Competitive oxidation behavior of Ni-based superalloy GH4738 at extreme temperature

Abstract

A high thrust-to-weight ratio poses challenges to the high-temperature performance of Ni-based superalloys. The oxidation behavior of GH4738 at extreme temperatures has been investigated by isothermal and non-isothermal experiments. As a result of the competitive diffusion of alloying elements, the oxide scale included an outermost porous oxide layer (OOL), an inner relatively dense oxide layer (IOL), and an internal oxide zone (IOZ), depending on the temperature and time. A high temperature led to the formation of large voids at the IOL/IOZ interface. At 1200°C, the continuity of the Cr-rich oxide layer in the IOL was destroyed, and thus, spallation occurred. Extension of oxidation time contributed to the size of Al-rich oxide particles with the increase in the IOZ. Based on this finding, the oxidation kinetics of GH4738 was discussed, and the corresponding oxidation behavior at 900–1100°C was predicted.

Keywords

Ni-based superalloy GH4738 / extreme temperature / competitive oxidation / oxidation mechanism / oxidation kinetics

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