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Abstract The kineties on hot corrosion of four Ni-base superalloys, two sheets(GH-30 and GH-128 ) and two cast alloys ( M-38 and K_3 ) , were studied at900℃ by salt coat method. Results showed that hot corrosion process for the more resistant M-38 and GH-30 alloys can be divided into three stages—ineubation, extension and acceleration period, while that of the less resistant GH-128 and K_3 alloys can be divided into two stages—incubation and acceleration period. GH-128 and K_3 alloys have high Mo and W contents, so that hot corrosion is governed by acid fusion. The hot corrosion of M-38 and GH-30 alloys,on the other hand, is governed by a sulfidation—oxidation processes alonggrain boundaries. The penetration of the sheet having fine grain and homogenous composition is less serious than that of the cast alloys which are coarsegrained with a high extent of segregation. Both weight loss and depth of penetration must he employed for the evaluation of hot corrosion resistance of the latter alloys.
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Received: 25 April 1984
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