STUDY OF HOT CORROSION RESISTANCES OF TWO NICKEL BASE SUPERALLOYS FOR DIRECTIONAL SOLIDIFICATION

J Chin Soc Corr Pro

2008, Vol. 28

Issue (5): 277-281 DOI:

Research Articles

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STUDY OF HOT CORROSION RESISTANCES OF TWO NICKEL BASE SUPERALLOYS FOR DIRECTIONAL SOLIDIFICATION

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大连理工大学；沈阳金属研究所联合培养

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Abstract Hot corrosions of a new nickel base superalloy DZ68 and DZ38G for directional solidification in the present of molten salt of 75% Na2SO4 + 25% NaCl in air at 900℃ were studied. The results showed that DZ68 had a more homogeneous microstructure by controlling segregation during solidification, So the hot corrosion of DZ68 was uniform and the oxide layer of DZ68 was much deeper. DZ38G had a small number of eutectic after heat treatment, its microstructure was non-uniform. The material loss of DZ38 was predominant by removal of oxide scale and severe corrosion pitting occurred in the DZ38G. The hot corrosions of DZ68 and DZ38G were the typeⅠ, but the processes of their hot corrosion were different for which they had different corrosion productions and microstructures. The all results account for the resistance of DZ68 is better than DZ38G even if the chromium content of DZ68 is lower than DZ38G.

Key words: hot corrosion low segregation microstructure

Received: 24 October 2006

ZTFLH:

TG172.62

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;. STUDY OF HOT CORROSION RESISTANCES OF TWO NICKEL BASE SUPERALLOYS FOR DIRECTIONAL SOLIDIFICATION. J Chin Soc Corr Pro, 2008, 28(5): 277-281 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2008/V28/I5/277

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