

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Effect of B and Cr on the high temperature oxidation behaviour of novel γ/γ′-strengthened Co-base superalloys,10.1016/j.corsci.2011.04.020,Corrosion S

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