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Abstract Cyclic oxidation resistance of four home-made superalloys (211, 208, GH-37 and M-38) has been investigated at 900, 950, 1000, 1050 and 1100℃.Specimens were subjected to 200 thermal cycles, each of which consists of 1 hr heating followed by 10 min air cooling. Thermogravimetric measurements at lower temperatures showed linear weight gain with time. However, at temperatures above 1000℃ , weight loss following a short period of initial weight gain was observed due to severe spallation of the oxide scales. The logarithm of the amount of spallation increases linearly with oxidation temperature. Metallographic examination reveals the formation of the zone of depletion in certain alloying elements (Cr, Al, etc,). In the case of M-38 and GH-37 linear relationship between the logarithm of depth of the depletion zone and temperature was found.
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Received: 25 April 1983
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