EFFECT OF SURFACE ORIENTATION ON OXIDATION BEHAVIOR OF DIRECTIONALLY SOLIDIFIED IC-6 ALLOY

J Chin Soc Corr Pro

1998, Vol. 18

Issue (4): 276-282 DOI:

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EFFECT OF SURFACE ORIENTATION ON OXIDATION BEHAVIOR OF DIRECTIONALLY SOLIDIFIED IC-6 ALLOY

YUAN Fu-he LI Tie-fan CHEN Jiang (State Key Laboratory of Corrosion and Protection of Metals;Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015)

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Abstract Effects of surface orientation on the isothermal and cyclic oxidation behavior of directionally solidified IC-6 alloy were studied by means of TGA, SEM/EDAX and SEM/EPMA. The longitudinal specimens are less resistant than transverse specimens with respect to isothermal oxidation at 950℃ and 1050℃ for 100 hours. It is claimed that grain boundaries intersecting the surface of transverse specimen facilitate short cut diffusion of Al atoms in the substrate to assist Al2O3 nucleation and growth on the surface. On the contrary, transverse specimens show poor cyclic oxidation resistance in comparison with longitudinal specimens due to the easiness of Al2O3 spallation upon temperature fluctuation. The contribution of lattice diffusion grows with temperature so that both specimens have the same disastrous weight loss rate when cyclically oxidized at 1100℃.

Key words: IC-6 alloy Oxidation Surface orientation Directional solidification Grain boundary

Received: 25 August 1998

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YUAN Fu-he LI Tie-fan CHEN Jiang (State Key Laboratory of Corrosion and Protection of Metals;Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015). EFFECT OF SURFACE ORIENTATION ON OXIDATION BEHAVIOR OF DIRECTIONALLY SOLIDIFIED IC-6 ALLOY. J Chin Soc Corr Pro, 1998, 18(4): 276-282.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I4/276

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