Effects of rare earth elements Ce and Y on high temperature oxidation behavior of JG4246A alloy

doi:10.13251/j.issn.0254-6051.2023.05.013

Abstract

Abstract: In the secondary generation superalloy JG4246A, rare earth elements Ce and Y were added to obtain four kinds of tested alloy ingots with addition of 0.012Ce (mass fraction, %, the same below), 0.017Ce, 0.034Y and 0.061Y, respectively. The effects of Ce and Y on high temperature oxidation resistance of these alloys at 1100 ℃ were studied. The phase composition and the morphology of oxidized surface were analyzed by means of X-ray diffractometer (XRD) and scanning electron microscope (SEM). The results indicate that the oxidation mass gain of the JG4246A alloy can be reduced by adding rare earth elements during the isothermal oxidation process at 1100 ℃ in air, and the oxidation kinetics of the JG4246A alloys conforms to parabolic law. Compared to the rare earth element Y, Ce has a more significant effect on slowing down the high temperature oxidation rate of the JG4246A alloy. The addition of rare earth elements does not change the surface morphology of the oxide film, but the spinel oxide makes the oxide film more compact, which can inhibit the outward diffusion of cations and reduce the oxidation reaction rate, thus improving the oxidation resistance at high temperature.

Key words: rare earth element, JG4246A alloy, isothermal oxidation, oxidation kinetics

CLC Number:

TG132.3

Chen Chonglin, Wang Jun'an, Yu Jianbo, Tu Yuguo, Zhang Meng, Li Mengli. Effects of rare earth elements Ce and Y on high temperature oxidation behavior of JG4246A alloy[J]. Heat Treatment of Metals, 2023, 48(5): 78-82.

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