Abstract
Creep rupture tests were conducted at 800°C in a hot corrosive environment for nine kinds of representative nickel-base superalloys and three kinds of their plasma spray coating systems with or without a ceramic top coat. The effect of hot corrosion on the creep performances were investigated in some detail. Different superalloys were classified into three groups according to the significance of the corrosion-induced creep rupture strength degradation along with a corrosion-induced change in the fracture behavior. Aspects of the materials affecting the corrosion-creep performances have been discussed. Furthermore the characteristic nature of damage to the coating systems has been demonstrated.
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